BS EN 62020:1999:2006 Edition
$165.47
Electrical accessories. Residual current monitors for household and similar uses (RCMs)
| Published By | Publication Date | Number of Pages |
| BSI | 2006 | 82 |
Specification for residual current monitors designed to monitor electrical installations or circuits for the presence of unbalanced earth fault currents.
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| 1 | BRITISH STANDARD BS EN 62020:1999 IEC 62020:1998 Electrical accessories – Residual current monitors for household and similar uses (RCMs) The European Standard EN 62020:1998, with the incorporation of amendment A1:2005, has the status of a British Standard ICS 29.120.50 |
| 2 | This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee was published under the authority of the Standards Committee and comes into effect on 15 January 1999 National foreword This British Standard is the official English language version of EN 62020:1998 including amendment A1:2005. It is identical with IEC 62020:1998, including amendment 1:2003. The start and finish of text introduced or altered by amendment is indicated in the text by tags !”. Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by !”. The CENELEC common modifications have been implemented at the appropriate places in the text. The start and finish of each commo… The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/5, Indentation hardness testing, which has the responsibility to: – aid enquirers to understand the text; – present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; – monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BS… This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 79 and a back cover. |
| 3 | EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 62020 + A1 May 2005 ICS 29.120.50 Descriptors: Electrical household accessory, low-voltage equipment, residual current monitor, definition, characteristics, construction, tests English version Electrical accessories Residual current monitors for household and similar uses (RCMs) (includes amendment A1:2005) (IEC 62020:1998 + A1:2003) This European Standard was approved by CENELEC on 1998-10-01. amendment A1 was approved by CENELEC on 2005-03-01. CENELEC member… Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by tran… CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finl… CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1998 CENELEC – All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62020:1998 + A1:2005 E |
| 4 | The text of document 23E/337/FDIS, future edition 1 of IEC 62020, prepared by SC 23E, Circuit-breakers and similar equipment for… The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 62020:1998 was approved by CENELEC as a European Standard without any modification. Foreword to amendment A1 The text of document 23E/531/FDIS, future amendment 1 to IEC 62020:1998, was prepared by SC 23E, Circuit-breakers and similar eq… A draft amendment, aiming to improve subclause 8.18.1 of EN 62020:1998, prepared by the Technical Committee CENELEC TC 23E, Circ… The following dates were fixed: Annex ZB has been added by CENELEC. Endorsement notice The text of amendment 1:2003 to the International Standard IEC 62020:1998 was approved by CENELEC as an amendment to the European Standard with agreed common modifications. |
| 5 | Contents |
| 9 | Introduction The purpose of a residual current monitor (hereinafter referred to as RCM) is to monitor an electrical installation or circuit f… An RCM may be used in conjunction with protective devices (see IEC 60364-4). Installation and application rules are given in IEC 60364. 1 Scope This International Standard applies to residual current monitors having rated voltages not exceeding 440 V a.c. and rated currents not exceeding 125 A for household and similar purposes. These devices are intended to monitor the residual current of the installation and to give a warning if the residual current between a live part and an exposed conductive part or earth exceeds a predetermined level. !RCMs covered by this standard are not intended to be used as protective devices.” RCMs detect residual alternating currents and residual pulsating direct currents whether suddenly applied or slowly rising (see 8.16). This standard applies to monitors performing simultaneously the functions of detection of the residual current, of comparison of… RCMs having internal batteries are not covered by this standard. The requirements of this standard apply for normal environmental conditions (see 7.1). Additional requirements may be necessary for RCMs used in locations having severe environmental conditions. This standard does not cover Insulation Monitoring Devices (IMDs) which are covered by the scope of IEC 61557-8. 2 Normative references The following normative documents contain requirements which, through reference in this text, form an integral part of this Inte… IEC 60038:1983, IEC standard voltages. IEC 60050-101:1998, International Electrotechnical Vocabulary (IEV) – Part 101: Mathematics. IEC 60050(151):1978, International Electrotechnical Vocabulary (IEV) – Chapter 151: Electrical and magnetic devices. IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear and fuses. IEC 60051 (all parts), Direct acting indicating analogue electrical measuring instruments and their accessories. IEC 60068-2-28:1990, Environmental testing – Part 2: Tests – Guidance for damp heat tests. IEC 60068-2-30:1980, Environmental testing – Part 2: Tests – Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle). IEC 60364-4-443:1995, Electrical installations of buildings – Part 4: Protection for safety – Chapter 44: Protection against overvoltages -Section 443: Protection against overvoltages of atmospheric origin or due to switching. |
| 10 | IEC 60364-5-53:1994, Electrical installations of buildings – Part 5: Selection and erection of electrical equipment – Chapter 53: Switchgear and controlgear. IEC 60417-2:1998, Graphical symbols for use on equipment – Part 2: Symbol originals. IEC 60529:1989, Degrees of protection provided by enclosures (IP Code). IEC 60664-1:1992, Insulation coordination for equipment within low-voltage systems – Part 1: Principles, requirements and tests. !IEC 60664-3:2003, Insulation coordination for equipment within low-voltage systems – Part 3: Use of coating, potting or moulding for protection against pollution”. IEC 60695-2-1/0:1994, Fire hazard testing – Part 2: Test methods – Section 1/sheet 0: Glow-wire test methods – General. IEC 60755:1983, General requirements for residual current operated protective devices. IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent protection for household and similar uses (RCCBs) – Part 1: General rules. IEC 61543:1995, Residual current-operated protective devices (RCDs) for household and similar use – Electromagnetic compatibility. IEC 61557-8:1997, Electrical safety in low-voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation monitoring devices for IT systems. ISO/IEC Guide 2:1991, General terms and their definitions concerning standardization and related activities. !CISPR 14-1:2002, Electromagnetic compatibility – Requirements for household appliances, electric tools and similar apparatus – Part 1: Emission”. 3 Definitions For the purpose of this standard, the following definitions apply. Where the terms “voltage” or “current” are used, they imply r.m.s. values, unless otherwise specified. 3.1 Definitions relating to currents flowing from live parts to earth 3.1.1 earth fault current current flowing to earth due to an insulation fault 3.1.2 earth leakage current current flowing from the live parts of the installation to earth in the absence of an insulation fault 3.1.3 pulsating direct current current of pulsating wave form (IEV 101-14-31) which assumes, in each period of the rated power frequency, the value 0 or a value not exceeding 0,006 A d.c. during one single interval of time, expressed in angular measure, of at least 150˚ 3.1.4 current delay angle µ time, expressed in angular measure, by which the starting instant of current conduction is delayed by phase control |
| 11 | 3.2 Definitions relating to the energization of an RCM 3.2.1 energizing quantity electrical excitation quantity which alone, or in combination with other such quantities, shall be applied to a RCM to enable it to accomplish its function under specified conditions 3.2.2 energizing input-quantity energizing quantity by which the RCM is activated when it is applied under specified conditions these conditions may involve, for example, the energizing of certain auxiliary elements 3.2.3 residual current (I%) vector sum of the instantaneous values of the current flowing in the main circuit of the RCM (expressed as r.m.s. value) 3.2.4 residual operating current value of residual current which causes the RCM to operate under specified conditions 3.2.5 residual non-operating current (I%no) value of residual current at which and below which the RCM does not operate under specified conditions 3.3 Definitions relating to the operation and to the functions of residual current monitors 3.3.1 residual current monitor (RCM) device or association of devices which monitors the residual current in an electrical installation, and which activates an alarm when the residual current exceeds the operating value of the device 3.3.2 RCMs functionally independent of line voltage RCMs for which the functions of detection, evaluation and actuation do not depend on the line voltage 3.3.3 RCMs functionally dependent on line voltage RCMs for which the functions of detection, evaluation or actuation depend on the line voltage 3.3.4 limiting non-actuating time maximum delay during which a value of residual current higher than the residual !operating” current can be applied to the RCM without causing it to operate 3.3.5 time-delay RCM RCM specially designed to attain a predetermined value of limiting non-actuating time, corresponding to a given value of residual current 3.3.6 main circuit (of a RCM) all the conductive parts of a RCM included in the current paths (see 4.3) 3.3.7 control and auxiliary circuit (of a RCM) all the conductive parts of a RCM intended to be included in a circuit other than the main circuit of the RCM |
| 12 | 3.3.8 RCM type A RCM for which actuation is ensured for residual sinusoidal alternating currents and residual pulsating direct currents, whether suddenly applied or slowly rising 3.3.9 test device device incorporated in the RCM simulating the residual current conditions for the operation of the RCM under specified conditions 3.3.10 alarm state alarm state indicates that the residual current in the installation monitored has exceeded the preset level of the RCM 3.3.11 non-alarm state non-alarm state indicates that the residual current in the installation monitored is less than the preset level of the RCM 3.3.12 actuating time time taken for an RCM to change from the non-alarm state to the alarm state in response to the sudden appearance of a residual current which exceeds the preset level ! 3.3.13 functional earth connection (FE) electrical connection between RCM and earth which is provided to ensure: 3.3.14 maximum actuating time (Tmax) the maximum actuating time for residual currents greater than or equal to I%n for RCMs with adjustable time delay 3.3.15 minimum non-actuating time (Tmin) the minimum non-actuating time for residual currents greater than or equal to I%n for RCMs with adjustable time delay” 3.4 Definitions relating to values and ranges of energizing quantities 3.4.1 rated value quantity value assigned by the manufacturer for a specific operating condition of a RCM 3.4.2 non-operating overcurrents in the main circuit definitions of limiting values of non-operating overcurrents are given in 3.4.2.1 and 3.4.2.2 3.4.2.1 limiting value of overcurrent in case of a load through a RCM with two current paths maximum value of overcurrent of a load which, in the absence of any fault to frame or to earth, and in the absence of an earth leakage current, can flow through a RCM with two current paths without causing it to operate |
| 13 | 3.4.2.2 limiting value of overcurrent in case of a single-phase load through a RCM maximum value of a single-phase overcurrent which in the absence of any fault to frame or to earth, and in the absence of an earth leakage current, can flow through a RCM without causing it to switch to the alarm state 3.4.3 residual short-circuit withstand current maximum value of the residual current for which the operation of the RCM is ensured under specified conditions and above which the device may undergo irreversible alterations 3.4.4 prospective current current that would flow in the circuit, if each main current path of the RCM and of the overcurrent protective device (if any) were replaced by a conductor of negligible impedance 3.4.5 conditional short-circuit current value of the a.c. component of a prospective current, which a RCM protected by a suitable short-circuit protective device (hereafter referred to as SCPD) in series can withstand under specified conditions of use and behaviour 3.4.6 conditional residual short-circuit current value of the a.c. component of a residual prospective current which a RCM protected by a suitable SCPD in series, can withstand under specified conditions of use and behaviour 3.4.7 I2t (Joule integral) the integral of the square of the current over a given time interval (t0,t1): 3.5 Definitions relating to values and ranges of influencing quantities 3.5.1 influencing quantity any quantity likely to modify the specified operation of a RCM 3.5.2 reference value of an influencing quantity value of an influencing quantity to which the manufacturer’s stated characteristics are referred 3.5.3 reference conditions of influencing quantities collectively, the reference values of all influencing quantities 3.5.4 range of an influencing quantity range of values of an influencing quantity which permits the RCM to operate under specified conditions, the other influencing quantities having their reference values 3.5.5 extreme range of an influencing quantity range of values of an influencing quantity within which the RCM suffers only spontaneously reversible changes, although not necessarily complying with all the requirements of this standard |
| 14 | 3.5.6 ambient air temperature temperature, determined under prescribed conditions of the air surrounding the RCM (for an enclosed RCM it is the air outside the enclosure) 3.6 Definitions relating to terminals 3.6.1 terminal conductive part of a device, provided for reusable electrical connection to external circuits 3.6.2 screw-type terminal terminal for the connection and subsequent disconnection of one conductor or the interconnection of two or more conductors capable of being dismantled, the connections being made, directly or indirectly, by means of screws or nuts of any kind 3.6.3 pillar terminal screw-type terminal in which the conductor is inserted into a hole or cavity, where it is clamped under the shank of the screw(s… 3.6.4 screw terminal screw-type terminal in which the conductor is clamped under the head of the screw. The clamping pressure may be applied directly by the head of the screw or through an intermediate part, such as a washer, a clamping plate or an anti-spread device 3.6.5 stud terminal screw-type terminal in which the conductor is clamped under a nut. The clamping pressure may be applied directly by a suitably shaped nut or through an intermediate part, such as a washer, a clamping plate or an anti-spread device 3.6.6 saddle terminal screw-type terminal in which the conductor is clamped under a saddle by means of two or more screws or nuts 3.6.7 lug terminal screw terminal or a stud terminal, designed for clamping a cable lug or a bar by means of a screw or nut 3.6.8 screwless terminal connecting terminal for the connection and subsequent disconnection of one conductor or the dismountable interconnection of two … 3.6.9 tapping screw screw manufactured from a material having high resistance to deformation, when applied by rotary insertion to a hole in a materi… |
| 15 | 3.6.10 thread forming screw tapping screw having an uninterrupted thread; it is not a function of this thread to remove material from the hole 3.6.11 thread cutting screw tapping screw having an interrupted thread; it is a function of this thread to remove material from the hole 3.7 Conditions of operation 3.7.1 operation alteration of the state of the RCM from the non-alarm state to the alarm state or vice versa 3.7.2 clearance (see Annex B) shortest distance in air between two conductive parts 3.7.3 creepage distance (see Annex B) shortest distance along the surface of an insulating material between two conductive parts 3.8 Test 3.8.1 type test test of one or more devices made to a certain design to show that the design meets certain requirements 3.8.2 routine tests test to which each individual device is subjected during and/or after manufacture to ascertain whether it complies with certain criteria 4 Classification RCMs are classified: 4.1 According to the method of operation 4.1.1 RCM functionally dependent on line voltage 4.1.2 RCM functionally dependent on an energy source other than line voltage 4.2 According to the type of installation 4.3 According to the number of current paths |
| 16 | 4.4 According to the ability to adjust the residual operating current 4.5 According to the possibility of adjusting the time-delay 4.6 According to the protection against external influences 4.7 According to the method of mounting 4.8 According to the method of connection 4.9 According to the type of connection of the load conductors ! 4.9.1 RCM to which the monitored line is not directly connected See Figure 22a. 4.9.2 RCM to which the monitored line is directly connected See Figure 22b.” 4.10 According to fault indicating means 4.11 According to ability to directionally discriminate between supply side and load side residual currents |
| 17 | 5 Characteristics of RCMs 5.1 Summary of characteristics The characteristics of a RCM shall be stated in the following terms: 5.2 Rated quantities and other characteristics 5.2.1 Rated voltage 5.2.1.1 Rated operational voltage (Ue) The rated operational voltage (hereafter referred to as rated voltage Un) of a RCM is the value of voltage, assigned by the manufacturer, to which its performance is referred. 5.2.1.2 Rated insulation voltage (Ui) The rated insulation voltage of a RCM is the value of voltage, assigned by the manufacturer, to which dielectric test voltages and creepage distances are referred. Unless otherwise stated, the rated insulation voltage is the value of the maximum rated voltage of the RCM. In no case shall the maximum rated voltage exceed the rated insulation voltage. 5.2.2 Rated current (In) The value of current, assigned to the RCM by the manufacturer, which the RCM can carry in uninterrupted duty. !Text deleted” 5.2.3 Rated residual operating current (I%n) The value of residual operating current (see 3.2.4), assigned to the RCM by the manufacturer, at which the RCM shall operate under specified conditions. 5.2.4 Rated residual non-operating current (I%no) The value of residual non-operating current (see 3.2.5), assigned to the RCM by the manufacturer, at which the RCM does not operate under specified conditions. 5.2.5 Rated frequency The power frequency for which the RCM is designed and to which the values of the other characteristics correspond. |
| 18 | 5.2.6 Operating characteristics in case of residual currents with d.c. components Actuation is ensured by RCM for residual sinusoidal alternating currents and residual pulsating direct currents, whether suddenly applied or slowly rising. 5.2.7 Insulation coordination including clearances and creepage distances Under consideration. 5.3 Standard and preferred values 5.3.1 Preferred values of rated voltage (Un) The voltages 230 V and 400 V are standardized according to IEC 60038. These values shall progressively replace the values 220 V and 240 V, 380 V and 415 V, respectively. Wherever in this standard there is a reference to 230 V and 400 V, they may be read as 220 V or 240 V, 380 V or 415 V, respectively. For single-phase three-wire systems the standardized voltages are 120/240 V. 5.3.2 Preferred values of rated current (In) Preferred values of rated current are (only for RCMs according to 4.9.2) 10 – 13 – 16 – 20 – 25 – 32 – 40 – 63 – 80 – 100 -125 A. 5.3.3 Preferred values of rated residual operating current (I%n) !Preferred” values of rated residual operating current are 0,006 – 0,01 – 0,03 – 0,1 – 0,3 – 0,5 A. In case of RCMs having multiple settings of residual operating current the rating refers to the highest setting. 5.3.4 Standard value of residual non-operating current (I%no) The standard value of residual non-operating current is 0,5 I%n. 5.3.5 Standard minimum value of non-operating overcurrent in case of a multiphase balanced load through a multipath RCM (see 3.4.2.1) The standard minimum value of the non-operating current in case of a multiphase balanced load through a multipath RCM is 6 In. 5.3.6 Standard minimum value of the non-operating overcurrent through a RCM (see 3.4.2.2) The standard minimum value of the non-operating overcurrent through a RCM is 6 In. This clause does not apply to RCMs classified according to 4.9.1. The minimum value of the non-operating overcurrent through a R… |
| 19 | 5.3.7 Preferred values of rated frequency Preferred values of rated frequency are 50 Hz and/or 60 Hz. If another value is used, the rated frequency shall be marked on the device and the tests carried out at this frequency. 5.3.8 Standard and preferred values of the rated conditional short-circuit current (Inc) (only applicable to RCMs classified according to 4.9.2) 5.3.8.1 Values up to and including 10 000 A Up to and including 10 000 A the values of the rated conditional short-circuit current Inc are standard. They are: 3 000 – 4 500 – 6 000 – 10 000 A. The associated power factors are specified in Table 13. 5.3.8.2 Values above 10 000 A For values above 10 000 A up to and including 25 000 A a preferred value is 20 000 A. The associated power factors are specified in Table 13. Values above 25 000 A are not considered in this standard. 5.3.9 Maximum actuating time (Tmax) The actuating time for residual currents equal to or greater than I%n shall not exceed 10 s. ! 5.3.10 Minimum non-actuating time (Tmin) For RCMs with minimum non-actuating time according to 3.3.15, this time shall be declared by the manufacturer.” 5.4 Coordination with short-circuit protective devices (SCPDs) (only valid for RCMs classified according to 4.9.2) 5.4.1 General RCMs shall be protected against short-circuits by means of circuit-breakers or fuses complying with their relevant standards according to the installation rules of IEC 60364. Coordination between RCMs and the SCPD shall be verified under the general conditions of 9.11.2.1, by means of the tests describ… 5.4.2 Rated conditional short-circuit current (Inc) The r.m.s. value of prospective current, assigned by the manufacturer, which a RCM, protected by a SCPD, can withstand under specified conditions without undergoing alterations impairing its functions. The conditions are those specified in 9.11.2.2 a). 5.4.3 Rated conditional residual short-circuit current (I%c) The value of residual prospective current, assigned by the manufacturer, which a RCM, protected by a SCPD, can withstand under specified conditions without undergoing alterations impairing its functions. The conditions are those specified in 9.11.2.2 b). |
| 20 | 6 Marking and other product information !Each RCM and external devices of RCMs, if applicable, shall be marked in a durable manner with the following data:” a) the manufacturer’s name or trade mark; b) type designation, catalogue number or serial number; c) rated voltage(s); d) rated frequency, if the RCM is designed for frequencies other than 50 Hz and/or 60 Hz (see 5.3.7); e) rated current; f) rated residual operating current; g) settings of residual operating current in case of RCMs with multiple residual operating current settings; h) the degree of protection (only if different from IP20); j) the position of use (symbol according to IEC 60051), if necessary; k) operating means of the test device, by the letter T; l) wiring diagram; m) operating characteristic in presence of residual currents with d.c. components with the symbol: n) disabling means for the audible signal, by the symbol: o) installation instructions, including identification of current transformer(s) which may be used with the RCM; p) directionally discriminating RCM by the symbol: !q) the maximum actuating time (see 5.3.9); r) the minimum non-actuating time (see 5.3.10); s) the FE-terminal shall be marked “FE”. If, for small devices, the space available does not allow all the above data to be marked, at least the information under e), f)… The marking shall be on the RCM itself or on a nameplate or nameplates attached to the RCM and shall be located so that it is legible when the RCM is installed. |
| 21 | Table 1 – Standard conditions for operation in service a The maximum value of the mean daily temperature is + 35 ˚C. b Values outside the range are admissible where more severe climatic conditions prevail, subject to agreement between manufacturer and user. c Higher relative humidities are admitted at lower temperature (for example 90 % at 20 ˚C). d When a RCM is installed in proximity of a strong magnetic field, supplementary requirements may be necessary. e The device shall be fixed without causing deformation liable to impair its functions. f The tolerances given apply unless otherwise specified in the relevant test. g Extreme limits of – 20 ˚C and + 60 ˚C are admissible during storage and transportation, and should be taken into account in the design of the device. Additional components, e.g. separate warning units, shall be marked according to a), b), c), d) and n) (if applicable). If, for small devices, the space available does not allow all the above data to be marked, at least the information under e), f)… The manufacturer shall give the reference of one or more suitable SCPDs in his catalogues and in a sheet accompanying each RCM classified under 4.9.2. Red shall not be used for the test button nor for the resetting means, if any, of the RCM. If it is necessary to distinguish between the supply and the load terminals, they shall be clearly marked (e.g. by “line” and “load” placed near the corresponding terminals or by arrows indicating the direction of power flow). Terminals on the RCM for connecting the current transformer shall be clearly identified. Terminals exclusively intended for the connection of the neutral conductor shall be indicated by the letter N. Terminals intended for the protective conductor, if any, shall be indicated by the symbol [IEC 60417-2-5019 a)]. The marking shall be indelible, easily legible and not be placed on screws, washers or other removable parts. Compliance is checked by inspection and by the test of 9.3. |
| 22 | 7 Standard conditions for operation in service and for installation 7.1 Standard conditions RCMs complying with this standard shall be capable of operating under the standard conditions shown in Table 1. 7.2 Conditions of installation RCMs shall be installed in accordance with the manufacturer’s instructions. 8 Requirements for construction and operation 8.1 Mechanical design 8.1.1 General A RCM may provide for remote indication of the fault condition. It shall not be possible to alter the operating characteristics of the RCM by means of external interventions other than those specifically intended for changing the setting of the residual operating current or the time delay. Where RCMs are fitted with an internal current transformer (CT), but have the capability of selecting an optional external CT, a… 8.1.2 Features !The RCM shall be provided with a visual “Power on” indicator which shall neither be red, yellow nor blue.” The RCM shall be provided with means for indicating a fault condition when the residual current exceeds the preset operating val… Where an audible alarm is provided in addition, the audible signal shall be easily perceptible by persons with normal hearing and may have adjustable sound level. It is permissible to switch off the audible alarm whilst the fault is present. The audible alarm, if any, shall be automatically self-resetting on removal of the fault. In the event of a subsequent fault following removal of the first fault, the audible alarm shall be reactivated. RCMs may be fitted with a resetting means to manually reset the RCM to the non-alarm state after removal of the fault. RCMs not fitted with a resetting means shall reset automatically after removal of the fault. Where means are provided for adjustment of the residual operating current or of the delay time, such adjustment shall only be possible by the use of a tool. Compliance with the above paragraphs is checked by inspection during the tests according to 9.9. ! 8.1.3 Clearances and creepage distances (see also Annex B) Clearance and creepage distances applicable to the RCM and its external components, e.g. current transformers etc., with the exception of printed circuit boards, shall comply with the requirements of Table 2 when the RCM is mounted as for normal use. The above requirements shall also apply to active conductors (phases and neutral) connected directly to the printed circuit board. Creepage distances applicable to printed circuit boards of the RCM shall comply with the requirements of Table 4 of IEC 60664-1, “Creepage distances to avoid failure due to tracking”, Pollution degree 2, Material group III. Table 4 of IEC 60664-1 includes requirements for uncoated printed circuit boards. IEC 60664-3 provides for reduced clearance and… |
| 23 | Table 2 – Clearances and creepage distances mm – between live parts of different polaritybc – between live parts and . metal resetting means . metal test button . screws or other means for fixing covers which have to be removed when mounting the RCM . the surface on which the base is mountedd . screws or other means for fixing the RCMd . metal covers or boxesd . other accessible metal partse . metal frames supporting flush-type RCMs 3 3 3 3 6 (3) 6 (3) 6 (3) 3 3 – between live parts of different polaritybc . for RCMs having a rated voltage not exceeding 250 V . for other RCMs – between live parts and . metal resetting means . metal test button . screws or other means for fixing covers which have to be removed when mounting the RCM . screws or other means for fixing the RCMsd . accessible metal partse 3 4 3 3 3 6 (3) 3 a Clearances and creepage distances of the secondary circuit and between the primary windings of the RCM transformer are not considered. b Care should be taken for providing adequate spacing between live parts of different polarity of RCMs of the plug-in type mounted close to one another. Values are under consideration. c In some countries greater distances between terminals are used in accordance with national practices. d If clearances and creepage distances between live parts of the device and the metallic screen or the surface on which the RCM … e Including a metal foil in contact with the surfaces of insulating material which are accessible after installation as for normal use. The foil is pushed into corners, grooves, etc., by means of a straight jointed test finger according to 9.6. 8.1.4 Screws, current-carrying parts and connections 8.1.4.1 Connections, whether electrical or mechanical, shall withstand the mechanical stresses occurring in normal use. Screws operated when mounting the RCM during installation shall not be of the thread-cutting type. Compliance is checked by inspection and by the test of 9.4. 8.1.4.2 For screws in engagement with a thread of insulating material and which are operated when mounting the RCM during installation, correct introduction of the screw into the screw hole or nut shall be ensured. Compliance is checked by inspection and by manual test. |
| 24 | 8.1.4.3 Electrical connections shall be so designed that contact pressure is not transmitted through insulating material other t… Compliance is checked by inspection. 8.1.4.4 Current-carrying parts including parts intended for protective conductors, if any, shall be of The requirements of this subclause do not apply to contacts, magnetic circuits, heater elements, bimetals, shunts, parts of electronic devices or to screws, nuts, washers, clamping plates, similar parts of terminals and parts of the test circuit. 8.1.5 Terminals for external conductors 8.1.5.1 Terminals for external conductors shall be such that the conductors may be connected so as to ensure that the necessary contact pressure is maintained permanently. In this standard, screw-type terminals for external copper conductors only are considered. Connection arrangements intended for busbar connection are admissible, provided they are not used for the connection of cables. Such arrangements may be either of the plug-in or of the bolt-on type. The terminals shall be readily accessible under the intended conditions of use. Compliance is checked by inspection and by the tests of 9.5. 8.1.5.2 RCMs according to classification 4.9.2 shall be provided with terminals which shall allow the connection of copper conductors having nominal cross-sectional areas as shown in Table 3. Compliance is checked by inspection, by measurement and by fitting in turn one conductor of the smallest and one of the largest cross-sectional area as specified. 8.1.5.3 The means for clamping the conductors in the terminals shall not serve to fix any other component, although they may hold the terminals in place or prevent them from turning. Compliance is checked by inspection and by the tests of 9.5. 8.1.5.4 Terminals for rated currents up to and including 32 A shall allow the conductors to be connected without special preparation. Compliance is checked by inspection. 8.1.5.5 Terminals shall have adequate mechanical strength. Screws and nuts for clamping the conductors shall have a metric ISO thread or a thread comparable in pitch and mechanical strength. Compliance is checked by inspection and by the tests of 9.4 and 9.5.1. |
| 25 | Table 3 – Connectable cross-sections of copper conductors for screw-type terminals A mm2 13 16 25 32 50 80 100 16 25 32 50 80 100 125 1 1,5 2,5 4 10 16 24 to to to to to to to to 2,5 4 6 10 16 25 35 50 1 1,5 2,5 4 10 16 24 to to to to to to to to 2,5 4 6 6 10 16 25 35 a It is required that, for current ratings up to and including 50 A, terminals be designed to clamp solid conductors as well as … 8.1.5.6 Terminals shall be so designed that they clamp the conductor without undue damage to the conductor. Compliance is checked by inspection and by the test of 9.5.2. 8.1.5.7 Terminals shall be so designed that they clamp the conductor reliably and between metal surfaces. Compliance is checked by inspection and by the tests of 9.4 and 9.5.2. 8.1.5.8 Terminals shall be so designed or positioned that neither a rigid solid conductor nor a wire of a stranded conductor can slip out while the clamping screws or nuts are tightened. This requirement does not apply to lug terminals. Compliance is checked by the test of 9.5.3. 8.1.5.9 Terminals shall be so fixed or located that, when the clamping screws or nuts are tightened or loosened, their fixings do not work loose. These requirements do not imply that the terminals shall be so designed that their rotation or displacement is prevented, but any movement shall be sufficiently limited so as to prevent non-compliance with the requirements of this standard. The use of sealing compound or resin is considered to be sufficient for preventing a terminal from working loose, provided that Compliance is checked by inspection, by measurement, and by the test of 9.4. 8.1.5.10 Clamping screws or nuts of terminals intended for the connection of protective conductors shall be adequately secured against accidental loosening and it shall not be possible to unclamp them without a tool. Compliance is checked by manual test. In general, common designs of terminals provide sufficient resilience to comply with this requirement; for some designs special provisions, such as the use of an adequately resilient part which is not likely to be removed inadvertently, may be necessary. 8.1.5.11 Screws and nuts of terminals intended for the connection of external conductors shall be in engagement with a metal thread and the screws shall not be of the tapping screw type. |
| 26 | 8.2 Protection against electric shock RCMs shall be so designed that, when they are mounted and wired as for normal use, live parts are not accessible. A part is considered to be “accessible” if it can be touched by the standard test finger (see 9.6). !The continuous current through the protective conductor shall not exceed 1 mA under normal supply conditions.” For RCMs other, than those of the plug-in type, external parts, other than screws or other means for fixing covers and labels, w… Linings shall be fixed in such a way that they are not likely to be lost during installation of RCMs. They shall have adequate thickness and mechanical strength and shall provide adequate protection at places where, sharp edges occur. Inlet openings for cables or conduits shall either be of insulating material or be provided with bushings or similar devices of insulating material. Such devices shall be reliably fixed and shall have adequate mechanical strength. For plug-in RCMs external parts other than screws or other means for fixing covers, which are accessible for normal use, shall be of insulating material. Metallic resetting means and metallic test buttons shall be insulated from live parts and their conductive parts which otherwise… It shall be possible to easily replace plug-in RCMs without touching live parts. Lacquer and enamel are not considered to provide adequate insulation for the purpose of this subclause. !Compliance is checked by measurement, by inspection and by the test of 9.6.” 8.3 Dielectric properties RCMs shall have adequate dielectric properties. Control circuits connected to the main circuit shall not be damaged by high d.c. voltages due to insulation measurements which are normally carried out after RCMs are installed. Compliance is checked by the tests of 9.7 and 9.18. 8.4 Temperature rise This subclause is applicable to RCMs classified under 4.9.2. The temperature rise of RCMs classified under 4.9.1 is verified only by the test of 9.10.2.2. 8.4.1 Temperature-rise limits The temperature rises of the parts of a RCM specified in Table 4, measured under the conditions specified in 9.8.2, shall not exceed the limiting values stated in Table 4. The RCM shall not suffer damage impairing its functions and its safe use. 8.4.2 Ambient air temperature The temperature-rise limits given in Table 4 are applicable only if the ambient air temperature remains between the limits given in Table 1. 8.5 Operating characteristic The operating characteristic of RCMs shall comply with the requirements of 9.9. |
| 27 | 8.6 Directional discrimination !8.6.1″ For RCMs which are declared by the manufacturer to be able to discriminate between residual fault currents due to faults on the supply, side and faults on the load side, compliance is checked by the tests of 9.9.5. Table 4 – Temperature-rise values K External parts liable to be touched during manual operation of the RCM External metallic parts of resetting means and of test button Other external parts, including that face of the RCM in direct contact with the mounting surface 40 25 60 a No value is specified for parts other than those listed, but no damage shall be caused to adjacent parts of insulating materials, and the operation of the RCM shall not be impaired. b For plug-in type RCMs the terminals of the base on which they are installed. !8.6.2 The internal impedance between line terminal and the FE terminal shall have a value not less than 10 M7 at 50/60 Hz. At higher frequencies the impedance may be reduced proportionately, however to not less than 1 M7. Compliance is checked by the tests under 9.9.5e).” 8.7 Operational endurance The test circuit and the functions activated by the test device shall endure a prescribed number of operations, and the visible signal and the audible signal (if any) shall be able to operate in the alarm state for a prescribed period of time. Compliance is checked by the tests of 9.10. 8.8 Performance at short-circuit currents RCMs shall be capable of withstanding a specified number of short-circuits during which they shall neither endanger persons or surroundings nor initiate flashovers between live parts or between such parts and earth. Compliance is checked by the tests of 9.11. 8.9 Resistance to mechanical impact RCMs shall have adequate mechanical behaviour so as to withstand the stresses imposed during installation and use. Compliance is checked by the test of 9.12. 8.10 Resistance to heat RCMs shall be sufficiently resistant to heat. Compliance is checked by the test of 9.13. 8.11 Resistance to abnormal heat and to fire Parts of insulating material which might be exposed to thermal stresses due to electric effects, and the deterioration of which might impair the safety of the RCM, shall not be unduly affected by abnormal heat and fire. Compliance is checked by the tests of 9.14. |
| 28 | 8.12 Test device RCMs shall be provided with a test device in order to allow a periodic testing of the ability of the RCM to operate. The test circuit shall be designed for continuous operation at 1,1 times the rated voltage. The ampere-turns produced when operating the test device of an RCM supplied at rated voltage or at the highest value of the volt… In the case of RCMs having several settings of residual operating current (see 4.4) the highest setting for which the RCMs have been designed shall be used. The test device shall comply with the test of 9.15. If the test circuit is operated through the protective conductor, the current flowing through the conductor shall not exceed 1 mA. The protective conductor of the installation shall not become live when the test device is operated. The RCM may be fitted with a latching facility which retains the fault indication after the fault is cleared. Where such facility exists, the RCM must be equipped with means for resetting. Compliance is checked by inspection, measurement and by the test of 9.15. 8.13 Correct operation of RCMs within the supply voltage range RCMs shall function reliably at any voltage between 85 % and 110 % of the rated voltage(s). Compliance is checked by the tests of 9.9. 8.14 Behaviour of RCMs in case of overcurrents in the main circuit RCMs shall not operate under specified conditions of overcurrents. Compliance is checked by the test of 9.16. 8.15 Resistance of RCMs to unwanted tripping due to current surges caused by impulse voltages RCMs shall adequately withstand the current surges to earth due to the loading of the capacitances of the installation. Compliance is checked by the test of 9.17. 8.16 Behaviour of RCMs in case of earth fault currents comprising d.c. components RCMs shall adequately perform in presence of earth fault currents comprising d.c. components. Compliance is checked by the tests of 9.19. 8.17 Reliability RCMs shall operate reliably even after long service, taking into account the ageing of their components. Compliance is checked by the tests of 9.20 and 9.21. ! 8.18 Electromagnetic compatibility (Based on IEC 61543) Standard electromagnetic environmental conditions are those conditions which occur in installations connected to low voltage public networks or similar installations.” |
| 29 | ! 8.18.1 Low frequency electromagnetic phenomena The type tests set out in this standard contain the EMC requirements for low frequency electromagnetic phenomena as applicable to RCMs. a Table Z.1 – Low frequency immunity test conditions Reference (see Table 1 of IEC 61543) Electromagnetic phenomena Reference of basic standard for test description Test level and test specification Subclause including the performance criteria T 1.3 a A study is undertaken for possible inclusion of requirements in a future revision. b ! 8.18.2 High frequency immunity The data for the high frequency immunity to be applied are set out in Table 15. 8.18.3 Electrostatic discharges The data for the electrostatic discharge tests to be applied are set out in Table 15. 8.18.4 Electromagnetic emission Emission tests are required for RCMs producing continuous or intermittent output signals. The tests shall be carried out according to CISPR 14-1. |
| 30 | ! Table 15 – EMC Tests Test No. Subclause including the performance criteria Test title Reference of basic standard for test description Test level and specification 0,15 MHz to 80 MHz Z = 150 7 3 V for I%n U 30 mA 1 V for I %n< 30 mA Level 4: 4 kV (peak), on power supply port, and 2 kV (peak), on control (auxiliary port) Tr/Th 5/50 ns Repetition frequency 2,5 kHz Tr/Th 1.2/50 »s 4 kV (peak)/12 7 Common mode 2 kV (peak)/2 7 Differential mode a The test is carried out as a single-phase test on one pole of each sample, taken at random. Three new samples are submitted to… b Common mode and differential mode tests are carried out only at the values stated in this table. c The point to which discharges shall be applied is selected by an exploration of the accessible surfaces of the RCM when instal… ” 8.19 Connection of an external current transformer (CT) If an external CT is used, the RCM shall automatically switch to the alarm state if the CT is disconnected. Compliance is checked by the tests of 9.9.4. |
| 31 | 9 Tests 9.1 General 9.1.1 The characteristics of RCMs are checked by means of type tests. Type tests required by this standard are listed in Table 5. Table 5 – List of type tests depending on RCM classification – – – – – – – – – – – – – – – – – – – Reliability of screws, current-carrying parts and connections Reliability of terminals for external !conductors” Protection against electric shock Dielectric properties Temperature rise Operating characteristics Operational endurance Behaviour of RCMs under short-circuit conditions Resistance to mechanical impact Resistance to heat Resistance to abnormal heat and fire Operation of the test device at the limits of rated voltage Limiting values of the non-operating current under overcurrent conditions Resistance against unwanted actuation due to an impulse voltage Resistance of the insulation against an impulse voltage Behaviour of RCMs in case of an earth fault current comprising a d.c. component Reliability Ageing of electronic components Electromagnetic compatibility (under consideration) 9.4 9.5 9.6 9.7 9.8 9.9 9.10 9.11 9.12 9.13 9.14 9.15 9.16 9.17 9.18 9.19 9.20 9.21 9.22 X n.a. X X n.a. X X n.a. X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Table 6 – Test copper conductors corresponding to the rated currents A In < 6 6 < In < 13 13 <In < 20 20 < In < 25 25 < In < 32 32 < In < 50 50 < In < 63 63 < In < 80 80 < In < 100 100 < In < 125 mm2 9.1.2 For certification purposes, type tests are carried out in test sequences. The test sequences and the number of samples to be submitted are stated in Annex A. Unless otherwise specified, each type test (or sequence of type tests) is made on RCMs in a clean and new condition, the influencing quantities having their normal reference values (see Table 1). 9.1.3 Routine tests are to be carried out by the manufacturer on each device. |
| 32 | 9.2 Test conditions The RCM is mounted individually according to the manufacturer’s instructions and in free air, at an ambient temperature between 20 ˚C and 25 ˚C, unless otherwise specified, and is protected against undue external heating or cooling. RCMs designed for installation in individual enclosures are tested in the smallest enclosure specified by the manufacturer. Unless otherwise specified, the RCM is wired with the appropriate cable having the cross-section specified in Table 6 and is fix… Where tolerances are not specified, type tests are carried out at values not less severe than those specified in this standard. Unless otherwise specified, tests are carried out at the rated frequency ± 5 %. During the tests no maintenance or dismantling of the samples is allowed. For the tests of 9.8, 9.9, 9.10 and 9.21, the RCM is connected as follows: The tightening torques to be applied to the terminal screws are two-thirds of those specified in Table 7. 9.3 Test of indelibility of marking The test is made by rubbing the marking by hand for 15 s with a piece of cotton soaked with water and again for 15 s with a piec… Marking made by impressing, moulding or engraving is not subjected to this test. After this test the marking shall be easily legible. The marking shall also remain easily legible after all the tests of this standard. It shall not be easily possible to remove labels and they shall show no curling. 9.4 Test of reliability of screws, current-carrying parts and connections Compliance with the requirements of 8.1.4 is checked by inspection and, for screws and nuts which are operated when mounting and connecting the RCM, by the following test. The screws or nuts are tightened and loosened Screws or nuts in engagement with a thread of insulating material are completely removed and reinserted each time. The test is made by means of a suitable test screwdriver or spanner applying a torque as shown in Table 7. The screws and nuts shall not be tightened in jerks. The test is made with rigid conductors only, having the largest cross-sectional areas specified in Table 3, solid or stranded, whichever is the most unfavourable. The conductor is moved each time the screw or nut is loosened. |
| 33 | Table 7 – Screw thread diameters and applied torques mm Nm 2,8 3,0 3,2 3,6 4,1 4,7 5,3 6,0 8,0 3,0 3,2 3,6 4,1 4,7 5,3 6,0 8,0 10,0 0,25 0,3 0,4 0,7 0,8 0,8 1,2 2,5 – 0,5 0,6 0,8 1,2 1,8 2,0 2,5 3,5 4,0 0,5 0,6 0,8 1,2 1,8 2,0 3,0 6,0 10,0 Column I applies to screws without heads if the screw, when tightened, does not protrude from the hole, and to other screws which cannot be tightened by means of a screwdriver with a blade wider than the diameter of the screw. Column II applies to other screws which are tightened by means of a screwdriver. Column III applies to screws and nuts which are tightened by means other than a screwdriver. Where a screw has a hexagonal head with a slot for tightening with a screwdriver and the values in columns II and III are differ… During the test, the screwed connections shall not work loose and there shall be no damage, such as breakage of screws or deterioration to the head slots, threads, washers or stirrups, that will impair the further use of the RCM. Moreover, enclosures and covers shall not be damaged. 9.5 Test of reliability of terminals for external conductors Compliance with the requirements of 8.1.5 is checked by inspection, by the test of 9.4, for which a rigid copper conductor havin… 9.5.1 The terminals are fitted with copper conductors of the smallest and largest cross-sectional areas specified in Table 3, solid or stranded, whichever is the most unfavourable. The conductor is inserted into the terminal for the minimum distance prescribed or, where no distance is prescribed, until it ju… The clamping screws are then tightened with a torque equal to two-thirds of that shown in the appropriate column of Table 7. Each conductor is then subjected to the pull shown in Table 8. The pull is applied without jerks, for 1 min, in the direction of the axis of the space intended for the conductor. During the test, the conductor shall not move noticeably in the terminal. |
| 34 | 9.5.2 The terminals are fitted with copper conductors of the smallest and largest cross-sectional areas specified in Table 3, so… The terminal screws are then loosened and the part of the conductor which may have been affected by the terminal is inspected. The conductors shall show no undue damage nor severed wires. During the test, terminals shall not work loose and there shall be no damage, such as breakage of screws or damage to the head slots, threads, washers or stirrups, that will impair the further use of the terminal. 9.5.3 The terminals are fitted with a rigid stranded copper conductor having the make-up shown in Table 9. Table 8 – Pulling forces mm2 4 6 10 16 50 N Table 9 – Conductor dimensions mm2 mm 1,0 to 4,0a inclusive 1,5 to 6,0a inclusive 2,5 to 10,0 inclusive 4,0 to 16,0 inclusive 10,0 to 25,0 inclusive 16,0 to 35,0 inclusive 25,0 to 50,0 inclusive 7 7 7 7 7 19 Under consideration 0,85 1,04 1,35 1,70 2,14 1,53 Under consideration a If the terminal is intended to clamp solid conductors only (see a of Table 3), the test is not made. Before insertion in the terminal, the strands of the conductor are suitably reshaped. The conductor is inserted into the terminal until the conductor reaches the bottom of the terminal or just projects from the far… After the test no strand of the conductor shaft have escaped outside the retaining device. 9.6 Verification of protection against electric shock This requirement is applicable to those parts of RCMs which are exposed to the operator when mounted as for normal use. The test is made with the standard test finger shown in Figure 1, on the RCM mounted as for normal use (see note of 8.2) and fitted with conductors of the smallest and largest cross-sections which may be connected to the RCM. The standard test finger shall be so designed that each of the jointed sections can be turned through an angle of 90˚ with respect to the axis of the finger, in the same direction only. The standard test finger is applied in every possible bending position of a real finger, an electrical contact indicator being used to show contact with live parts. |
| 35 | It is recommended that a lamp be used for the indication of contact and that the voltage be not less than 40 V. The standard test finger shall not touch live parts. RCMs with enclosures or covers of thermoplastic material are subjected to the following additional test, which is carried out at an ambient temperature of 35 ˚C ± 2 ˚C, the RCM being at this temperature. RCMs are subjected for 1 min to a force of 75 N, applied through the tip of a straight unjointed test finger of the same dimensi… During this test, enclosures or covers shall not deform to such an extent that live parts can be touched with the unjointed test finger. Unenclosed RCMs having parts not intended to be covered by an enclosure are submitted to the test with a metal front panel, and mounted as for normal use. !RCMs equipped with a functional earth connection (FE) shall be tested by means of the test circuit and the test description shown below. The RCM is supplied at 1,1 Un. The voltage across Re is measured under normal conditions. This voltage shall not exceed 1 mV.” 9.7 Test of dielectric properties 9.7.1 Resistance to humidity 9.7.1.1 Preparation of the RCM for test Parts of the RCM which can be removed without the aid of a tool, are removed and subjected to the humidity treatment with the main part; spring lids are kept open during this treatment. Inlet openings, if any, are left open; if knock-outs are provided, one of them is opened. 9.7.1.2 Test conditions The humidity treatment is carried out in a humidity cabinet containing air with a relative humidity maintained between 91 % and 95 %. The temperature of the air in which the sample is placed is maintained within ± 1 ˚C of any convenient value T between 20 ˚C and 30 ˚C. Before being placed in the humidity cabinet, the sample is brought to a temperature between T and T + 4 ˚C. 9.7.1.3 Test procedure The sample is kept in the cabinet for 48 h. 9.7.1.4 Condition of the RCM after the test After this treatment, the sample shall show no damage within the meaning of this standard and shall withstand the tests of 9.7.2 and 9.7.3. |
| 36 | ! 9.7.2 Insulation resistance of the RCM The RCM having been treated as specified in 9.7.1 is then removed from the cabinet. After an interval between 30 min and 60 min following the treatment of 9.7.1, a d.c. voltage of approximately 500 V is applied for 30 s as follows: The insulation resistance is then measured and shall not be less than 5 MÀ. 9.7.3 Dielectric strength of the RCM A test voltage of 2 000 V at power frequency is applied for 1 min as follows: The source of the test voltage shall be capable of supplying a short circuit current of 200 mA ± 10 %. No overcurrent tripping device of the source shall operate when the current in the output circuit is less than 100 mA. Initially not more than half the prescribed voltage is applied, then the voltage is raised to the full value within 5 s. No flashover or breakdown shall occur during the test. Glow discharges without drop in voltage are ignored. 9.7.4 Capability of the RCM to withstand high d.c. voltages due to insulation measurements This test is applicable only for RCMs with rated voltages greater than 50 V a.c. or greater than 120 V d.c. The test is carried out on the RCM fixed on a metal support with all external circuits including the external CT and remote alarm unit if any being connected as in service. A d.c. voltage source is used with the following characteristics: – open circuit voltage 500 V+25%0 – maximum ripple 5 % – short circuit current: (12+20) mA The test voltage is applied for 1 min between each supply terminal and the other supply terminals in turn. After this test, the RCM shall be capable of performing satisfactorily the tests specified in 9.9.2a), b) and c).” |
| 37 | ! Table 16 – Summary of the tests contained in 9.7.2, 9.7.3 and 9.7.4. Sub- clause Title of test How or where applied Voltage Conditions Required result Only for RCMs with rated voltage 50 V a.c. or 120 V d.c. The test is carried out on the RCM with all external circuits including the external CT and remote alarm unit if any connected as in service. The test voltage is applied between each supply terminal and the other supply terminals in turn. ” 9.8 Test of temperature rise 9.8.1 Ambient air temperature The ambient air temperature shall be measured during the last quarter of the test period by means of at least two thermometers o… The thermometers or thermocouples shall be protected against draughts and radiant heat. |
| 38 | 9.8.2 Test procedure RCMs and all relevant parts are mounted and connected according to the manufacturer’s instructions and with the rated voltage ap… For RCMs with four current paths the test is first made by passing the specified current through the three current paths of the phases only. The test is then repeated by passing the current through the path intended for the connection of the neutral and the adjacent current path. During these tests the temperature rise shall not exceed the values shown in Table 4. 9.8.3 Measurement of the temperature rise of parts The temperature of the different parts referred to in Table 4 shall be measured by means of fine wire thermocouples or by equivalent means at the nearest accessible position to the hottest spot. Good heat conductivity between the thermocouple and the surface of the part under test shall be ensured. 9.8.4 Temperature rise of a part The temperature rise of a part is the difference between the temperature of this part measured in accordance with 9.8.3 and the ambient air temperature measured in accordance with 9.8.1. 9.9 Verification of the operating characteristics 9.9.1 Test circuit The RCM is installed as for normal use. The test circuit shall be of negligible inductance and correspond to Figure 2a or Figure 2b, as applicable. The instruments for the measurement of the residual current shall be at least of class 0,5 and shall show (or permit to determine) the true r.m.s. value. The instruments for the measurement of time shall have a relative error not greater than 10 % of the measured values. 9.9.2 Off-load tests with residual sinusoidal alternating currents at the reference temperature of 20 ˚C ± 2 ˚C The RCM shall perform the following tests made on one phase only, taken at random. The RCM is connected according to the test circuit of Figure 2a, in the case of a sudden appearance of residual current. The supply voltage is set at 110 % of the rated voltage. In the case of more than one rated voltage the test is made at each rated voltage. RCMs with adjustable delay times are set to their minimum delay setting. RCMs with adjustable residual operating current are set to their minimum value. RCMs suitable for internal or external CTs shall be set for operation with internal CT. For the tests a), b), c) and d), S1 is initially set to the TN position. a) S2 is opened. |
| 39 | b) S2 is opened. c) S2 is opened. d) S2 is opened. e) Test a), b), c) and d) are repeated at 0,85 Un. f) Tests a), b), c), d) and e) are repeated with S1 in the TT position. g) For RCMs with adjustable delay time the tests a), b), c), d) and e) are repeated at their maximum setting of time delay. h) For RCMs with adjustable residual operating current the tests a), b), c), d) and e) are repeated at their maximum setting of residual operating current. 9.9.3 Verification of the correct operation with load at the reference temperature The tests of 9.9.2 are repeated, the RCMs being loaded with rated current and rated supply voltage as in normal service for a sufficient time so as to reach steady-state conditions. In practice these conditions are reached when the variation of temperature rise does not exceed 1 K per hour. 9.9.4 Verification of the connection and the function of an external current transformer (CT) This test is only applicable to RCMs with facility for connection of an external CT. a) The external CT is connected to the RCM as in normal use as prescribed by the manufacturer. |
| 40 | b) For RCMs with multiple settings of rated residual operating current, the test of 9.9.4 a) is made at the lowest and highest settings. 9.9.5 Verification of directional discrimination for RCMs classified according to 4.11 The RCM is connected according to the test circuit of Figure 2b. For RCMs having multiple settings of residual operating current, the tests are made at the maximum and at the minimum settings. a) Fault on the load side of the RCM: b) Fault on the supply side of the RCM: c) Discrimination against transient faults on the supply side of the RCM: d) Discrimination against transient double faults on the supply side of the RCM when used in IT-systems. e) Value of the internal impedance for directionally discriminating RCMs. The requirements under 8.6.1 shall be verified.” 9.10 Verification of operational endurance The tests in this subclause are made to verify the operational endurance of the test circuits and the alarm(s) of the RCM. 9.10.1 General test conditions The RCM and its remote alarm accessories, if any, are mounted as for normal operation, supplied with 1,1 times rated voltage. |
| 41 | 9.10.2 Test procedure 9.10.2.1 Circuit for the cycling test The RCM shall undergo 500 test cycles as follows: The test device is operated and maintained in the ON position until the alarm is activated. For RCMs provided with manual reset, the test device is released as soon as the RCM alarm is activated. The RCM is then reset within 5 s. For RCMs not provided with manual reset, the test cycle is repeated after a time interval between 1 s and 2 s. After all the test cycles are completed, the test circuit, and the alarm(s) shall function satisfactorily, and no changes shall have occurred which may adversely affect the further use of the RCM. 9.10.2.2 Endurance of alarm(s) The RCM is brought to the alarm state and maintained there for 48 h. All alarm functions shall remain switched on and they shall function properly during and after this test and no temperatures shall exceed those listed in Table 4. 9.11 Verification of short-circuit withstand capability 9.11.1 List of the short-circuit tests The tests to verify the withstand capability of RCMs under short-circuit conditions are the following: 9.11.2 Short-circuit tests 9.11.2.1 General conditions for test The conditions of 9.11.2 are applicable to all tests intended to verify the behaviour of the RCMs under short- circuit conditions. a) Test circuit (applies only to RCMs classified according to 4.9.2 and 4.3). |
| 42 | b) Tolerances on test quantities |
| 43 | c) Power factor of the test circuit Table 11 – Silver wire diameter as a function of rated current and short-circuit currents A 1 000 1 500 3 000 4 500 6 000 0,30 0,35 0,35 0,35 0,35 0,50 0,50 0,50 0,50 0,50 0,65 0,60 0,60 0,60 0,85 0,80 0,80 0,75 0,95 0,90 0,90 1,15 1,15 1,00 a The silver wire diameter values are essentially based on peak current (Ip) considerations (see Table 12). d) Calibration of the test circuit e) Sequence of operations f) Behaviour of the RCM under test g) Condition of the RCM after test After each of the tests applicable and carried out in accordance with 9.11.2.2 a) and 9.11.2.2 b) the RCM shall show no damage i… Under the test conditions of 9.9.2.1 a) the RCM shall operate with a test current of 1,25 I%n. One test only is made at one phase taken at random, without measurement of actuating time. |
| 44 | Table 12 – Minimum values of I2t and Ip kA kA2s kA kA2s kA kA2s kA kA2s kA kA2s kA kA2s Table 13 – Power factors for short-circuit tests A |
| 45 | 9.11.2.2 Verification of the coordination between the RCM and the SCPD These tests are intended to verify that the RCM, protected by the SCPD, is able to withstand, without damage, short-circuit currents up to its rated conditional short-circuit current (see 5.3.8). The short-circuit current is interrupted by the SCPD. The SCPD is renewed after each operation, if required. The following tests are made under the general conditions of 9.11.2.1: a) Verification of the coordination at the rated conditional short-circuit current (Inc) 1) Test conditions 2) Test procedure b) Verification of the coordination at rated conditional residual short-circuit current (I%c) 1) Test conditions 2) Test procedure 3) Condition of the RCM after the tests After the tests RCM shall not have suffered damages leading to non-compliance with this standard. 9.12 Verification of resistance to mechanical impact Compliance is checked on those exposed parts of the RCM and remote alarm units, if any, mounted as for normal conditions of use,… 9.12.1 The samples are subjected to blows by means of an impact-test apparatus as shown in Figure 9 to Figure 11. The head of the striking element has a hemispherical face of radius 10 mm and is of polyamide having a Rockwell hardness of HR 1… The axis of the pivot is 1 000 mm ± 1 mm above the axis of the striking element. |
| 46 | For determining the Rockwell hardness of the polyamide of the head of the striking element, the following conditions apply: 100 N ± 2 N; The design of the test apparatus is such that a force of between 1,9 N and 2,0 N has to be applied to the face of the striking element to maintain the tube in the horizontal position. Surface-type RCMs are mounted on a sheet of plywood, 175 mm ° 175 mm, 8 mm thick, secured at its top and bottom edges to a rigid bracket, which is part of the mounting support, as shown in Figure 11. The mounting support shall have a mass of 10 kg ± 1 kg and shall be mounted on a rigid frame by means of pivots. The frame is fixed to a solid wall. Flush-type RCMs are mounted in a device, as shown on Figure 12, which is fixed to the mounting support. Panel-mounting type RCMs are mounted in a device, as shown in Figure 13, which is fixed to the mounting support. Plug-in type RCMs are mounted in their appropriate sockets, which are fixed on the sheet of plywood or in the devices according to Figure 12 or Figure 13, as applicable. RCMs for rail mounting are mounted on their appropriate rail which is rigidly fixed to the mounting support. The design of the test apparatus is such that The RCM with its covers, if any, is mounted as in normal use on the plywood or in the appropriate device, as applicable, so that the point of impact lies in the vertical plane through the axis of the pivot of the pendulum. Cable entries which are not provided with knock-outs are left open. If they are provided with knock-outs, two of them are opened. Before applying the blows, fixing screws of bases, covers and the like are tightened with a torque equal to two-thirds of that specified in Table 7. The striking element is allowed to fall from a height of 10 cm on the surfaces which are exposed when the RCM is mounted as for normal use. The height of fall is the vertical distance between the position of a checking point when the pendulum is released and the posit… Each RCM is subjected to 10 blows evenly distributed over the parts of the sample likely to be subjected to impact. The blows are not applied to knock-out areas or to any openings covered by a transparent material. In general, one blow is applied on each lateral side of the sample after it has been turned as far as possible, but not through … The remaining blows are then applied in the same way, after the sample has been turned through 90˚ about its axis perpendicular to the plywood. |
| 47 | If cable entries or knock-outs are provided, the sample is so mounted that the two lines of blows are as nearly as possible equidistant from these entries. After the test, the samples shall show no damage within the meaning of this standard. In particular, covers which, when broken, … In case of doubt, it is verified that removal and replacement of external parts, such as enclosures and covers, is possible without these parts or their lining being damaged. When testing RCMs designed for screw fixing as well as for rail mounting, the test is made on two sets of RCMs, one of them being fixed by means of screws and the other being mounted on a rail. 9.12.2 RCMs designed to be mounted on a rail are mounted as for normal use on a rail rigidly fixed on a vertical rigid wall, but without cables being connected and without any cover or cover-plate. A downward vertical force of 50 N is applied without jerks for 1 min on the forward surface of the RCM, immediately followed by an upward vertical force of 50 N for 1 min (Figure 14). During this test the RCM shall not become loose and after the test the RCM shall show no damage impairing its further use. 9.12.3 Plug-in type RCMs 9.13 Test of resistance to heat 9.13.1 The samples, without removable covers, if any, are kept in a heating cabinet at a temperature of 100 ˚C ± 2 ˚C; removable covers, if any, are kept for 1 h in the heating cabinet at a temperature of 70 ˚C ± 2 ˚C. During the test the samples shall not undergo any change impairing their further use, and sealing compound, if any, shall not flow to such an extent that live parts are exposed. After the test and after the samples, have been allowed to cool down to approximately room temperature, there shall be no access… Under the test conditions of 9.9.2.1 a) the RCM shall actuate with a test current of 1,25 I%n. Only one test is made, on one pole taken at random, without measurement of actuating time. After the test, markings shall still be legible. Discoloration, blisters or a slight displacement of the sealing compound are disregarded, provided that safety is not impaired within the meaning of this standard. 9.13.2 External parts of RCMs made of insulating material necessary to retain in position current-carrying parts or parts of the… The part to be tested is placed on a steel support with the appropriate surface in the horizontal position, and a steel ball of 5 mm diameter is pressed against this surface with a force of 20 N. The test is made in a heating cabinet at a temperature of 125 ˚C ± 2 ˚C. After 1 h, the ball is removed from the sample which is then cooled down within 10 s to approximately room temperature by immersion in cold water. The diameter of the impression caused by the ball is measured and shall not exceed 2 mm. |
| 48 | 9.13.3 External parts of RCMs made of insulating material not necessary to retain in position current-carrying parts and parts o… The tests of 9.13.2 and 9.13.3 are not made on parts of ceramic material. If two or more of the insulating parts referred to in 9.13.2 and 9.13.3 are made of the same material, the test is carried out only on one of these parts, according to 9.13.2 or 9.13.3 respectively. 9.14 Test of resistance to abnormal heat and to fire The glow-wire test is performed in accordance with clauses 4 to 10 of IEC 60695-2-1/0 under the following conditions: If insulating parts within the above groups are made of the same material, the test is carried out only on one of these parts, according to the appropriate glow-wire test temperature. The test is not made on parts of ceramic material. The glow-wire test is applied to ensure that an electrically heated test wire under defined test conditions does not cause ignit… The test is made on one sample. In case of doubt, the test shall be repeated on two further samples. The test is made by applying the glow-wire once. The sample shall be positioned during the test in the most unfavourable position of its intended use (with the surface tested in a vertical position). The tip of the glow-wire shall be applied to the specified surface of the test sample taking into account the conditions of the intended use under which a heated or glowing element may come into contact with the sample. The sample is regarded as having passed the glow-wire test if There shall be no ignition of the tissue paper or scorching of the pine-wood board. 9.15 Verification of the operation of the test device at the limits of rated voltage a) The RCM being supplied by a voltage equal to 0,85 times the rated voltage, the test device is momentarily actuated 25 times a… b) Test a) is then repeated at 1,1 times rated voltage. c) Test b) is then repeated, but only once, the resetting means of the test device being held in the closed position for 30 s. (A revision of this test is under consideration.) At each test the RCM shall activate the alarm. After the test, it shall show no change impairing its further use. |
| 49 | In order to check that the ampere-turns due to the operation of the test device are less than 3,5 times the ampere-turns produce… If, for such verification, the dismantling of the RCM is necessary, a separate sample shall be used. Where an alternative test method is used, the above verification of the ampere-turns does not apply. 9.16 Verification of limiting values of the non-operating current under overcurrent conditions !The tests of 9.16.1 and 9.16.2 are applicable only to RCMs classified under 4.9.2.” 9.16.1 Verification of the limiting value of overcurrent in case of a load through a RCM with two current paths !The RCM is connected according to Figure 16a.” The RCM is connected as for normal use with a substantially non-inductive load corresponding to a current of 6 In. RCMs functionally dependent on line voltage are supplied on the line side with the rated voltage (or, if relevant, with any voltage having a value within its range of rated voltages). The load is switched on using a two-pole test switch and then switched off after 1 s. The test is repeated three times, the interval between two successive closing operations being at least 1 min. The RCM shall not operate. 9.16.2 Verification of the limiting value of overcurrent in case of a single phase load through a three-pole or four-pole RCM The RCM is connected according to !Figure 16a.” RCMs functionally dependent on line voltage are supplied on the line side with the rated voltage (or, if relevant, with any voltage having a value within its range of rated voltages). The resistance R is adjusted so as to let a current equal to 6 In flow in the circuit. The test switch S1, being initially open, is closed and re-opened after 1 s. !Text deleted” The test is repeated three times for each possible combination of the current paths, the interval between two successive operations being at least 1 min. The RCM shall not operate. ! 9.16.3 Verification of the limiting value of overcurrent in case of a single phase load through an RCM with an external detecting device (transformer) The RCM is connected according to Figure 16b. RCMs functionally dependent on line voltage are supplied on the line side with the rated voltage (or if relevant, with any voltage having a value within its range of rated voltages). The resistance R is adjusted so as to let a current equal to 6 In flow in the circuit. The test switch S1, being initially open, is closed and reopened after 1 s. The test is repeated three times for each possible combination of current paths, the interval between two successive operations being at least 1 min. The RCM shall not operate.” |
| 50 | ! 9.17 Verification of resistance against unwanted operation due to current surges caused by impulse voltages” The RCM is tested using a surge generator capable of delivering a damped oscillatory current wave as shown in Figure 17. An example of circuit diagram for the connection of the RCM is shown in Figure 18. One phase of the RCM chosen at random shall be submitted to 10 applications of the surge current. The polarity of the surge wave shall be inverted after every two applications. The interval between two consecutive applications shall be about 30 s. The current impulse shall be measured by appropriate means and adjusted using an additional RCM of the same type with the same In and the same I%n, to meet the following requirements: During the tests, the RCM shall not be actuated. After the ring wave test, the correct operation of the RCM is verified by a test according to 9.9.2 c) at I%n only with the measurement of the actuating time. 9.18 Verification of resistance of the insulation against impulse voltages The test is carried out on a RCM fixed on a metal support, wired as in normal use and being in the closed position. The impulses are given by a generator producing positive and negative impulses having a front time of 1,2 »s and a time to half value of 50 »s, the tolerances being: A first series of tests is made at an impulse voltage of 6 kV peak, the impulses being applied between the phase(s), connected together, and the neutral of the RCM. A second series of tests is made at an impulse voltage of 8 kV peak, the impulses being applied between the metal support connected to the terminal(s) intended for the protective conductor(s), if any, and the phase(s) and the neutral connected together. In both cases, five positive impulses and five negative impulses are applied, the interval between consecutive impulses being at least 10 s. No unintentional disruptive discharge shall occur. If, however, only one such disruptive discharge occurs, ten additional impulses having the same polarity as that which caused the disruptive discharge are applied, the connections being the same as those with which the failure occurred. No further disruptive discharge shall occur. |
| 51 | The shape of the impulses is adjusted with the RCM under test connected to the impulse generator. For this purpose appropriate voltage dividers and voltage sensors shall be used. Small oscillations in the impulses are allowed, provided that their amplitude near the peak of the impulse is less than 5 % of the peak value. For oscillations on the first half of the front, amplitudes up to 10 % of the peak value are allowed. 9.19 Verification of the correct operation at residual currents with d.c. components The test conditions of 9.9.1 and 9.9.5 apply, except that the test circuits shall be those shown in Figure 3 and Figure 4, as applicable. 9.19.1 Verification of the correct operation in case of a continuous rise of the residual pulsating direct current For non-discriminating RCMs the test shall be performed according to Figure 3. The auxiliary switches S1 and S2 shall be closed. The relevant thyristor shall be controlled in such a manner that current delay… At every test the current shall be steadily increased at an approximate rate of 1,4 I%n/30 amperes per second for RCMs with I%n … Table 14 – Actuating current ranges A 90˚ 135˚ 0,25 I%n 0,11 I%n 1,4 I%n or 2 I%n (subclause 5.2.6) 9.19.2 Verification of the correct operation in case of suddenly appearing residual pulsating direct currents Non-discriminating RCMs shall be tested according to Figure 3. The circuit being successively calibrated at the values of I%n, 2 I%n and 5 I%n, and the auxiliary switch S1 being in the closed position, the residual current is suddenly established by closing the switch S2. Two tests are made at each value of I% multiplied by 1,4 for RCMs with I%n > 0,01 A and multiplied by 2 for RCMs with I%n < 0,01… The RCM shall operate at each test within 10 s. 9.19.3 Verification at the reference temperature of the correct operation with load The tests of 9.19.1 are repeated, the pole under test and one other pole of the RCM being loaded with the rated current, this current being established shortly before the test. 9.19.4 Verification of the correct operation in case of residual pulsating direct currents superimposed by smooth direct current of 0,006 A The RCM shall be tested according to Figure 4 with a half-wave rectified residual current (current delay angle µ = 0˚˚) superimposed by a smooth direct current of 0,006 A. |
| 52 | Each pole of the RCM is tested in turn, twice at each of positions I and II. The half-wave current I1, starting from zero, is steadily increased at an approximate rate of 1,4 I%n/30 amperes per second for … 9.20 Verification of reliability Compliance is checked by the tests of 9.20.1 and 9.20.2. 9.20.1 Climatic test The test is based on IEC 60068-2-30 taking into account IEC 60068-2-28. 9.20.1.1 Test chamber The chamber shall be constructed as stated in clause 2 of IEC 60068-2-30. Condensed water shall be continuously drained from the… Before entering the chamber, the distilled water shall have a resistivity of not less than 500 Àm and a pH value of 7,0 ± 0,2. During and after the test the resistivity should be not less than 100 Àm and the pH value should remain within 7,0 ± 1,0. 9.20.1.2 Severity The cycles are effected under the following conditions: 9.20.1.3 Testing procedure The test procedure shall be in accordance with clause 4 of IEC 60068-2-30 and with IEC 60068-2-28. a) Initial verification b) Conditioning c) 24-hour cycle (see Figure 20) |
| 53 | 9.20.1.4 Recovery At the end of the cycles the RCM shall not be removed from the test chamber. The door of the test chamber shall be opened and the temperature and humidity regulation is stopped. A period of 4 h to 6 h shall then elapse to permit the ambient conditions (temperature and humidity) to be re-established before making the final measurement. During the 28 cycles the RCM shall not actuate. 9.20.1.5 Final verification Under the conditions of tests specified in 9.9.2 c), the RCM shall actuate with a test current of 1,25 I%n. One test only is made on one phase taken at random, without measurement of actuating time. 9.20.2 Test with temperature of 40 ˚C The RCM is mounted as for normal use on a dull black painted plywood wall, about 20 mm thick. For each phase, a single-core cable, 1 m long and having a nominal cross-sectional area as specified in Table 3, is connected on… The RCM is loaded with a current equal to rated current at any convenient voltage and is subjected, at a temperature of 40 ˚C ± … For four-path RCMs only three paths are loaded. At the end of the last period of 21 h with current passing, the temperature rise of the terminals is determined by means of fine wire thermocouples; this temperature rise shall not exceed 65 K. After this test the RCM, in the cabinet, is allowed to cool down to approximately room temperature without current passing. Under the conditions of tests specified in 9.9.2 c), the RCM shall actuate with a test current of 1,25 I%n. One test only is made on one phase taken at random without measurement of actuating time. 9.21 Verification of ageing of electronic components The RCM is placed for a period of 168 h in an ambient temperature of 40 ˚C ± 2 ˚C and loaded with the rated current. The supply voltage on the electronic parts shall be 1,1 times the rated voltage. After this test, the RCM in the cabinet is allowed to cool down to approximately room temperature without current passing. The electronic parts shall show no damage. Under the conditions of tests specified in 9.9.2 c), the RCM shall actuate with a test current of 1,25 I%n. One test only is made on one phase taken at random without measurement of actuating time. |
| 54 | 9.22 Verification of EMC requirements !Acceptance criteria as applicable to the tests of Table 15. For the purposes of this standard the acceptance criteria of the IEC 61000 series are replaced for each test as follows: Test Acceptance criteria T 2.1 During the test the RCM shall not switch to the alarm state for a continuously applied residual current of 0,3 I%n and shall switch to the alarm state for a continuously applied residual current of 1,25 I%n. T 2.2 During this test the RCM shall not switch to the sustained alarm state in response to the disturbance. However, a momentar… T 2.3 During this test the RCM shall not switch to the sustained alarm state in response to the disturbance. However, a momentar… T 2.5 During this test the RCM shall not switch to the alarm state for a continuously applied residual current of 0,3 I%n and shall switch to the alarm state for a continuously applied residual current of 1,25 I%n. T 3.1 During this test the RCM may switch to the alarm state. After the test the RCM shall be capable of performing satisfactorily the tests specified in items a), b) and c) of 9.9.2. 9.23 Response of the RCM to temporary overvoltages on the LV-side, due to fault conditions on the HV-side For devices with functional earth connection (FE), the following test shall be applied: A test voltage of 1 200 V + Uo at power frequency is applied for 5 s between all live terminals (Phases and Neutral) connected t… |
| 55 | Figure 1 – Standard test finger (9.6) |
| 56 | ! Figure 2a – Test circuit for the verification of the operating characteristics for RCMs for use in TN and TT-systems ” |
| 57 | ! Figure 2b – Test circuit for the verification of directional discrimination in IT systems for RCMs classified according to 4.11 ” |
| 58 | Figure 3 – Test circuit for the verification of the correct operation of RCMs in the case of residual pulsating direct currents Figure 4 – Test circuit for the verification of the correct operation of RCMs in the case of residual pulsating direct currents superimposed by smooth direct current of 0,006 A |
| 59 | ! Figure 5 – Test circuit for the verification of the co-ordination with a SCPD of a RCM with two current paths (9.11) ” |
| 60 | ! Figure 6 – Test circuit for the verification of the co-ordination with a SCPD of a RCM with three current paths in a three phase circuit (9.11) ” |
| 61 | ! Figure 7 – Test circuit for the verification of the co-ordination with a SCPD of a RCM with four current paths on a three-phase circuit with neutral (9.11) ” |
| 62 | Figure 8 – Test apparatus for the verification of the minimum I2t and Ip values to be withstood by the RCM [9.11.2.1 a)] |
| 63 | Figure 9 – Mechanical impact test apparatus (9.12.1) |
| 64 | Figure 10 – Striking element for pendulum impact test apparatus (9.12.1) Figure 11 – Mounting support for sample for mechanical impact test (9.12.1) |
| 65 | Figure 12 – Example of mounting an unenclosed RCM for mechanical impact test (9.12.1) |
| 66 | Figure 13 – Example of mounting of panel mounting type RCM for the mechanical impact test (9.12.1) |
| 67 | Figure 14 – Application of force for mechanical test of rail-mounted RCM (9.12.2) Figure 15 – Ball-pressure test apparatus (9.13.2) |
| 68 | ! Figure 16a Test circuit for the verification of the limiting value of overcurrent in the case of single phase load through a three-phase RCM Figure 16b Test circuit for the verification of the limiting value of overcurrent in the case of single phase load through an RCM with an external detecting device ” |
| 69 | Figure 17 – Current ring wave 0,5 4s/100 kHz Figure 18 – Test circuit for the ring-wave test at RCMs |
| 70 | Figure 19 – Stabilizing period for reliability test (9.20.1.3) |
| 71 | Figure 20 – Reliability test cycle (9.20.1.3) |
| 72 | Figure 21 – Example for test circuit for verification of ageing of electronic components (9.21) !The following Figure 22a and Figure 22b are representative of RCMs covered by this standard. RCMs can be divided into two distinct categories: a) those to which the monitored lines are not connected (4.9.1); b) those to which the monitored lines are connected (4.9.2). The RCM may use an internal or an external CT or have facility for selecting an internal or external CT for monitoring purposes as shown below, depending on the design.” |
| 73 | ! Figure 22a – RCMs without monitored lines connected Figure 22b – RCMs with monitored lines connected ” |
| 74 | ! The verification of conformity may be made A.1 Test sequences The tests are made according to Table A.1 of this annex, where the tests in each sequence are carried out in the order indicated. Table A.1 – Test sequences 9.3 9.4 9.5 9.6 9.10 9.13 8.1.3 9.14 Generala Indelibility of marking Reliability of screws, current-carrying parts and connections Reliability of terminals for external connections Protection against electric shock Operational endurance Resistance to heat Clearances and creepage distances Resistance to abnormal heat and fire 9.8 9.18 9.20.2 9.21 Temperature rise Resistance of insulation against impulse voltages Reliability at 40 ˚C Ageing of components C 9.17 9.19 9.15 9.12 9.16 Unwanted tripping d.c. components Test device Resistance to mechanical impact Non-operating current under overcurrent condition a General consists of inspections and measurements contained in 8.1.1 and 8.1.2. Individual tests to these subclauses may be performed at any convenient place within the test sequence A. ” |
| 75 | !A.2 Number of samples to be submitted for full test procedure If only one type of RCM, of one current rating and one residual operating current rating is submitted for the test, the number o… If all samples according to the second column of Table A.2 pass the tests, compliance with the standard is met. If the minimum n… Table A.2 – Number of samples submitted to tests Bd C D E F G H 2 2 2 2 2 2 2 1 1e 1e 1e 1 1 1 2 2 2 2 2 2 2 a In total a maximum of three test sequences may be repeated. b It is assumed that a sample which has not passed the test has not met the requirements due to workmanship or assembly defects which are not representative of the design. c In the case of repeated tests, all the tests shall be passed successfully. d If dismantling for test purposes is necessary, one more sample may be required. In this case the manufacturer shall supply samples, which may be specially prepared. e All samples shall meet the requirements in 9.9.2 and 9.9.3 as appropriate. In addition permanent arcing shall not occur in any sample during the tests of 9.11.2.2a) or 9.11.2.2 b). A.3 Number of samples to be submitted for simplified test procedures in the case of simultaneous submission of a range of RCMs of the same fundamental design A.3.1 If a range of RCMs of the same fundamental design, or additions to such a range of RCMs are submitted for certification, the number of samples to be tested may be reduced according to Table A.3. RCMs can be considered to be of the same fundamental design if the conditions from a) to i) inclusive are satisfied: a) they have the same basic design, e.g. types dependent on line voltage and types dependent on other energy source shall not occur together in the same range; b) the residual current operating means have identical actuating functions and identical relays etc. except for the variations permitted in 3) and 4) below; c) the materials, finish and dimensions of the internal current-carrying parts are identical other than the variations detailed in 1) below; d) the terminals are of similar design [see 2) below] for RCMs classified according to 4.11.2; e) the manual operating mechanism, materials and physical characteristics are identical; f) the moulding and insulating materials are identical; g) the basic design of the residual current sensing device is identical for a given kind of characteristic other than the variations permitted in 3) below; h) the basic design of the residual current actuating device is identical except for the variations permitted in 4) below; i) the basic design of the test device is identical except for the variations permitted in 5) below.” |
| 76 | !The following variations are permitted provided that the RCMs comply in all other respects with the requirements detailed above: 1) cross-sectional area of the internal current-carrying connecting means and length of the toroid connections; 2) size of terminals; 3) number of turns and cross-sectional area of the windings and the size and material of the core of the differential transformer; 4) sensitivity of the relay and/or the associated electronic circuit, if any; 5) the ohmic value of the means to produce the maximum ampere turns necessary to comply with for the test of 9.15. The circuit may be connected across phases or phase to neutral. A.3.2 For RCMs of the same classification regarding 4.7 and 4.11 and of the same fundamental design, having different current rating and rated residual current, the number of samples to be tested may be reduced according to Table A.3. Table A.3 – Tests with reduced number of samples min. rating I%n min. rating I%n 1 max. rating In min. rating I%n min. rating I%n min. rating I%n min. rating I%n min. rating I%n min. rating I%n 1 for all other ratings of I%n min. rating I%n min. rating I%n min. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n min. rating I%n 2 min. rating Ind max. rating I%n a If a test is to be repeated according to the minimum performance criteria of Clause A.2, a new set of samples is used for the relevant test. In the repeated test all test results must be acceptable. b If only 3-pole or 4-pole RCMs are submitted, this column shall also apply to a set of samples with the smallest number of paths. c This column is omitted when 4-path RCMs have been tested. d If only one value of I%n is submitted, these sets of samples are not required. ” |
| 77 | In determining clearances and creepage distances, the following points shall be considered. If a clearance or creepage distance is influenced by one or more metal parts, the sum of the sections shall have at least the prescribed minimum value. Individual sections of less than 1 mm in length should not be taken into consideration in the calculation of the total length of clearances and creepage distances. In determining creepage distance The application of the foregoing recommendations is illustrated as follows: |
| 78 | Figure B.1 Figure B.2 Figure B.3 Figure B.4 Figure B.5 Figure B.6 A = insulating material C = conducting part F = creepage distance Figure B.1 to Figure B.10 – Illustrations of the application of creepage distances |
| 79 | Figure B.7 Figure B.8 Figure B.9 Figure B.10 A = insulating material C = conducting part F = creepage distance Figure B.1 to Figure B.10 – Illustrations of the application of creepage distances (concluded) This European Standard incorporates by dated or undated reference, provisions from other publications. These normative reference… Part 101: Mathematics a The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems. b The European Standard EN 61008-1:1994 (IEC 61008-1:1990 + A1:1992, mod.) + corrigendum December 1997 + A2:1995 (IEC/A2:1995) + A11:1995 + A12:1998 + corrigendum April 1998 + A13:1998 + A14:1998 applies. c EN 45020 is superseded by EN 45020:1998 which is based on ISO/IEC Guide 2:1996. |
| 80 | Insulation coordination for equipment within low-voltage systems Part 3: Use of coating, potting or moulding for protection against pollution 2003 b Part 2: Tests – Guidance for damp heat tests Part 4: Protection for safety Chapter 44: Protection against overvoltages Section 443: Protection against overvoltages of atmospheric origin or due to switching Part 2: Symbol originals Part 1: Principles, requirements and tests + corr. November 1996 Part 2: Test methods Section 1/sheet 0: Glow-wire test methods General Part 1: General rules Part 8: Insulation monitoring devices for IT systems a The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems. b The European Standard EN 61008-1:1994 (IEC 61008-1:1990 + A1:1992, mod.) + corrigendum December 1997 + A2:1995 (IEC/A2:1995) + A11:1995 + A12:1998 + corrigendum April 1998 + A13:1998 + A14:1998 applies. c EN 45020 is superseded by EN 45020:1998 which is based on ISO/IEC Guide 2:1996. |
| 81 | Electromagnetic compatibility – Requirements for household appliances, electric tools and similar apparatus Part 1: Emission a The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems. b The European Standard EN 61008-1:1994 (IEC 61008-1:1990 + A1:1992, mod.) + corrigendum December 1997 + A2:1995 (IEC/A2:1995) + A11:1995 + A12:1998 + corrigendum April 1998 + A13:1998 + A14:1998 applies. c EN 45020 is superseded by EN 45020:1998 which is based on ISO/IEC Guide 2:1996. |
| 82 | BS EN 62020:1999 IEC 62020:1998 BSI 389 Chiswick High Road London W4 4AL BSI – British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an ina… BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 89… In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical… Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase pri… Information regarding online access to British Standards via British Standards Online can be found at http://www.bsi-global.com/bsonline. Further information about BSI is available on the BSI website at http:// www.bsi-global.com. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international st… This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size,… Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: [email protected]. |
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