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BS EN IEC 62020-1:2021

BS EN IEC 62020-1:2021

$215.11

Electrical accessories. Residual current monitors (RCMs) – RCMs for household and similar uses

Published By Publication Date Number of Pages
BSI 2021 122
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This document applies to residual current monitors for household and similar purposes, having rated operational voltages and a rated voltage of the monitored circuit not exceeding 440 V AC and rated currents not exceeding 125 A.

NOTE 1 The standard for residual current monitors having rated operational voltages and a rated voltage of the monitored circuit exceeding 440 V AC is in preparation, as IEC 62020-2.

RCMs 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 document are not intended to be used as protective devices.

RCMs detect residual currents circulating in an AC circuit (e.g. residual alternating current, residual pulsating direct current, residual smooth direct current), whether suddenly applied or slowly rising.

NOTE 2 RCMs for DC systems are under consideration.

This document applies to monitors performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating current of the device and providing the specified warning signal(s) when the residual current exceeds this value.

RCMs supplied by internal batteries are not covered by this document.

The requirements of this document apply for standard conditions (see 7.1). Additional requirements can be necessary for RCMs used in locations having severe environmental conditions.

RCMs are intended for use in an environment with pollution degree 2 and overvoltage category III. For an environment with a higher pollution degree, enclosures giving the appropriate degree of protection are used.

RCMs in compliance with this document are suitable for use in TN, TT, and IT systems.

This document does not cover Insulation Monitoring Devices (IMDs), which are covered by the scope of IEC 61557-8.

kNOTE 3 An RCM is distinguished from an IMD in that it is passive in its monitoring function and only responds to an unbalanced fault current in the installation being monitored. An IMD is active in its monitoring and measuring functions in that it can measure the balanced and unbalanced insulation resistance or impedance in the installation (see IEC 61557-8).

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
13 English
CONTENTS
19 FOREWORD
21 INTRODUCTION
22 1 Scope
23 2 Normative references
24 3 Terms and definitions
26 4 Classification
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
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
27 4.9.2 RCM to which the monitored line is directly connected
4.10 According to fault indicating means
4.11 According to ability to directionally discriminate between supply-side andload-side residual currents
4.12 According to the supply system
4.12.1 RCM for use in AC supply systems
4.12.2 RCM for use in DC supply systems
4.13 According to the type of residual current monitored
4.14 According to the method of residual current detection
5 Characteristics of RCMs
5.1 Summary of characteristics
28 5.2 Rated quantities and other characteristics
5.2.1 Rated voltage
5.2.2 Rated current (In)
5.2.3 Rated residual operating current (IΔn)
29 5.2.4 Rated residual non-operating current (IΔno)
5.2.5 Rated frequency
5.2.6 Operating characteristics
5.3 Standard and preferred values
5.3.1 Preferred values of rated voltage (Ue)
30 5.3.2 Preferred values of rated current (In)
5.3.3 Preferred values of rated residual operating current (IΔn)
5.3.4 Standard value of residual non-operating current (IΔno)
5.3.5 Standard minimum value of the non-operating overcurrent in the case of single-phase load through an RCM
5.3.6 Preferred values of rated frequency
5.3.7 Standard and preferred values of the rated conditional short-circuit current (Inc) (only applicable to RCMs classified according to 4.9.2)
31 5.3.8 Maximum actuating time (Tmax)
5.3.9 Minimum non-actuating time (Tmin)
5.4 Coordination with short-circuit protective devices (SCPDs) (only valid for RCMs classified according to 4.9.2)
5.4.1 General
5.4.2 Rated conditional short-circuit current (Inc)
5.4.3 Rated conditional residual short-circuit current (IΔc)
6 Marking and other product information
32 Tables
Table 1 – Marking
34 7 Standard conditions for operation in service and for installation
7.1 Standard conditions
35 7.2 Conditions of installation
8 Requirements for construction and operation
8.1 Mechanical design
8.1.1 General
8.1.2 Features
Table 2 – Standard conditions for operation in service
36 8.1.3 Clearances and creepage distances
37 8.1.4 Screws, current-carrying parts and connections
Table 3 – Clearances and creepage distances
38 8.1.5 Terminals for external conductors
39 Table 4 – Connectable cross-sections of copper conductors for screw-type terminals
40 8.2 Protection against electric shock
41 8.3 Dielectric properties
8.4 Temperature rise
8.4.1 General
8.4.2 Temperature rise limits
42 8.4.3 Ambient air temperature
8.5 Operating characteristic
8.6 Directional discrimination
8.7 Operational endurance
8.8 Performance at short-circuit currents
8.9 Resistance to mechanical impact
Table 5 – Temperature rise values
43 8.10 Resistance to heat
8.11 Resistance to abnormal heat and to fire
8.12 Test device
8.13 Correct operation of RCMs within the supply voltage range
8.14 Behaviour of RCMs in case of overcurrents in the main circuit
44 8.15 Resistance of RCMs to unwanted initiating of an alarm due to current surges caused by impulse voltages
8.16 Behaviour of RCMs in case of earth fault currents comprising DC components
8.17 Reliability
8.18 Electromagnetic compatibility (EMC)
8.18.1 General
8.18.2 Immunity requirements
8.18.3 Emission requirements
8.19 Connection of an external current transformer (CT)
8.20 Response to temporary overvoltages on the LV side due to fault conditions on the HV side
45 9 Tests
9.1 General
Table 6 – List of type tests depending on RCM classification
46 9.2 Test conditions
9.3 Test of indelibility of marking
Table 7 – Test copper conductors corresponding to the rated currents
47 9.4 Test of reliability of screws, current-carrying parts and connections
Table 8 – Screw thread diameters and applied torques
48 9.5 Test of reliability of terminals for external conductors
Table 9 – Pulling forces
49 9.6 Verification of protection against electric shock
Table 10 – Conductor dimensions
50 9.7 Test of dielectric properties
9.7.1 Resistance to humidity
9.7.2 Insulation resistance of the main circuits of RCMs classified according to 4.9.2
51 9.7.3 Dielectric strength of the main circuit of RCMs classified according to 4.9.2
52 9.7.4 Insulation resistance and dielectric strength of control and auxiliary circuits
Table 11 – Test voltage of control and auxiliary circuits
53 9.7.5 Secondary circuit of detection transformers
9.7.6 Capability of the RCM to withstand high DC voltages due to insulation measurements
9.7.7 Verification of impulse withstand voltages
55 9.8 Test of temperature rise
9.8.1 Ambient air temperature
9.8.2 Test procedure
Table 12 – Rated impulse withstand voltage as a functionof the nominal voltage of the installation
Table 13 – Test voltage for verification of impulse withstand voltage
56 9.8.3 Measurement of the temperature rise of parts
9.8.4 Temperature rise of a part
9.9 Verification of the operating characteristics
9.9.1 Test circuit
9.9.2 Off-load tests with residual sinusoidal alternating currents at the reference temperature of 20 °C ± 2 °C
57 9.9.3 Verification of the correct operation with load at the reference temperature
9.9.4 Verification of the connection and the function of an external currenttransformer (CT)
58 9.9.5 Verification of directional discrimination for RCMs classified according to 4.11
59 9.10 Verification of operational endurance
9.10.1 General
9.10.2 Test procedure
9.11 Verification of short-circuit withstand capability
9.11.1 List of the short-circuit tests
9.11.2 Short-circuit tests
60 Table 14 – Silver wire diameter as a function of rated current and short-circuit currents
61 Table 15 – Minimum values of I2t and Ip
62 Table 16 – Power factors for short-circuit tests
64 9.12 Verification of resistance to mechanical impact
9.12.1 General
9.12.2 Test for all RCM types
66 9.12.3 Rail-mounted RCMs
9.12.4 Plug-in type RCMs
9.13 Test of resistance to heat
67 9.14 Test of resistance to abnormal heat and to fire
68 9.15 Verification of the operation of the test device at the limits of rated voltage
9.16 Verification of limiting values of the non-operating current under overcurrent conditions
9.16.1 General
9.16.2 Verification of the limiting value of overcurrent in the case of a load through an RCM with two current paths
69 9.16.3 Verification of the limiting value of overcurrent in the case of a single-phase load through a three-pole or four-pole RCM
9.16.4 Verification of the limiting value of overcurrent in the case of a single-phase load through an RCM with an external detecting device (transformer)
70 9.17 Verification of resistance against unwanted operation due to current surges caused by impulse voltages
9.18 Void
9.19 Additional verification of the correct operation at residual currents with DC components
9.19.1 General
71 Table 17 – Overview of test details for the RCM types
72 9.19.2 Verification of the correct operation for RCM Type A, Type F and Type B
Table 18 – Actuating current ranges
73 9.19.3 Verification of correct operation for RCM Type F and Type B
Table 19 – Frequency component values of test currentsand starting current values for verifying operating
Table 20 – Operating current ranges for composite residual current
74 9.19.4 Verification of correct operation for RCM Type B
75 Table 21 – Residual non-operating and operating current according to frequenciesthat differ from the rated frequency 50/60 Hz for RCM Type B
77 9.20 Verification of reliability
9.20.1 General
9.20.2 Climatic test
79 9.20.3 Test with temperature of 40 °C
9.21 Verification of ageing of electronic components
9.22 Verification of EMC requirements
9.22.1 General
80 Table 22 – EMC tests
81 9.22.2 Description of quiescent mode and operate mode
9.22.3 Criterion A1
9.22.4 Criterion A2
9.22.5 Criterion B
82 9.23 Response of the RCM to temporary overvoltages on the LV side, due to fault conditions on the HV side
9.24 Test of resistance to rusting
83 Figures
Figure 1 – Standing current in FE conductor
84 Figure 2 – Standard test finger (9.6)
85 Figure 3 – Test circuit for verification of the operating characteristics for RCMs
86 Figure 4 – Test circuit for verification of directional discriminationin IT systems for RCMs classified according to 4.12
87 Figure 5 – Test circuit for verification of the correct operation of RCMsin the case of residual pulsating direct currents
88 Table 23 – Explanation of letter symbols used in Figure 6 to Figure 9
89 Figure 6 – Test circuit for verification of the correct operation of RCMsin the case of residual pulsating direct currents superimposedby smooth direct current of 0,006 A
90 Figure 7 – Test circuit for verification of the coordination with an SCPDof an RCM with two current paths (9.11)
91 Figure 8 – Test circuit for verification of the coordination with an SCPD of an RCMwith three current paths in a three-phase circuit (9.11)
92 Figure 9 – Test circuit for verification of the coordination with an SCPD of an RCMwith four current paths on a three-phase circuit with neutral (9.11)
93 Figure 10 – Test apparatus for verification of the minimum I2t and Ip valuesto be withstood by the RCM (9.11.2.1 a))
94 Figure 11 – Mechanical impact test apparatus (9.12.2)
95 Figure 12 – Striking element for pendulum impact test apparatus (9.12.2)
96 Figure 13 – Mounting support for sample for mechanical impact test (9.12.2)
97 Figure 14 – Example of mounting an unenclosed RCMfor mechanical impact test (9.12.2)
98 Figure 15 – Example of mounting of panel mounting type RCMfor the mechanical impact test (9.12.2)
99 Figure 16 – Application of force for mechanical test of rail-mounted RCM (9.12.3)
Figure 17 – Ball-pressure test apparatus (9.13.3)
100 Figure 18 – Test circuit for verification of the limiting value of overcurrentin the case of single-phase load
101 Figure 19 – Current ring wave 0,5 µs/100 kHz
Figure 20 – Test circuit for the ring-wave test of RCMs
102 Figure 21 – Stabilizing period for reliability test (9.20.2.4)
103 Figure 22 – Reliability test cycle (9.20.2.4)
104 Figure 23 – Example test circuit for verificationof ageing of electronic components (9.21)
105 Figure 24 – RCMs without monitored lines connected
Figure 25 – RCMs with monitored lines connected
106 Figure 26 – Example of a test circuit for verification of correct operation in case of residual sinusoidal alternating currents composed of multi-frequency components resulting from single-phase supplied speed motor control equipment
107 Figure 27 – Test circuit for verification of correct operation in case of residual sinusoidal alternating current up to 1 000 Hz
108 Figure 28 – Test circuit for 2-,3- and 4-pole RCM Type B to verify the correct operationin case of residual pulsating direct currents which may resultfrom rectifying circuits supplied from two phases
109 Figure 29 – Test circuit for 3- and 4-pole RCM Type B to verify the correct operationin case of residual pulsating direct currents which may resultfrom rectifying circuits supplied from three phases
110 Figure 30 – Test circuit for 2-, 3- and 4-pole RCM Type Bto verify the correct operation in case ofa residual smooth direct current
111 Figure 31 – Diagrammatic representation for glow-wire test
112 Figure 32 – Test circuit for 2-, 3- and 4-pole RCM Type B to verify the correct operationin case of a residual alternating current superimposedon a smooth direct current
113 Annex A (normative)Test sequence and number of samples to be submitted for verification of conformity to this document
A.1 General
A.2 Test sequences
Table A.1 – Test sequences
114 A.3 Number of samples to be submitted for full test procedure
A.4 Number of samples to be submitted for simplified test procedures in case of submitting simultaneously a range of RCMs of the same fundamental design
Table A.2 – Number of samples submitted to tests
116 Table A.3 – Tests with a reduced number of samples
117 Annex B (normative)Determination of clearances and creepage distances
118 Figure B.1 – Illustrations of the application of creepage distances
119 Figure B.2 – Illustrations of the application of creepage distances
120 Bibliography

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BS EN IEC 62020-1:2021
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