This part of IEC 61558 deals with safety aspects of transformers, reactors, power supply units and combinations thereof such as electrical, thermal and mechanical safety.<\/p>\n
This document covers the following independent<\/b> or associated<\/b> stationary or portable types of dry-type transformers, power supply units,<\/b> including switch mode power supply units, reactors<\/b> and combinations thereof in the field of safety. The windings can be encapsulated or non-encapsulated. They are not forming a part of the distribution network.<\/p>\n NOTE 1 The distinction between transformers, power supply units and switch mode power supply units is as follows:<\/p>\n<\/blockquote>\n for transformers<\/b>, there is no change in frequency. However, transformers<\/b> (e.g. constant voltage transformers) can have an internal resonance frequency not exceeding 30 kHz;<\/p>\n<\/li>\n for power supply units,<\/b> the internal operational frequency<\/b> and waveform are different from the supply frequency<\/b> and waveform, and the internal operational frequency does not exceed 500 Hz (see definition 3.1.19);<\/p>\n<\/li>\n for switch mode power supply units,<\/b> the internal operational frequency<\/b> and waveform are different from the supply frequency<\/b> and waveform and the internal operational frequency<\/b> exceeds 500 Hz and does not exceed 100 MHz.<\/p>\n<\/li>\n<\/ul>\n The relevant parts of IEC 61558-2 can be found in the introduction of this document.<\/p>\n<\/blockquote>\n Stationary or portable, single-phase or poly-phase, air-cooled (natural or forced), isolating<\/b> and safety isolating transformers, independent<\/b> or associated<\/b> with the following characteristics:<\/p>\n rated supply voltage<\/b> not exceeding 1 000 V AC;<\/p>\n<\/li>\n rated supply frequency<\/b> not exceeding 500 Hz;<\/p>\n<\/li>\n<\/ul>\n and complying with the following values, unless otherwise specified in the relevant part of IEC 61558-2:<\/p>\n for isolating transformers:<\/b><\/p>\n rated output for single phase transformers,<\/b> not exceeding 25 kVA, and for polyphase transformers<\/b> not exceeding 40 kVA;<\/p>\n<\/li>\n no-load output voltage<\/b> and the rated output voltage<\/b> exceeding 50 V AC, and not exceeding 500 V a.c, or 1 000 V AC to be in accordance with the national wiring rules or for a special application.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/li>\n for safety isolating transformers:<\/b><\/p>\n rated output for single phase transformers<\/b> not exceeding 10 kVA, and for polyphase transformers<\/b> not exceeding 16 kVA;<\/p>\n<\/li>\n no-load output voltage<\/b> and the rated output voltage<\/b> not exceeding 50 V AC between conductors, or between any conductor and protective earthing.<\/p>\n<\/li>\n<\/ul>\n NOTE 2 Isolating<\/b> and safety isolating transformers<\/b> are used where double<\/b> or reinforced insulation<\/b> between circuits is required by the installation rules or by the appliance specification (for example toys, bells, portable tools<\/b>, handlamps).<\/p>\n<\/blockquote>\n<\/li>\n Stationary<\/b> or portable,<\/b> single-phase or polyphase, air-cooled (natural or forced) separating transformers, auto-transformers, variable transformers<\/b> and small reactors, independent<\/b> or associated<\/b> with the following characteristics:<\/p>\n rated supply voltage<\/b> not exceeding 1 000 V AC;<\/p>\n<\/li>\n rated supply frequency<\/b> not exceeding 500 Hz;<\/p>\n<\/li>\n<\/ul>\n and complying with the following values, unless otherwise specified in the relevant part of IEC 61558-2:<\/p>\n no-load output voltage or a rated output voltage for both independent and associated transformers<\/b> not exceeding 15 kV AC, and for independent transformers<\/b>, a rated output voltage not less than 50 V AC;<\/p>\n<\/li>\n rated output<\/b> not exceeding the following values:<\/p>\n 1 kVA for single-phase transformers<\/b>;<\/p>\n<\/li>\n 2 kVAR for single-phase reactors<\/b>;<\/p>\n<\/li>\n 5 kVA for polyphase transformers<\/b>;<\/p>\n<\/li>\n 10 kVAR for polyphase reactors.<\/b><\/p>\n<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n NOTE 3 Separating transformers<\/b> are used where double<\/b> or reinforced<\/b> insulation between circuits is not required by the installation rules or by the appliance specification.<\/p>\n<\/blockquote>\n NOTE 4 Normally, the transformers<\/b> of type b) are intended to be associated with the equipment to provide voltages different from the supply voltage for the functional requirements of the equipment. The protection against electric shock can be provided or completed by other features of the equipment, such as the body. Parts of output circuits can be connected to the input circuit or to the protective earthing.<\/p>\n<\/blockquote>\n<\/li>\n Stationary<\/b> or portable,<\/b> single-phase or polyphase, air-cooled (natural or forced), independent<\/b> or associated power supply units<\/b> and switch mode power supply units<\/b> incorporating one or more transformer(s)<\/b> of type a) or b) with the following characteristics:<\/p>\n rated supply voltage<\/b> not exceeding 1 000 V AC;<\/p>\n<\/li>\n rated supply frequency<\/b> not exceeding 500 Hz;<\/p>\n<\/li>\n internal operational frequency for power supply units not exceeding 500 Hz and for switch mode power supply units not exceeding 100 MHz;<\/p>\n<\/li>\n<\/ul>\n and with the following values, unless otherwise specified in the relevant part of IEC 61558- 2:<\/p>\n for power supply units and switch mode power supply units incorporating isolating transformers:<\/b><\/p>\n rated output<\/b> for single- phase or polyphase power supply units<\/b> or switch mode power supply units<\/b> not exceeding 1 kVA;<\/p>\n<\/li>\n no-load output voltage<\/b> and the rated output voltage<\/b> exceeding 50 V AC or 120 V ripple-free DC, and not exceeding 500 V AC or 708 V ripple-free DC, or 1 000 V AC or 1 415 V ripple- free DC to be in accordance with national wiring rules or for a special application;<\/p>\n<\/li>\n<\/ul>\n<\/li>\n for power supply units<\/b> and switch mode power supply units<\/b> incorporating safety isolating transformers:<\/b><\/p>\n rated output<\/b> for single- phase or polyphase power supply units<\/b> and switch mode power supply units<\/b> not exceeding 1 kVA;<\/p>\n<\/li>\n no-load output voltage and rated output voltage<\/b> not exceeding 50 V AC or 120 V ripple-free DC between conductors, or between any conductor and protective earthing.<\/p>\n<\/li>\n<\/ul>\n NOTE 5 Power supply units<\/b> and switch mode power supply units<\/b> incorporating isolating<\/b> and safety isolating transformers<\/b> are used where double<\/b> or reinforced insulation<\/b> between circuits is required by the installation rules or by the appliance specification (for example toys, bells, portable tools, handlamps).<\/p>\n<\/blockquote>\n<\/li>\n for power supply units<\/b> and switch mode power supply units<\/b> incorporating separating transformers,<\/b> auto-transformers<\/b> , and variable transformers<\/b>:<\/p>\n rated output<\/b> for single-phase or polyphase power supply units<\/b> and switch mode power supply units<\/b> not exceeding 1 kVA;<\/p>\n<\/li>\n no-load output voltage<\/b> and rated output voltage<\/b> for both, independent<\/b> and associated transformers<\/b> not exceeding 15 kV AC, and for independent transformers,<\/b> a rated output voltage<\/b> not less than 50 V AC.<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n NOTE 6 Power supply units and switch mode power supply units incorporating separating transformers are used where double or reinforced insulation between circuits is not required by the installation rules or by the appliance specification.<\/p>\n<\/blockquote>\n<\/li>\n<\/ol>\n This document also applies to transformers, power supply units, switch mode power supply units<\/b> and reactors<\/b> incorporating electronic circuits.<\/p>\n This document is applicable to transformers<\/b> without limitation of the rated output subject to an agreement between the purchaser and the manufacturer.<\/p>\n This document does not apply to external circuits and their components intended to be connected to the input or output terminals or socket-outlets of the transformers, power supply units<\/b> and switch mode power supply units,<\/b> and reactors.<\/b><\/p>\n Attention is drawn to the following:<\/p>\n for transformers<\/b> intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc…) may be necessary;<\/p>\n<\/li>\n measures to protect the enclosure<\/b> and the components inside the enclosure against external influences like fungus, vermin, termites, solar-radiation, and icing are considered;<\/p>\n<\/li>\n the different conditions for transportation, storage, and operation of the transformers<\/b> should also be considered;<\/p>\n<\/li>\n additional requirements in accordance with other appropriate standards and national rules can be applicable to transformers<\/b> intended for use in special environments, such as tropical environments.<\/p>\n<\/li>\n<\/ul>\n Future technological development of transformers<\/b> can necessitate a need to increase the upper limit of the frequencies; until then this document can be used as a guidance document.<\/p>\n Safety of transformers, reactors, power supply units and combinations thereof – General requirements and tests<\/b><\/p>\n\n
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PDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 2<\/td>\n undefined <\/td>\n<\/tr>\n \n 5<\/td>\n Annex ZA(normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n \n 11<\/td>\n Annex ZZ(informative)Relationship between this European standard and the safety objectives of Directive 2014\/35\/EU [2014 OJ L96] aimed to be covered <\/td>\n<\/tr>\n \n 13<\/td>\n English
CONTENTS <\/td>\n<\/tr>\n\n 20<\/td>\n FOREWORD <\/td>\n<\/tr>\n \n 22<\/td>\n INTRODUCTION <\/td>\n<\/tr>\n \n 23<\/td>\n Figures
Figure 1 \u2013 IEC 61558 principle <\/td>\n<\/tr>\n\n 25<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 27<\/td>\n 2 Normative references <\/td>\n<\/tr>\n \n 30<\/td>\n 3 Terms and definitions <\/td>\n<\/tr>\n \n 31<\/td>\n 3.1 Transformers <\/td>\n<\/tr>\n \n 34<\/td>\n 3.2 General terms <\/td>\n<\/tr>\n \n 35<\/td>\n 3.3 Operations and protections <\/td>\n<\/tr>\n \n 37<\/td>\n 3.4 Circuits and windings <\/td>\n<\/tr>\n \n 38<\/td>\n 3.5 Ratings <\/td>\n<\/tr>\n \n 40<\/td>\n 3.6 No-load values
3.7 Insulation <\/td>\n<\/tr>\n\n 44<\/td>\n 3.8 Touch current and protective earthing conductor current
4 General requirements <\/td>\n<\/tr>\n\n 45<\/td>\n 5 General notes on tests <\/td>\n<\/tr>\n \n 46<\/td>\n Figure 2 \u2013 Mounting box for flush-type transformer <\/td>\n<\/tr>\n \n 47<\/td>\n 6 Ratings
7 Classification <\/td>\n<\/tr>\n\n 48<\/td>\n 8 Marking and other information <\/td>\n<\/tr>\n \n 52<\/td>\n Tables
Table 1 \u2013 Symbols used on equipment or in instructions <\/td>\n<\/tr>\n\n 54<\/td>\n 9 Protection against electric shock
9.1 General <\/td>\n<\/tr>\n\n 55<\/td>\n 9.2 Protection against contact with hazardous-live-parts
9.2.1 Determination of hazardous-live-parts
9.2.2 Accessibility to hazardous-live-parts <\/td>\n<\/tr>\n\n 56<\/td>\n Figure 3 \u2013 Test pin (see IEC 61032, test probe 13) <\/td>\n<\/tr>\n \n 57<\/td>\n Figure 4 \u2013 Standard test finger (see IEC 61032, test probe B) <\/td>\n<\/tr>\n \n 58<\/td>\n 9.2.3 Accessibility to non hazardous-live-part
9.3 Protection against hazardous electrical discharge
10 Change of input voltage setting <\/td>\n<\/tr>\n\n 59<\/td>\n 11 Output voltage and output current under load <\/td>\n<\/tr>\n \n 60<\/td>\n 12 No-load output voltage
13 Short-circuit voltage
14 Heating
14.1 General requirements
14.1.1 Temperature-rise test <\/td>\n<\/tr>\n\n 62<\/td>\n 14.1.2 Alternative temperature-rise test <\/td>\n<\/tr>\n \n 64<\/td>\n Figure 5 \u2013 Example of back-to-back method \u2013 Single phase
Figure 6 \u2013 Example of back-to-back method \u2013 Three phase <\/td>\n<\/tr>\n\n 65<\/td>\n 14.1.3 Determination of steady-state conditions
Table 2 \u2013 Values of maximum temperatures in normal use <\/td>\n<\/tr>\n\n 66<\/td>\n 14.2 Application of 14.1 or 14.3 according to the insulation system
Table 3 \u2013 Explanation of the maximum winding temperatures required in Table 2 <\/td>\n<\/tr>\n\n 67<\/td>\n 14.3 Accelerated ageing test for undeclared class of insulation system
14.3.1 General
14.3.2 Heat run
Table 4 \u2013 Test temperature and testing time (in days) per cycle <\/td>\n<\/tr>\n\n 68<\/td>\n 14.3.3 Vibration
14.3.4 Moisture treatment
14.3.5 Measurements
15 Short circuit and overload protection
15.1 General requirements
15.1.1 Short circuit and overload test method <\/td>\n<\/tr>\n\n 70<\/td>\n Table 5 \u2013 Maximum values of temperatures under short-circuitor overload conditions <\/td>\n<\/tr>\n \n 71<\/td>\n 15.1.2 Alternative short circuit and overload test method
15.2 Inherently short-circuit proof transformers
15.3 Non-inherently short-circuit proof transformers
Table 6 \u2013 Values of T and k for fuses <\/td>\n<\/tr>\n\n 72<\/td>\n 15.4 Non-short-circuit proof transformers
15.5 Fail-safe transformers <\/td>\n<\/tr>\n\n 73<\/td>\n 16 Mechanical strength
16.1 General
16.2 Stationary transformers <\/td>\n<\/tr>\n\n 74<\/td>\n 16.3 Portable transformers (except portable transformers with integral pins for introduction in socket-outlet in the fixed wiring)
16.4 Portable transformers provided with integral pins for introduction in socket-outlets of the fixed wiring
16.4.1 General requirements <\/td>\n<\/tr>\n\n 75<\/td>\n 16.4.2 Portable transformers provided with integral pins according to EN 50075 (IEC plug type C) for introduction in socket-outlets of the fixed wiring
Table 7 \u2013 Pull force on pins <\/td>\n<\/tr>\n\n 76<\/td>\n 16.5 Additional requirements for transformers to be used in vehicles and railway applications
16.5.1 Transformers to be used in vehicles and railway applications
Table 8 \u2013 Conditions for vibration testing (random)
Table 9 \u2013 Amplitude spectrum density ASD values for accelerated life testing <\/td>\n<\/tr>\n\n 77<\/td>\n 16.5.2 Test requirements for the transportation of transformers
Figure 7 \u2013 Amplitude spectrum density for random testing
Table 10 \u2013 Frequency values depending on the weight of the specimen
Table 11 \u2013 Excitation values for vibration testing <\/td>\n<\/tr>\n\n 78<\/td>\n 17 Protection against harmful ingress of dust, solid objects and moisture
17.1 Degrees of protection provided by enclosures (IP code)
17.1.1 General requirements
Figure 8 \u2013 Normalised spectrum of shock <\/td>\n<\/tr>\n\n 79<\/td>\n 17.1.2 Tests on transformers with enclosure <\/td>\n<\/tr>\n \n 80<\/td>\n Table 12 \u2013 Solid-object-proof transformer test <\/td>\n<\/tr>\n \n 81<\/td>\n 17.2 Humidity treatment <\/td>\n<\/tr>\n \n 82<\/td>\n 18 Insulation resistance, dielectric strength and leakage current
18.1 General
18.2 Insulation resistance <\/td>\n<\/tr>\n\n 83<\/td>\n 18.3 Dielectric strength test
Table 13 \u2013 Values of insulation resistance <\/td>\n<\/tr>\n\n 84<\/td>\n Table 14 \u2013 Table of dielectric strength test voltages <\/td>\n<\/tr>\n \n 85<\/td>\n 18.4 Insulation between and within windings
18.5 Touch current and protective earthing conductor current
18.5.1 General
Figure 9 \u2013 Test voltage sequence <\/td>\n<\/tr>\n\n 86<\/td>\n 18.5.2 Touch current <\/td>\n<\/tr>\n \n 87<\/td>\n 18.5.3 Protective earthing conductor current
Figure 10 \u2013 Test configuration: single-phase equipment on star TN or TT system
Table 15 \u2013 Limits for currents <\/td>\n<\/tr>\n\n 88<\/td>\n 19 Construction
19.1 General construction
19.1.1 General
19.1.2 Auto-transformers <\/td>\n<\/tr>\n\n 89<\/td>\n 19.1.3 Separating transformers <\/td>\n<\/tr>\n \n 90<\/td>\n 19.1.4 Isolating transformers and safety isolating transformers <\/td>\n<\/tr>\n \n 92<\/td>\n 19.2 Flammability of materials
19.4 Class II transformer contact prevention of accessible conductive parts
19.5 Class II transformer insulation reassembling after service <\/td>\n<\/tr>\n\n 93<\/td>\n 19.6 Loosening of wires, screws or similar parts
19.7 Resistor or capacitor connection with accessible conductive parts
19.8 Bridging of separated conductive parts by resistors or capacitors <\/td>\n<\/tr>\n\n 94<\/td>\n 19.9 Insulating material separating input and output windings
19.10 Accidental contact protection against hazardous-live-parts provided by isolating coating <\/td>\n<\/tr>\n\n 95<\/td>\n 19.11 Insulating material of handles, operating levers, knobs and similar parts
19.12 Winding construction
Figure 11 \u2013 Abrasion resistance test for insulating coated layers <\/td>\n<\/tr>\n\n 99<\/td>\n 19.13 Fixing of handles, operating levers and similar parts
19.14 Fixing of covers providing protection against electric shock <\/td>\n<\/tr>\n\n 100<\/td>\n 19.15 Strain on fixed socket-outlets caused by pin-transformers connection
19.16 Portable transformers for use in irregular or harsh conditions
19.17 Drain hole of transformers protected against ingress of water
19.18 Plug connected transformers protected against ingress of water
19.19 Flexible cable or flexible cord connection for class I portable transformers
19.20 SELV- and PELV-circuit separation of live parts <\/td>\n<\/tr>\n\n 101<\/td>\n 19.21 Protection against contact for FELV-circuit
19.22 Protective earthing regarding class II transformers <\/td>\n<\/tr>\n\n 102<\/td>\n 19.23 Protective earthing regarding class III transformers
20 Components <\/td>\n<\/tr>\n\n 107<\/td>\n 21 Internal wiring
22 Supply connection and other external flexible cables or cords <\/td>\n<\/tr>\n\n 109<\/td>\n Table 16 \u2013 Nominal cross-sectional areas of external flexible cables or cords <\/td>\n<\/tr>\n \n 111<\/td>\n Figure 12 \u2013 Flexing test apparatus <\/td>\n<\/tr>\n \n 113<\/td>\n Table 17 \u2013 Pull and torque to be applied to external flexible cables or cords fixed to stationary and portable transformers <\/td>\n<\/tr>\n \n 114<\/td>\n 23 Terminals for external conductors <\/td>\n<\/tr>\n \n 115<\/td>\n 24 Provisions for protective earthing <\/td>\n<\/tr>\n \n 117<\/td>\n 25 Screws and connections <\/td>\n<\/tr>\n \n 118<\/td>\n Table 18 \u2013 Torque to be applied to screws and connections <\/td>\n<\/tr>\n \n 119<\/td>\n 26 Creepage distances, clearances and distances through insulation
26.1 General
Table 19 \u2013 Torque test on glands <\/td>\n<\/tr>\n\n 120<\/td>\n 26.2 Creepage distances and clearances
26.2.1 General
26.2.2 Windings covered with adhesive tape
26.2.3 Uncemented insulationing parts
26.2.4 Cemented insulating parts <\/td>\n<\/tr>\n\n 121<\/td>\n 26.2.5 Enclosed parts (e.g. by impregnation or potting) <\/td>\n<\/tr>\n \n 122<\/td>\n 26.3 Distance through insulation <\/td>\n<\/tr>\n \n 125<\/td>\n Figure 13 \u2013 Test arrangement for checking mechanical withstanding of insulating materials in thin sheet layers <\/td>\n<\/tr>\n \n 126<\/td>\n Table 20 \u2013 Clearances in mm <\/td>\n<\/tr>\n \n 127<\/td>\n Table 21 \u2013 Creepage distances in mm <\/td>\n<\/tr>\n \n 128<\/td>\n Table 22 \u2013 Distance through insulation in mm <\/td>\n<\/tr>\n \n 129<\/td>\n Table 23 \u2013 Creepage distances and clearance between terminals for external connection <\/td>\n<\/tr>\n \n 131<\/td>\n Table 24 \u2013 Values of FIW wires with minimum overall diameter and minimum test voltages according to the total enamel increase <\/td>\n<\/tr>\n \n 133<\/td>\n 27 Resistance to heat, fire and tracking
27.1 General
27.2 Resistance to heat
27.2.1 General
27.2.2 External accessible parts
Figure 14 \u2013 Ball-pressure apparatus <\/td>\n<\/tr>\n\n 134<\/td>\n 27.2.3 Internal parts
27.3 Resistance to abnormal heat under fault conditions <\/td>\n<\/tr>\n\n 135<\/td>\n 27.4 Resistance to fire
27.4.1 General <\/td>\n<\/tr>\n\n 136<\/td>\n 27.4.2 External accessible parts
27.4.3 Internal parts <\/td>\n<\/tr>\n\n 137<\/td>\n 27.5 Resistance to tracking
28 Resistance to rusting <\/td>\n<\/tr>\n\n 138<\/td>\n Annexes
Annex A (normative) Measurement of creepage distances and clearances
Figure A.1 \u2013 Example 1
Table A.1 \u2013 Width of groove values depending on the pollution degree <\/td>\n<\/tr>\n\n 139<\/td>\n Figure A.2 \u2013 Example 2
Figure A.3 \u2013 Example 3
Figure A.4 \u2013 Example 4 <\/td>\n<\/tr>\n\n 140<\/td>\n Figure A.5 \u2013 Example 5
Figure A.6 \u2013 Example 6 <\/td>\n<\/tr>\n\n 141<\/td>\n Figure A.7 \u2013 Example 7
Figure A.8 \u2013 Example 8 <\/td>\n<\/tr>\n\n 142<\/td>\n Annex B (normative) Testing a series of transformers
B.1 General
B.2 Requirements <\/td>\n<\/tr>\n\n 143<\/td>\n B.3 Constructional inspection <\/td>\n<\/tr>\n \n 144<\/td>\n Annex C (void) <\/td>\n<\/tr>\n \n 145<\/td>\n Annex D (void) <\/td>\n<\/tr>\n \n 146<\/td>\n Annex E (normative) Glow-wire test
E.1 General
E.2 Severity
E.3 Conditioning
E.4 Test procedure <\/td>\n<\/tr>\n\n 147<\/td>\n Annex F (normative) Requirements for manually operated switches which are parts of transformers assembly
F.1 General
F.2 Switches tested as a separate component
F.3 Switches tested as part of the transformer <\/td>\n<\/tr>\n\n 148<\/td>\n Table F.1 \u2013 Peak surge current of additional loads <\/td>\n<\/tr>\n \n 150<\/td>\n Annex G (normative) Tracking test
G.1 General
G.2 Test specimen
G.3 Test apparatus
G.4 Procedure <\/td>\n<\/tr>\n\n 151<\/td>\n Annex H (normative) Electronic circuits
H.1 General
H.2 General notes on tests (addition to Clause 5)
H.3 Short circuit and overload protection (addition to Clause 15) <\/td>\n<\/tr>\n\n 153<\/td>\n H.4 Creepage distances, clearances and distances through insulation (addition to Clause 26) <\/td>\n<\/tr>\n \n 154<\/td>\n Figure H.1 \u2013 Example of an electronic circuit with low-power points <\/td>\n<\/tr>\n \n 155<\/td>\n Annex I (informative) Dimensions for rectangular cross-section connectors of transformers, basic dimensions and coordination
Table I.1 \u2013 Dimensions of rectangular copper connectors <\/td>\n<\/tr>\n\n 157<\/td>\n Annex J (normative) Measuring network for touch-currents
Figure J.1 \u2013 Measuring network for touch-current <\/td>\n<\/tr>\n\n 158<\/td>\n Annex K (normative) Insulated winding wires
K.1 General
K.2 Type tests
K.2.1 General
K.2.2 Dielectric strength test
K.2.3 Flexibility and adherence <\/td>\n<\/tr>\n\n 159<\/td>\n K.2.4 Heat shock
K.2.5 Retention of dielectric strength after bending
Table K.1 \u2013 Mandrel diameter
Table K.2 \u2013 Oven temperature <\/td>\n<\/tr>\n\n 160<\/td>\n K.3 Testing during manufacturing
K.3.1 General
K.3.2 Routine test
K.3.3 Sampling test <\/td>\n<\/tr>\n\n 161<\/td>\n Annex L (normative) Routine tests (production tests)
L.1 General
L.2 Protective earthing continuity test
L.3 Checking of no-load output voltage
L.4 Dielectric strength test <\/td>\n<\/tr>\n\n 162<\/td>\n L.5 Checking of protective devices mounting
L.6 Visual inspection
L.7 Repetition test after routine dielectric strength test <\/td>\n<\/tr>\n\n 163<\/td>\n Annex M (informative) Examples to be used as a guide for 19.1
M.1 General
M.2 Coil-former
M.2.1 Concentric type
Figure M.1 \u2013 Examples for concentric type constructions <\/td>\n<\/tr>\n\n 164<\/td>\n M.2.2 Side-by-side type
M.3 Windings
M.3.1 Without screen
Figure M.2 \u2013 Examples for side-by-side type constructions
Figure M.3 \u2013 Examples for winding constructions without screen <\/td>\n<\/tr>\n\n 165<\/td>\n M.3.2 With screen
Figure M.4 \u2013 Examples for wrapped winding constructions
Figure M.5 \u2013 Examples for winding constructions with screen <\/td>\n<\/tr>\n\n 166<\/td>\n Annex N (informative) Examples for checking points of dielectric strength test voltages <\/td>\n<\/tr>\n \n 167<\/td>\n Figure N.2 \u2013 Transformer of class II construction with metal enclosure
Figure N.3 \u2013 Transformer of class II construction with enclosure of insulating material <\/td>\n<\/tr>\n\n 168<\/td>\n Annex O (void) <\/td>\n<\/tr>\n \n 169<\/td>\n Annex P (informative) Examples for measurement points of creepage distances and clearances
Figure P.1 \u2013 Transformer of class I construction <\/td>\n<\/tr>\n\n 170<\/td>\n Figure P.2 \u2013 Transformer of class I construction with earthed metal screen
Figure P.3 \u2013 Transformer of class II construction with metal enclosure <\/td>\n<\/tr>\n\n 171<\/td>\n Figure P.4 \u2013 Transformer of class II construction with enclosure of insulating material <\/td>\n<\/tr>\n \n 172<\/td>\n Annex Q (informative) Explanation of IP numbers for degrees of protection
Q.1 General
Q.2 Degrees of protection against access to hazardous parts and against solid foreign objects <\/td>\n<\/tr>\n\n 173<\/td>\n Table Q.1 \u2013 Degrees of protection against access to hazardous parts indicated by the first characteristic numeral
Table Q.2 \u2013 Degrees of protection against solid foreign objects indicated by the first characteristic numeral <\/td>\n<\/tr>\n\n 174<\/td>\n Q.3 Degrees of protection against ingress of water
Table Q.3 \u2013 Degrees of protection indicated by the second characteristic numeral <\/td>\n<\/tr>\n\n 175<\/td>\n Annex R (normative) Explanations of the application of 6.1.2.2.1 of IEC 60664-1:2007
R.1 Impulse dielectric test
R.2 Example
Table R.1 \u2013 Impulse test voltage according to 6.1.2.2.1 of IEC 60664-1:2007 <\/td>\n<\/tr>\n\n 177<\/td>\n Annex S (void) <\/td>\n<\/tr>\n \n 178<\/td>\n Annex T (void) <\/td>\n<\/tr>\n \n 179<\/td>\n Annex U (void) <\/td>\n<\/tr>\n \n 180<\/td>\n Annex V (informative) Symbols to be used for thermal cut-outs
V.1 General
V.2 Non-self-resetting thermal cut-out (see 3.3.4)
V.3 Self-resetting thermal cut-out (see 3.3.3)
Figure V.1 \u2013 Restored by manual operation
Figure V.2 \u2013 Restored by disconnection of the supply
Figure V.3 \u2013 Thermal link (see 3.3.5)
Figure V.4 \u2013 Self-resetting thermal cut-out <\/td>\n<\/tr>\n\n 181<\/td>\n Annex W (normative) Coated printed circuit boards
W.1 Preamble
W.2 General
W.3 Cold
W.4 Rapid change of temperature
W.5 Additional tests <\/td>\n<\/tr>\n\n 182<\/td>\n Bibliography <\/td>\n<\/tr>\n \n 184<\/td>\n Index of defined terms <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" \n\n
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