EN 60947-1:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Low-voltage switchgear and controlgear -- Part 1: General rules (IEC 60947-1:2007)Nizkonapetostne stikalne naprave – 1. del: Splošna pravila (IEC 60947-1:2007)Appareillage a basse tension -- Partie 1: Regles générales (IEC 60947-1:2007)Niederspannungsschaltgeräte -- Teil 1: Allgemeine Festlegungen (IEC 60947-1:2007)Ta slovenski standard je istoveten z:EN 60947-1:2007SIST EN 60947-1:2007en,fr,de29.130.20Nizkonapetostne stikalne in krmilne napraveLow voltage switchgear and controlgearICS:SIST EN 60947-1:20041DGRPHãþDSLOVENSKI
STANDARDSIST EN 60947-1:200701-november-2007

EUROPEAN STANDARD EN 60947-1 NORME EUROPÉENNE
EUROPÄISCHE NORM July 2007
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
© 2007 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60947-1:2007 E
ICS 29.130.20 Supersedes EN 60947-1:2004
English version
Low-voltage switchgear and controlgear -
Part 1: General rules (IEC 60947-1:2007)
Appareillage à basse tension -
Partie 1: Règles générales (CEI 60947-1:2007)
Niederspannungsschaltgeräte -
Teil 1: Allgemeine Festlegungen (IEC 60947-1:2007)
This European Standard was approved by CENELEC on 2007-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
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 translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Foreword The text of document 17B/1550/FDIS, future edition 5 of IEC 60947-1, prepared by SC 17B, Low-voltage switchgear and controlgear, of IEC TC 17, Switchgear and controlgear, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60947-1 on 2007-07-01. This European Standard supersedes EN 60947-1:2004. The main changes with respect to EN 60947-1:2004 are as follows: – modification and restructuration of 7.1; – introduction of new figures concerning EMC tests; – introduction of new Annexes Q, R and S. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2008-04-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2010-07-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directives EMC (98/336/EEC) and EMC2 (2004/108/EC). See Annex ZZ. Annexes ZA and ZZ have been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 60947-1:2007 was approved by CENELEC as a European Standard without any modification. __________

- 3 - EN 60947-1:2007 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-151 2001 International Electrotechnical Vocabulary (IEV) -
Part 151: Electrical and magnetic devices - -
IEC 60050-441 + A1 1984 2000 International Electrotechnical Vocabulary (IEV) -
Chapter 441: Switchgear, controlgear and fuses - -
IEC 60050-604 + A1 1987 1998 International Electrotechnical Vocabulary (IEV) -
Chapter 604: Generation, transmission and distribution of electricity - Operation - -
IEC 60050-826 2004 International Electrotechnical Vocabulary -
Part 826: Electrical installations - -
IEC 60060
Series High-voltage test techniques EN 60060 Series
IEC 60068-1 + corr. October + A1 1988 1988 1992 Environmental testing -
Part 1: General and guidance
EN 60068-1
IEC 60068-2-1 A1 A2 1990 1993 1994 Environmental testing -
Part 2: Tests - Tests A: Cold EN 60068-2-11) A1 A2
1993 1993 1994
IEC 60068-2-2 A1 A2 1974 1993 1994 Environmental testing -
Part 2: Tests - Tests B: Dry heat EN 60068-2-22) A1 A2
1993 1993 1994
IEC 60068-2-6
1995 1995 Environmental testing -
Part 2: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 1995
IEC 60068-2-27 1987 Basic environmental testing procedures -
Part 2: Tests - Test Ea and guidance: Shock EN 60068-2-27 1993
IEC 60068-2-30 2005 Environmental testing -
Part 2-30: Tests - Test Db: Damp heat, cyclic (12 h + 12 h cycle) EN 60068-2-30 2005
IEC 60068-2-52
1996 Environmental testing -
Part 2: Tests - Test Kb: Salt mist, cyclic (sodium chloride solution) EN 60068-2-52 1996
1) EN 60068-2-1 is superseded by EN 60068-2-1:2007, which is based on IEC 60068-2-1:2007. 2) EN 60068-2-2 includes supplement A:1976 to IEC 60068-2-2.

Publication Year Title EN/HD Year IEC 60068-2-78 2001 Environmental testing -
Part 2-78: Tests - Test Cab: Damp heat, steady state EN 60068-2-78 2001
IEC 60071-1 1993 Insulation co-ordination -
Part 1: Definitions, principles and rules EN 60071-13)
IEC 60073 2002 Basic and safety principles for man-machine interface, marking and identification - Coding principles for indicators and actuators EN 60073 2002
IEC 60085 2004 Electrical insulation - Thermal classification EN 60085 2004
IEC 60112
2003 Method for the determination of the proof and the comparative tracking indices of solid insulating materials EN 60112 2003
IEC 60216 Series Electrical insulating materials - Properties of thermal endurance
EN 60216 Series
IEC 60228 2004 Conductors of insulated cables EN 60228 + corr. May
2005 2005
IEC 60269-1 A1 1998 2005 Low-voltage fuses -
Part 1: General requirements EN 60269-14) A1
1998 2005
IEC 60269-2 A1 A2 1986 1995 2001 Low-voltage fuses -
Part 2: Supplementary requirements for fuses for use by authorized persons (fuses mainly for industrial application) EN 60269-25) A1 A2
1995 1997 2002
IEC 60344 A1 1980 1985 Guide to the calculation of resistance of plain and coated copper conductors of low-frequency cables and wires - -
IEC 60364-4-44 2001 Electrical installations of buildings -
Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances - -
IEC 60364-4-44/A1 (mod) 2003 Electrical installations of buildings -
Part 4-44: Protection for safety - Protection against voltage disturbances and electromagnetic disturbances -
Clause 443: Protection against overvoltages of atmospheric origin or due to switching HD 60364-4-443 2006
IEC 60417 Data-base Graphical symbols for use on equipment - -
IEC 60439-1 A1 1999 2004 Low-voltage switchgear and controlgear assemblies -
Part 1: Type-tested and partially type-tested assemblies EN 60439-1 A1 1999 2004
3) EN 60071-1 is superseded by EN 60071-1:2006, which is based on IEC 60071-1:2006. 4) EN 60269-1 is superseded by EN 60269-1:2007, which is based on IEC 60269-1:2006. 5) EN 60269-2 is superseded by HD 60269-2:2007, which is based on IEC 60269-2:2006.

- 5 - EN 60947-1:2007 Publication Year Title EN/HD Year IEC 60445
1999 Basic and safety principles for man-machine interface, marking and identification - Identification of equipment terminals and of terminations of certain designated conductors, including general rules for an alphanumeric system EN 604456)
IEC 60447 2004 Basic and safety principles for man-machine interface, marking and identification - Actuating principles EN 60447 2004
IEC 60529
A1 1989
1999 Degrees of protection provided by enclosures (IP Code) EN 60529 + corr. May
A1 1991 1993 2000
IEC 60617 Data-base Graphical symbols for diagrams - -
IEC 60664-1 + A1 + A2 1992 2000 2002 Insulation coordination for equipment within low-voltage systems -
Part 1: Principles, requirements and tests
EN 60664-17)
IEC 60695-2-2 A1 1991 1994 Fire hazard testing -
Part 2: Test methods - Section 2: Needle-flame test EN 60695-2-28) A1
1994 1995
IEC 60695-2-10 2000 Fire hazard testing -
Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure EN 60695-2-10 2001
IEC 60695-2-11
2000 2001 Fire hazard testing -
Part 2-11: Glowing/hot-wire based test methods - Glow-wire flammability test method for end-products EN 60695-2-11 2001
IEC 60695-11-10 A1 1999 2003 Fire hazard testing -
Part 11-10: Test flames - 50 W horizontal and vertical flame test methods EN 60695-11-10 A1 1999 2003
IEC 60947-5-1 2003 Low-voltage switchgear and controlgear -
Part 5-1: Control circuit devices and switching elements - Electromechanical control circuit devices EN 60947-5-1 + corr. July
2004 2005
IEC 60947-8 A1 2003 2006 Low-voltage switchgear and controlgear -
Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines EN 60947-8 A1 2003 2006
IEC 60981 2004 Extra-heavy duty electrical rigid steel conduits - -
IEC 61000-3-2 2005 Electromagnetic compatibility (EMC) -
Part 3-2: Limits - Limits for harmonic current emissions (equipment input current ≤ 16 A per phase) EN 61000-3-2 2006
6) EN 60445 is superseded by EN 60445:2007, which is based on IEC 60445:2006. 7) EN 60664-1 is superseded by EN 60664-1:2007, which is based on IEC 60664-1:2007. 8) EN 60695-2-2 is superseded by EN 60695-11-5:2005, which is based on IEC 60695-11-5:2004.

Publication Year Title EN/HD Year IEC 61000-3-3
A1 A2 1994
2001 2005 Electromagnetic compatibility (EMC) -
Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection EN 61000-3-3 + corr. July
A1 A2 1995 1997 2001 2005
IEC 61000-4-2 A1 A2 1995 1998 2000 Electromagnetic compatibility (EMC) -
Part 4-2: Testing and measurement techniques - Electrostatic discharge immunity test EN 61000-4-2 A1 A2 1995 1998 2001
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) -
Part 4-3 : Testing and measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test EN 61000-4-3 2006
IEC 61000-4-4
2004 Electromagnetic compatibility (EMC) -
Part 4-4: Testing and measurement techniques - Electrical fast transient/burst immunity test EN 61000-4-4 2004
IEC 61000-4-5 2005 Electromagnetic compatibility (EMC) -
Part 4-5: Testing and measurement techniques - Surge immunity test EN 61000-4-5 2006
IEC 61000-4-6 +A1 +A2 2003 2004 2006 Electromagnetic compatibility (EMC) -
Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields
EN 61000-4-6
IEC 61000-4-8 A1 1993 2000 Electromagnetic compatibility (EMC) -
Part 4-8: Testing and measurement techniques - Power frequency magnetic field immunity test EN 61000-4-8 A1 1993 2001
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) -
Part 4-11: Testing and measurement techniques - Voltage dips, short interruptions and voltage variations immunity tests EN 61000-4-11 2004
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) -
Part 4-13: Testing and measurement techniques - Harmonics and interharmonics including mains signalling at a.c. power port, low frequency immunity tests EN 61000-4-13 2002
IEC 61000-6-2 2005 Electromagnetic compatibility (EMC) -
Part 6-2: Generic standards - Immunity for industrial environments EN 61000-6-2 + corr. September 2005 2005
IEC 61131-2
2003 Programmable controllers -
Part 2: Equipment requirements and tests EN 61131-2 + corr. August
2003 2003
IEC 61140 A1 (mod) 2001 2004 Protection against electric shock - Common aspects for installation and equipment EN 61140 A1 2002 2006
IEC 61180 Series High-voltage test techniques for low-voltage equipment
EN 61180 Series
- 7 - EN 60947-1:2007 Publication Year Title EN/HD Year CISPR 11 (mod) + A1 (mod) A2 2003 2004 2006 Industrial scientific and medical (ISM) radio-frequency equipment - Electromagnetic disturbance characteristics - Limits and methods of measurement
EN 55011 A2
2007 2007
Annex ZZ (informative)
Coverage of Essential Requirements of EC Directives
This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers all relevant essentiel requirements as given in Article 4 of the EC Directive 98/336/EEC and Article 1 of Annex I of the EC Directive 2004/108/EC.
Compliance with this standard provides one means of conformity with the specified essential requirements of the Directives concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard.

INTERNATIONAL STANDARD IECCEI NORME INTERNATIONALE60947-1Fifth editionCinquième édition2007-06 Low-voltage switchgear and controlgear – Part 1: General rules
Appareillage à basse tension – Partie 1: Règles générales XK Commission Electrotechnique InternationaleInternational Electrotechnical CommissionPRICE CODE CODE PRIX For price, see current cataloguePour prix, voir catalogue en vigueur

– 2 – 60947-1 © IEC:2007
CONTENTS FOREWORD.7
1 General.9 1.1 Scope and object.9 1.2 Normative references.10 2 Definitions.13 2.1 General terms.18 2.2 Switching devices.21 2.3 Parts of switching devices.24 2.4 Operation of switching devices.27 2.5 Characteristic quantities.32 2.6 Tests.41 2.7 Ports.41 3 Classification.42 4 Characteristics.43 4.1 General.44 4.2 Type of equipment.44 4.3 Rated and limiting values for the main circuit.44 4.4 Utilization category.50 4.5 Control circuits.50 4.6 Auxiliary circuits.51 4.7 Relays and releases.51 4.8 Co-ordination with short-circuit protective devices (SCPD).51 4.9 Switching overvoltages.52 5 Product information.52 5.1 Nature of information.52 5.2 Marking.53 5.3 Instructions for installation, operation and maintenance.54 6 Normal service, mounting and transport conditions.54 6.1 Normal service conditions.54 6.2 Conditions during transport and storage.56 6.3 Mounting.56 7 Constructional and performance requirements.56 7.1 Constructioynal requirements.56 7.2 Performance requirements.64 7.3 Electromagnetic compatibility (EMC).72 8 Tests.73 8.1 Kinds of test.73 8.2 Compliance with constructional requirements.75 8.3 Performance.81 8.4 Tests for EMC.101

60947-1 © IEC:2007 − 3 −
Annex A (informative)
Examples of utilization categories for low-voltage switchgear and controlgear.141 Annex B (informative)
Suitability of the equipment when conditions for operation in service
differ from the normal conditions.144 Annex C (normative)
Degrees of protection of enclosed equipment.146 Annex D (informative)
Examples of terminals.153 Annex E (informative)
Description of a method for adjusting the load circuit.160 Annex F (informative)
Determination of short-circuit power-factor or time-constant.162 Annex G (informative)
Measurement of creepage distances and clearances.164 Annex H (informative)
Correlation between the nominal voltage of the supply system and the rated impulse withstand voltage of equipment.170 Annex J (informative)
Items subject to agreement between manufacturer and user.172 Annex K Vacant.173 Annex L (normative)
Terminal marking and distinctive number.174 Annex M (normative)
Flammability test.185 Annex N (normative)
Requirements and tests for equipment with protective separation.188 Annex O (informative)
Environmental aspects.193 Annex P (informative)
Terminal lugs for low voltage switchgear and controlgear connected to copper conductors.201 Annex Q
(normative)
Special tests – Damp heat, salt mist, vibration and shock.202 Annex R
(informative)
Application of the metal foil for dielectric testing on accessible parts during operation or adjustment.207 Annex S
(normative)
Digital inputs and outputs.213
Bibliography.227
Table 1 – Standard cross-sections of round copper conductors and approximate relationship between mm2 and AWG/kcmil sizes (see 7.1.8.2).105 Table 2 – Temperature-rise limits of terminals (see 7.2.2.1 and 8.3.3.3.4).105 Table 3 – Temperature-rise limits of accessible parts (see 7.2.2.2 and 8.3.3.3.4).106 Table 4 – Tightening torques for the verification of the mechanical
strength of screw-type terminals (see 8.3.2.1, 8.2.6 and 8.2.6.2).107 Table 5 – Test values for flexion and pull-out tests for round copper conductors (see 8.2.4.4.1).108 Table 6 – Test values for pull-out test for flat copper conductors (see 8.2.4.4.2).108 Table 7 – Maximum conductor cross-sections and corresponding gauges
(see 8.2.4.5.1).109 Table 7a – Relationship between conductor cross-section and diameter.110 Table 8 – Tolerances on test quantities (see 8.3.4.3, item a)).111 Table 9 – Test copper conductors for test currents up to 400 A inclusive (see 8.3.3.3.4).111 Table 10 – Test copper conductors for test currents above 400 A and up to 800 A inclusive (see 8.3.3.3.4).112

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Table 11 – Test copper bars for test currents above 400 A and up to 3 150 A inclusive (see 8.3.3.3.4).112 Table 12 – Impulse withstand test voltages.113 Table 12A – Dielectric test voltage corresponding to the rated insulation voltage.113 Table 13 – Minimum clearances in air.114 Table 14 – Test voltages across the open contacts of equipment suitable for isolation.114 Table 15 – Minimum creepage distances.115 Table 16 – Values of power-factors and time-constants corresponding to test currents, and ratio n between peak and r.m.s. values of current (see 8.3.4.3, item a)).116 Table 17 – Actuator test force (see 8.2.5.2.1).116 Table 18 – Vacant.116 Table 19 – Vacant.116 Table 20 – Test values for conduit pull-out test (see 8.2.7.1).116 Table 21 – Test values for conduit bending test (see 8.2.7.2).117 Table 22 – Test values for conduit torque test (see 8.2.7.1 and 8.2.7.3).117 Table 23 – Tests for EMC – Immunity (see 8.4.1.2).118 Table 24 – Acceptance criteria when EM disturbances are present.119 Table H.1 – Correspondence between the nominal voltage of the supply system and the equipment rated impulse withstand voltage, in case of overvoltage protection by surge-arresters according to IEC 60099-1.171 Table M.1 – HWI and AI characteristics for materials necessary to retain
current carrying parts in position.187 Table M.2 – HWI and AI characteristics for materials other than those covered
by Table M.1.187 Table P.1 – Examples of terminal lugs for low voltage switchgear and controlgear
connected to copper conductors.201 Table Q.1 – Test sequences.204 Table S.1 – Rated values and operating ranges of incoming power supply.214 Table S.2 – Standard operating ranges for digital inputs (current sinking).217 Table S.3 – Rated values and operating ranges for current sourcing digital a.c. outputs.218 Table S.4 – Rated values and operating ranges (d.c.)
for current-sourcing digital d.c. outputs.220 Table S.5 – Overload and short-circuit tests for digital outputs.223
Figure 1 – Test equipment for flexion test (see 8.2.4.3 and Table 5).120 Figure 2 – Gauges of form A and form B (see 8.2.4.5.2 and Table 7).120 Figure 3 – Diagram of the test circuit for the verification of making and breaking capacities of a single-pole equipment on single-phase a.c. or on d.c. (see 8.3.3.5.2).121 Figure 4 – Diagram of the test circuit for the verification of making and breaking capacities of a two-pole equipment on single-phase a.c. or on d.c. (see 8.3.3.5.2).122 Figure 5 – Diagram of the test circuit for the verification of making and breaking capacities of a three-pole equipment (see 8.3.3.5.2).123

60947-1 © IEC:2007 − 5 −
Figure 6 – Diagram of the test circuit for the verification of making and breaking capacities of a four-pole equipment (see 8.3.3.5.2).124 Figure 7 – Schematic illustration of the recovery voltage across contacts of the first phase to clear under ideal conditions (see 8.3.3.5.2, item e)).125 Figure 8a – Diagram of a load circuit adjustment method: load star-point earthed.126 Figure 8b – Diagram of a load circuit adjustment method: supply star-point earthed.127 Figure 9 – Diagram of the test circuit for the verification of short-circuit making and breaking capacities of a single-pole equipment on single-phase a.c. or on d.c. (see 8.3.4.1.2).128 Figure 10 – Diagram of the test circuit for the verification of short-circuit making and breaking capacities of a two-pole equipment on single-phase a.c. or on d.c. (see 8.3.4.1.2).129 Figure 11 – Diagram of the test circuit for the verification of short-circuit making and breaking capacities of a three-pole equipment (see 8.3.4.1.2).130 Figure 12 – Diagram of the test circuit for the verification of short-circuit making and breaking capacities of a four-pole equipment (see 8.3.4.1.2).131 Figure 13 – Example of short-circuit making and breaking test record in the case of a single-pole equipment on single-phase a.c. (see 8.3.4.1.8).132 Figure 14 – Verification of short-circuit making and breaking capacities on d.c. (see 8.3.4.1.8).133 Figure 15 – Determination of the prospective breaking current when the first calibration of the test circuit has been made at a current lower than the rated breaking capacity (see 8.3.4.1.8, item b)).134 Figure 16 – Actuator test force (see 8.2.5.2.1 and Table 17).135 Figure 17 – Examples of ports.136 Figure 18 – Test set-up for the verification of immunity to electrostatic discharges.136 Figure 19 – Test set-up for the verification of immunity to radiated radio-frequency electromagnetic fields.137 Figure 20 – Test set-up for the verification of immunity to electrical fast transients/bursts 138 Figure 21 – Test set-up for the verification of immunity to conducted disturbances induced by r.f. fields on power lines.139 Figure 22 – Example of test set-up for the verification of immunity to conducted disturbances induced by r.f. fields on signal lines when CDN´s are not suitable.139 Figure 23 – Test set-up for the verification of immunity to power frequency magnetic fields.140 Figure C.1 – IP Codes.150 Figure D.1 − Screw terminals.153 Figure D.2 – Pillar terminals.154 Figure D.3 − Stud terminals.155 Figure D.4 – Saddle terminals.156 Figure D.5 – Lug terminals.157 Figure D.6 – Mantle terminals.158 Figure D.7 – Screwless-type terminals.159 Figure E.1 – Determination of the actual value of the factor γ.161

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Figure G.1 – Measurement of ribs.165 Figure G.2 – Creepage distance across the fixed and moving
insulation of contact carriers.165 Figure M.1 – Test fixture for hot wire ignition test.185 Figure M.2 – Circuit for arc ignition test.186 Figure N.1 – Example of application with component connected
between separated circuits.192 Figure O.1 − Conceptual relationship between provisions in product standards and the environmental impacts associated with the product during its life cycle.197 Figure P.1 – Dimensions.201 Figure R.1 – Operating mechanism outside the enclosure.209 Figure R.2 – Operating space for push-button actuation.210 Figure R.3 – Examples of finger protected location for hazardous-live-parts in push-button vicinity (approximately 25 mm).211 Figure R.4 – Operating space for actuation by rotary means.212 Figure S.1 – I/O parameters.215 Figure S.2 – U-I operation regions of current-sinking inputs.216 Figure S.3 – Temporary overload waveform for digital a.c. outputs.218 Figure S.4 – Temporary overload waveform for digital d.c. outputs.221

60947-1 © IEC:2007 − 7 −
INTERNATIONAL ELECTROTECHNICAL COMMISSION _____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 1: General rules
FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60947-1 has been prepared by subcommittee 17B: Low-voltage switchgear and controlgear, of IEC technical committee 17: Switchgear and controlgear. This fifth edition of IEC 60947-1 cancels and replaces the fourth edition published in 2004. This edition incorporates Amendment 1 which was not published separately due to the number of changes and pages. The main changes with respect to the previous edition are as follows: – modification and restructuration of 7.1; – introduction of new figures concerning EMC tests; – introduction of new Annexes Q, R and S.

– 8 – 60947-1 © IEC:2007
The text of this standard is based on the fourth edition and the following documents: FDIS Report on voting 17B/1550/FDIS 17B/1563/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A vertical line in the margin shows where the base publication has been modified by the Amendment 1. A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear and controlgear can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be
• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.

60947-1 © IEC:2007 − 9 −
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 1: General rules
1 General The purpose of this standard is to harmonize as far as practicable all rules and requirements of a general nature applicable to low-voltage switchgear and controlgear in order to obtain uniformity of requirements and tests throughout the corresponding range of equipment and to avoid the need for testing to different standards. All those parts of the various equipment standards which can be considered as general have therefore been gathered in this standard together with specific subjects of wide interest and application, e.g. temperature-rise, dielectric properties, etc. For each type of low-voltage switchgear and controlgear, only two main documents are necessary to determine all requirements and tests: 1) this basic standard, referred to as "Part 1" in the specific standards covering the various types of low-voltage switchgear and controlgear; 2) the relevant equipment standard hereinafter referred to as the "relevant product standard" or "product standard". For a general rule to apply to a specific product standard, it shall be explicitly referred to by the latter, by quoting the relevant clause or subclause number of this standard followed by "IEC 60947-1" e.g. "7.2.3 of IEC 60947-1". A specific product standard may not require, and hence may omit, a general rule (as being not applicable), or it may add to it (if deemed inadequate in the particular case), but it may not deviate from it, unless there is a substantial technical justification. NOTE The product standards due to be part of the series of IEC standards covering low-voltage switchgear and controlgear are: 60947-2: Part 2: Circuit-breakers 60947-3: Part 3: Switches, disconnectors, switch-disconnectors and fuse combination units 60947-4: Part 4: Contactors and motor-starters 60947-5: Part 5: Control-circuit devices and switching elements 60947-6: Part 6: Multiple function equipment 60947-7: Part 7: Ancillary equipment 1.1 Scope and object This standard applies, when required by the relevant product standard, to switchgear and controlgear hereinafter referred to as "equipment" and intended to be connected to circuits, the rated voltage of which does not exceed 1 000 V a.c. or 1 500 V d.c. It does not apply to low-voltage switchgear and controlgear assemblies which are dealt with in IEC 60439.

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NOTE In certain clauses or subclauses of this standard, the equipment covered by this standard is also referred to as "device", to be consistent with the text of such clauses or subclauses. The object of this standard is to state those general rules and requirements which are common to low-voltage equipment as defined in 1.1, including for example: – definitions; – characteristics; – information supplied with the equipment; – normal service, mounting and transport conditions; – constructional and performance requirements; – verification of characteristics and performance. Digital inputs and/or digital outputs contained in switchgear and controlgear, and intended to be compatible with programmable controllers (PLCs) are covered by Annex S. 1.2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050(151):2001, International Electrotechnical Vocabulary (IEV) – Chapter 151: Electrical and magnetic devices IEC 60050(441):1984, International Electrotechnical Vocabulary (IEV) – Chapter 441: Switchgear, controlgear and fuses
Amendment 1 (2000) IEC 60050(604):1987, International Electrotechnical Vocabulary (IEV) – Chapter 604: Generation, transmission and distribution of electricity – Operation
Amendment 1 (1998) IEC 60050(826):2004, International Electrotechnical Vocabulary (IEV) – Chapter 826: Electrical installations IEC 60060, High-voltage test techniques IEC 60068-1:1988, Environmental testing − Part 1: General and guidance
Amendment 1 (1992) IEC 60068-2-1:1990, Environmental testing − Part 2-1: Tests − Tests A: Cold
Amendment 1 (1993)
Amendment 2 (1994) IEC 60068-2-2:1974, Environmental testing − Part 2-2: Tests − Tests B: Dry heat
Amendment 1 (1993)
Amendment 2 (1994) IEC 60068-2-6:1995, Environmental testing − Part 2-6: Tests − Test Fc: Vibration (sinusoidal) IEC 60068-2-27:1987, Environmental testing − Part 2-27: Tests − Test Ea and guidance: Shock

60947-1 © IEC:2007 − 11 −
IEC 60068-2-30:2005, Environmental testing − Part 2-30: Tests − Test Db: Damp heat, cyclic (12 h + 12 h cycle) IEC 60068-2-52:1996, Environmental testing − Part 2-52: Tests − Test Kb: Salt mist, cyclic (sodium chloride solution) IEC 60068-2-78:2001, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state IEC 60071-1:1993, Insulation co-ordination – Part 1: Definitions, principles and rules IEC 60073:2002, Basic and safety principles for man-machine interface, marking and identification – Coding principles for indicators and actuators IEC 60085:2004, Electrical insulation – Thermal classification IEC 60112:2003, Method for the determination of the proof and the comparative tracking indices of solid insulating materials IEC 60216, Guide for the determination of thermal endurance properties of electrical insulating materials IEC 60228:2004, Conductors of insulated cables IEC 60269-1:1998, Low-voltage fuses –
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