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BS EN IEC 60947-3:2021

BS EN IEC 60947-3:2021

$215.11

Low-voltage switchgear and controlgear – Switches, disconnectors, switch-disconnectors and fuse-combination units

Published By Publication Date Number of Pages
BSI 2021 102
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This part of IEC 60947 applies to switches, disconnectors, switch-disconnectors and fuse-combination units and their dedicated accessories to be used in distribution circuits and motor circuits of which the rated voltage does not exceed 1 000 V AC or 1 500 V DC.

NOTE 1 Accessories are interconnecting units, extended terminals, internal coils, auxiliary contacts, motor operator, etc. offered as options with the basic unit.

This document does not apply to equipment coming within the scope of IEC 60947-2, IEC 60947-4- 1 and IEC 60947-5-1.

Particular requirements for switches, disconnectors, switch-disconnectors and fuse-combination units for use in photovoltaic (PV) DC applications are given in Annex D.

Specific requirements for LV switchgear intended for the connections of aluminium conductors are given in Annex E.

Guidance on measurement of power loss is provided in Annex F.

This document does not include the additional requirements necessary for electrical apparatus for explosive gas atmospheres.

NOTE 2 Depending on its design, a switch (or disconnector) can be referred to as “a rotary switch (disconnector)”, “cam-operated switch (disconnector)”, “knife-switch (disconnector)”, etc.

NOTE 3 In this document, the word “switch” also applies to the apparatus referred to in French as “commutateurs”, intended to modify the connections between several circuits and inter alia to substitute a part of a circuit for another.

NOTE 4 In general, throughout this document, switches, disconnectors, switch-disconnectors and fuse-combination units will be referred to as “equipment”.

The object of this document is to state:

  1. the characteristics of the equipment;

  2. the conditions that apply to the equipment with reference to:

    1. operation and behaviour in normal service;

    2. operation and behaviour in case of specified abnormal conditions, e.g. short-circuit;

    3. dielectric properties;

  3. the tests for confirming that these conditions have been met and the methods that are adopted for these tests;

  4. the information relevant to the marking of the equipment or made available by the manufacturer, e.g. in the catalogue.

  5. Specific items requiring agreement between the user and the manufacturer are identified in Annex B.

Specific items requiring agreement between the user and the manufacturer are identified in Annex B.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA(normative)Normative references to international publicationswith their corresponding European publications
9 English
CONTENTS
14 FOREWORD
16 INTRODUCTION
17 1 Scope
18 2 Normative references
19 3 Terms, definitions and index of terms
3.1 General
3.2 Alphabetical index of terms
20 3.3 General terms
22 4 Classification
4.1 According to the utilization category
4.2 According to the method of operation
4.2.1 Manually operated equipment
4.2.2 Remotely operated equipment
23 4.3 According to suitability for isolation
4.4 According to the degree of protection provided
4.5 Summary of symbols for equipment types
5 Characteristics
5.1 Summary of characteristics
Tables
Table 1 – Summary of equipment definitions
24 5.2 Type of equipment
5.3 Rated and limiting values for the main circuit
5.3.1 General
5.3.2 Rated voltages
5.3.3 Currents
5.3.4 Rated frequency
25 5.3.5 Rated duty
5.3.6 Normal load and overload characteristics
5.3.7 Short-circuit characteristics
26 5.4 Utilization category
Table 2 – Utilization categories
27 5.5 Control circuits
5.6 Auxiliary circuits
5.7 Relays and releases
5.8 Co-ordination with short-circuit protective devices (SCPD)
6 Product information
6.1 Nature of information
6.2 Marking
28 Table 3 – Product information
29 6.3 Instructions for installation, operation and maintenance, decommissioning and dismantling
7 Normal service, mounting and transport conditions
8 Constructional and performance requirements
8.1 Constructional requirements
8.1.1 General
30 8.2 Performance requirements
8.2.1 Operating conditions
31 8.2.2 Temperature-rise
8.2.3 Dielectric properties
8.2.4 Ability to make and break under no-load, normal load and overload conditions
32 Table 4 – Verification of rated making and breaking capacities (see 9.3.4.4) – Conditions for making and breaking corresponding to the various utilization categories
33 Table 5 – Verification of operational performance –Number of operating cycles corresponding to the rated operational current
Table 6 – Test circuit parameters for Table 5
34 8.2.5 Ability to make, break or withstand short-circuit currents
8.2.6 Void
8.2.7 Additional performance requirements for equipment suitable for isolation
8.2.8 Critical load current performance: DC equipment
8.2.9 Overload requirements for equipment incorporating fuses
8.3 Electromagnetic compatibility (EMC)
8.3.1 General
8.3.2 Immunity
35 8.3.3 Emission
Table 7 – Immunity tests a
Table 8 – Emission limits
36 9 Tests
9.1 Kinds of test
9.1.1 General
9.1.2 Type tests
9.1.3 Routine tests
37 9.1.4 Sampling tests
9.1.5 Special tests
9.2 Compliance with constructional requirements
9.2.1 General
38 9.3 Performance
9.3.1 General
9.3.2 Test sequences
Table 9 – List of type tests applicable to a given equipment
39 9.3.3 General test conditions
Table 10 – Overall scheme of test sequences
42 9.3.4 Test sequence I: general performance characteristics
43 Table 11 – Test sequence I: general performance characteristics
46 9.3.5 Test sequence II: operational performance capability
Table 12 – Temperature-rise limits for terminals and accessible parts
47 Table 13 – Test sequence II: operational performance capability
48 9.3.6 Test sequence III: short-circuit performance capability
49 Table 14 – Test sequence III: short-circuit performance capability
52 9.3.7 Test sequence IV: conditional short-circuit current
53 Table 15 – Test sequence IV: conditional short-circuit current –circuit-breaker protected
54 Table 16 – Test sequence IV: conditional short-circuit current – fuse protected
55 9.3.8 Test sequence V: overload performance capability
56 9.3.9 Test sequence VI: critical load current performance of equipment with a DC rating
Table 17 – Test sequence V: overload performance capability
58 9.4 Electromagnetic compatibility tests
9.4.1 General
Table 18 – Number of operating cycles corresponding to the critical load current
Table 19 – Test circuit parameters for Table 18
Table 20 – Test sequence VI: critical load current performanceof equipment with a DC rating
59 9.4.2 Immunity
9.4.3 Emission
9.5 Special tests
9.5.1 Mechanical and electrical durability
9.5.2 Mechanical durability
9.5.3 Electrical durability
60 9.5.4 Damp heat, salt mist, vibration and shock
61 Annexes
Annex A (normative) Equipment for direct switching of a single motor
A.1 General
A.2 Rated
A.2.1 Intermittent periodic duty or intermittent duty
A.2.2 Temporary duty
A.3 Making and breaking capacities
A.4 Utilization category
62 Table A.1 – Utilization categories
63 Table A.2 – Rated making and breaking capacity conditionscorresponding to several utilization categories
64 A.5 Operational performance
Table A.3 – Relationship between current broken Ic and off-time for the verification of the rated making and breaking capacities
Table A.4 – Operational performance –Conditions for making and breaking corresponding to several utilization categories
65 A.6 Mechanical durability
A.7 Electrical durability
A.8 Verification of making and breaking capacities
A.9 Operational performance test
A.10 Special tests
A.10.1 General
66 A.10.2 Mechanical durability test
A.10.3 Electrical durability test
67 A.11 Critical load current performance for DC equipment
Table A.5 – Verification of the number of on-load operating cycles –Conditions for making and breaking corresponding to several utilization categories
68 Annex B (informative) Items subject to agreement between manufacturer and user
69 Annex C (normative) Single pole operated three-pole switches
C.1 General
Figure C.1 – Typical arrangements
70 C.2 Tests
C.3 Test set-up and sequence
C.3.1 Making and breaking capacities (9.3.4.3) and operational performance (9.3.5.2)
C.3.2 Fuse protected short-circuit test (9.3.7.3)
C.4 Condition of equipment after tests
C.5 Instructions for use
71 Annex D (normative) Switches, disconnectors, switch-disconnectors and fuse-combination units for use in photovoltaic (PV) DC applications
D.1 General
D.1.1 Background
D.1.2 Object
D.2 Normative references
D.3 Terms and definitions
72 D.4 Classification
D.4.1 According to the utilization category
D.5 Characteristics
Table D.1 – Utilization categories
73 D.6 Product information
D.7 Normal service, mounting and transport conditions
D.8 Constructional and performance requirements
Table D.2 – Service arrangements
Table D.3 – Environmental conditions
74 Table D.4 – Rated impulse withstand levels for PV switches, PV disconnectors, PV switch-disconnectors or PV fuse-combination units
75 Table D.5 – Verification of rated making and breaking capacities (see 9.3.4.4) – Conditions for making and breaking corresponding to the DC-PV category
76 Table D.6 – Number of operating cycles
Table D.7 – Test circuit parameters for Table D.6
77 D.9 Tests
78 Table D.8 – Overall scheme of test sequences
80 Table D.9 – Number of operating cycles corresponding to the critical load current
Table D.10 – Test circuit parameters for Table D.9
83 Annex E (normative) Additional requirements for LV switchgear intended for connection of aluminium conductors
E.1 Object
E.2 Normative references
E.3 Terms, definitions and index of terms
84 E.4 Classification
E.5 Characteristics
E.6 Product information
E.6.1 Nature of information
E.6.2 Marking
E.6.3 Instructions for installation, operation and maintenance, decommissioning and dismantling
85 E.7 Normal service, mounting and transport conditions
E.8 Constructional and performance requirements
E.9 Tests
E.9.1 General
Table E.1 – List of tests for terminal connections a with aluminium cables
86 E.9.2 Current cycling test
87 Figures
Figure E.1 – General test arrangement
Figure E.2 – Mounting of terminals for the current cycling test
88 Table E.2 – Conductor length for current cycling test as per conductor cross-section
Table E.3 – Equalizer dimensions
90 Table E.4 – Starting test current for the current cycling test
91 E.9.3 Mechanical properties of terminals
Table E.5 – Example of stability factor calculation
92 E.9.4 Test for insertability of unprepared round aluminium conductors having the maximum cross-section
Table E.6 – Test values for flexion and pull-out test for cables
93 Table E.7 – Test aluminium cable for test currents up to 800 A a, d
94 Table E.8 – Test aluminium bars for test currents above 150 A and up to 3 150 A a, f
95 Annex F (informative) Power loss
F.1 General
F.2 Test methods
F.2.1 General
F.2.2 General case for AC switches and/or disconnectors
F.2.3 General case for AC fused combination units and fuse disconnectors
96 F.2.4 Switches and/or disconnectors of rated current not exceeding 400 A
F.2.5 Fused combination units and fuse disconnectors of rated current not exceeding 400 A
97 F.3 Test procedure
Figure F.1 – Example of power loss measurement according to F.2.2
98 Figure F.2 – Example of power loss measurement according to F.2.3
Figure F.3 – Example of power loss measurement according to F.2.4
99 Figure F.4 – Example of power loss measurement according to F.2.5
100 Bibliography

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BS EN IEC 60947-3:2021
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