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IEC 61914
Edition 3.0 2021-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Cable cleats for electrical installations
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IEC 61914
Edition 3.0 2021-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Cable cleats for electrical installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.120.20 ISBN 978-2-8322-4984-0
– 2 – IEC 61914:2021 CMV © IEC 2021
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviations . 8
4 General requirements . 10
5 General notes on tests . 10
6 Classification . 11
6.1 Classification according to material . 11
6.1.1 Metallic . 11
6.1.2 Non-metallic . 11
6.1.3 Composite . 11
6.2 Classification according to maximum and minimum temperature . 11
6.3 Classification according to resistance to impact . 12
6.3.1 Very light . 12
6.3.2 Light . 12
6.3.3 Medium . 12
6.3.4 Heavy . 12
6.3.5 Very heavy . 12
6.4 Classification according to type of retention or resistance to
electromechanical forces or both . 12
6.4.1 General . 13
6.4.2 With lateral retention . 13
6.4.3 With axial retention . 13
6.4.4 Resistant to electromechanical forces, withstanding one short circuit . 13
6.4.5 Resistant to electromechanical forces, withstanding more than one
short circuit . 13
6.5 Classification according to environmental influences . 13
6.5.1 Resistant Resistance to ultraviolet light for non-metallic and composite
components . 13
6.5.2 Resistant Resistance to corrosion for metallic and composite . 13
6.6 Classification according to electromagnetic compatibility . 15
6.6.1 Liable to inductive heating . 15
6.6.2 Not liable to inductive heating . 15
7 Marking and documentation . 13
7.1 Marking . 15
7.2 Durability and legibility . 15
7.3 Documentation . 15
8 Construction . 17
9 Mechanical properties. 17
9.1 Requirements . 17
9.2 Impact test . 18
9.3 Lateral load test . 20
9.3.1 Lateral load test for cable cleats . 20
9.3.2 Lateral load test for intermediate restraints . 23
9.4 Axial load tests . 24
9.5 Test for resistance to electromechanical forces . 26
9.5.1 General . 26
9.5.2 For cable cleats and intermediate restraints classified in 6.4.4 . 30
9.5.3 For cable cleats and intermediate restraints classified in 6.4.5 . 30
10 Fire hazards . 30
10.1 Flame propagation . 31
10.2 Smoke emission . 32
10.3 Smoke toxicity . 32
11 Environmental influences . 33
11.1 Resistance to ultraviolet light . 33
11.2 Resistance to corrosion . 33
11.2.1 General . 33
11.2.2 Non-metallic components. 34
11.2.3 Components made of stainless steel . 34
11.2.4 Components made of mild steel or cast iron with metallic coating . 34
11.2.5 Components made of non-ferrous alloys . 35
11.2.6 Salt spray test . 33
12 Electromagnetic compatibility . 36
12.1 Electromagnetic emission . 36
12.2 Inductive heating . 36
Annex A (informative) Examples of cable cleats and intermediate restraints . 37
Annex B (informative) Calculation of forces caused by short-circuit currents . 40
B.1 Characteristics . 40
B.2 Specification of the test current . 43
B.3 Calculation of the mechanical forces between conductors . 43
Annex C (normative) Identification of MV or HV cable used in short-circuit test . 46
Bibliography . 47
List of comments . 48
Figure 1 – Test piston dimensions. 16
Figure 2 – Typical arrangement for impact test . 18
Figure 3 – Typical arrangements for lateral load test for cable cleats . 22
Figure 4 – Typical arrangements for lateral load test for intermediate restraints . 23
Figure 5 – Typical arrangement for axial load test . 25
Figure 6 – Typical assemblies for test for resistance to electromechanical force . 27
Figure 7 – Typical arrangement of three cables in trefoil formation . 29
Figure 8 – Typical arrangement of cables in flat formation . 29
Figure 9 – Typical arrangement of the needle-flame test . 32
Figure A.1 – Metallic strap cable cleat for single or bundled cables . 38
Figure A.2 – Metallic single bolt cable cleat for single cable . 38
Figure A.3 – Metallic two-bolt cable cleat for single cable . 38
Figure A.4 – Composite cable cleat for three cables in trefoil formation . 38
Figure A.5 – Non-metallic cable cleat for single cable . 38
Figure A.6 – Metallic cable cleat for single cable with integral mounting stud . 38
Figure A.7 – Non-metallic cable cleat for three cables in flat formation . 38
Figure A.8 – Metallic cable cleat for use with channel cable support system . 38
– 4 – IEC 61914:2021 CMV © IEC 2021
Figure A.9 – Non-metallic cable cleat for three cables in trefoil formation . 38
Figure A.10 – Non-metallic cable cleat for three cables in trefoil formation with integral
ladder rung clamp . 39
Figure A.11 – Metallic intermediate restraint for three cables in flat formation . 39
Figure A.12 – Composite intermediate restraint for bundled cables . 39
Figure B.1 – Short-circuit current of a far-from-generator short circuit with constant a.c.
component . 41
Figure B.2 – Short-circuit current of a near-to-generator short circuit with decaying a.c.
component . 42
Figure B.3 – Two parallel conductors . 44
...