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IEC TS 60947-7-5:2021

(Main)

Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductors

Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductors

IEC TS 60947-7-5:2021 specifies requirements for terminal blocks with screw-type or screwless-type clamping units primarily intended for industrial or similar use and to be fixed to a support to provide electrical and mechanical connection. This document can be used for terminal blocks for connection between aluminium conductors or aluminium to copper conductors. It applies to terminal blocks intended to connect round conductors, with or without special preparation, having a cross-section between 2,5 mm2 and 300 mm2 (AWG 12 to 600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V AC (up to 1 000 Hz) or 1 500 V DC.

Appareillage à basse tension - Partie 7-5: Matériels accessoires - Blocs de jonction pour conducteurs en aluminium

L'IEC TS 60947-7-5:2021 spécifie les exigences relatives aux blocs de jonction avec organes de serrage du type à vis ou du type sans vis essentiellement destinés à un usage industriel ou analogue, et à être fixés sur un support afin d'assurer la connexion électrique et mécanique. Le présent document peut être utilisé pour les blocs de jonction qui assurent le raccordement entre des conducteurs en aluminium ou entre des conducteurs en aluminium et en cuivre. Il s'applique aux blocs de jonction destinés à raccorder les conducteurs ronds, avec ou sans préparation particulière, dont la section est comprise entre 2,5 mm2 et 300 mm2 (AWG 12 à 600 kcmil) et destinés à être utilisés dans des circuits présentant une tension assignée maximale de 1 000 V en courant alternatif (jusqu'à 1 000 Hz) ou de 1 500 V en courant continu.

General Information

Status
Published
Publication Date
21-Nov-2021
ICS
29.130.20 - Low voltage switchgear and controlgear
Technical Committee
SC 121A - Low-voltage switchgear and controlgear
Drafting Committee
PT 60947-7-5 - TC 121/SC 121A/PT 60947-7-5
Current Stage
PPUB - Publication issued
Start Date
25-Nov-2021
Completion Date
22-Nov-2021
Ref Project

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IEC TS 60947-7-5:2021 - Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductorsIEC TS 60947-7-5:2021 - Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductors
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IEC TS 60947-7-5:2021 - Low-voltage switchgear and controlgear - Part 7-5: Ancillary equipment - Terminal blocks for aluminium conductors
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IEC TS 60947-7-5 ®
Edition 1.0 2021-11
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Low-voltage switchgear and controlgear –
Part 7-5: Ancillary equipment – Terminal blocks for aluminium conductors

Appareillage à basse tension –
Partie 7-5: Matériels accessoires – Blocs de jonction pour conducteurs en
aluminium
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IEC TS 60947-7-5 ®
Edition 1.0 2021-11
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Low-voltage switchgear and controlgear –

Part 7-5: Ancillary equipment – Terminal blocks for aluminium conductors

Appareillage à basse tension –

Partie 7-5: Matériels accessoires – Blocs de jonction pour conducteurs en

aluminium
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-1041-9

– 2 – IEC TS 60947-7-5:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 Classification . 9
5 Characteristics . 10
5.1 Summary of characteristics . 10
5.2 Type of terminal block . 10
5.3 Rated and limiting values . 10
5.3.1 Rated voltage . 10
5.3.2 Short-time withstand current . 10
5.3.3 Standard cross-sections . 10
5.3.4 Nominal cross-section . 11
5.3.5 Nominal connecting capacity . 11
5.3.6 Nominal current . 11
6 Product information . 12
6.1 Marking . 12
6.2 Additional information . 12
7 Normal service, mounting and transport conditions . 13
8 Constructional and performance requirements . 13
8.1 Constructional requirements . 13
8.1.1 Clamping units . 13
8.1.2 Mounting . 13
8.1.3 Clearances and creepage distances . 13
8.1.4 Terminal identification and marking . 14
8.1.5 Resistance to abnormal heat and fire . 14
8.1.6 Nominal cross-section and nominal connection capacity . 14
8.2 Performance requirements . 15
8.2.1 General . 15
8.2.2 Temperature-rise . 16
8.2.3 Dielectric properties . 16
8.2.4 Short-time withstand current . 17
8.2.5 Voltage drop . 17
8.2.6 Electrical performance after ageing (for screwless-type terminal blocks
only) . 17
8.2.7 Current-cycle ageing test . 17
8.3 Electromagnetic compatibility . 17
9 Tests . 17
9.1 Kinds of test . 17
9.2 General . 17
9.3 Verification of mechanical characteristics . 18
9.3.1 General . 18
9.3.2 Attachment of the terminal block on its support . 18
9.3.3 Mechanical properties of clamping units . 20
9.4 Verification of electrical characteristics . 21

9.4.1 General . 21
9.4.2 Verification of clearances and creepage distances . 21
9.4.3 Dielectric tests . 22
9.4.4 Verification of the voltage drop . 22
9.4.5 Temperature-rise test . 23
9.4.6 Short-time withstand current test . 24
9.4.7 Ageing test (for screwless-type terminal blocks only) . 24
9.4.8 Current-cycle ageing test . 24
9.5 Verification of thermal characteristics . 28
9.6 Verification of EMC characteristics . 30
9.6.1 Immunity . 30
9.6.2 Emission . 30
9.7 Items subject to agreement between manufacturer and user . 30
Bibliography . 31

Figure 1 – Arrangement for test according to 9.3.2 . 19
Figure 2 – Arrangement for test according to 9.4.5 and for the verification of voltage drop . 23
Figure 3 – Three-step test for AC/ DC . 25
Figure 4 – Arrangement for current-cycle ageing test according to 9.4.8 . 26
Figure 5 – Schematic of conductor preparation (cross-section greater than 25 mm ) . 27
Figure 6 – Current-cycle ageing test procedure . 28
Figure 7 – Arrangement for test according to 9.5 . 29
Figure 8 – Point of test flame contact . 30

Table 1 – Standard cross-section of conductors . 11
Table 2 – Range for the nominal current for metric wire sizes . 15
Table 3 – Range for the nominal current for AWG or kcmil wire sizes . 16
Table 4 – Attachment test parameters . 19

– 4 – IEC TS 60947-7-5:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
...

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