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IEC 60947-8:2021

(Main)

Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines

Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines

IEC 60947-8:2021 specifies requirements for control units, which control a switching device in response to the PTC thermistors incorporated in rotating electrical machines and the industrial application.
This second edition cancels and replaces the first edition published in 2003, Amendment 1:2006 and Amendment 2:2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
safety aspects related to:
general aspects;
limited energy circuits;
electronic circuits;
alignment to IEC 60947-1:2020;
wire break detection function;
the term detector is replaced by thermistor;
reference to IEC 60738-1-4.

Appareillage à basse tension - Partie 8: Unités de commande pour la protection thermique incorporée (CTP) aux machines électriques tournantes

L'IEC 60947-8:2021 spécifie les exigences pour les unités de commande qui commandent un appareil de connexion réagissant aux thermistances CTP incorporées dans les machines électriques tournantes et l’application industrielle.
Cette deuxième édition annule et remplace la première édition parue en 2003, son Amendement 1:2006 et son Amendement 2:2011. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
des aspects liés à la sécurité concernant:
les aspects généraux;
les circuits à énergie limitée;
les circuits électroniques;
l’alignement avec l’IEC 60947-1:2020;
la fonction de détection de rupture de conducteur;
le terme détecteur est remplacé par thermistance;
la référence à l’IEC 60738-1-4.

General Information

Status
Published
Publication Date
27-Jul-2021
ICS
29.130.20 - Low voltage switchgear and controlgear
Technical Committee
SC 121A - Low-voltage switchgear and controlgear
Current Stage
PPUB - Publication issued
Start Date
03-Sep-2021
Completion Date
28-Jul-2021
Ref Project

Relations

Revises
IEC 60947-8:2003/AMD1:2006 - Amendment 1 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines
Effective Date
05-Sep-2023
Revises
IEC 60947-8:2003/AMD2:2011 - Amendment 2 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines
Effective Date
05-Sep-2023
Revises
IEC 60947-8:2003 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines
Effective Date
05-Sep-2023

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IEC 60947-8:2021 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machinesIEC 60947-8:2021 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines
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IEC 60947-8:2021 - Low-voltage switchgear and controlgear - Part 8: Control units for built-in thermal protection (PTC) for rotating electrical machines
English and French language
82 pages
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IEC 60947-8 ®
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 8: Control units for built-in thermal protection (PTC) for rotating electrical
machines
Appareillage à basse tension –
Partie 8: Unités de commande pour la protection thermique incorporée (CTP)
aux machines électriques tournantes

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IEC 60947-8 ®
Edition 2.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –

Part 8: Control units for built-in thermal protection (PTC) for rotating electrical

machines
Appareillage à basse tension –

Partie 8: Unités de commande pour la protection thermique incorporée (CTP)

aux machines électriques tournantes

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-1009-4

– 2 – IEC 60947-8:2021 © IEC 2021
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions, symbols and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Symbols and abbreviated terms . 11
4 Void . 11
5 Characteristics of control units for built-in thermal protection (PTC) . 11
5.1 Summary of characteristics . 11
5.2 Type of equipment . 11
5.2.1 Operating temperatures of protection systems . 11
5.2.2 Rated PTC thermistor operating temperature . 11
5.2.3 Rated system operating temperature . 12
5.2.4 Maximum permissible rated operating temperature for the system . 12
5.2.5 Control unit with reset temperature . 12
5.2.6 Control unit with sensor short-circuit detection . 12
5.2.7 Control unit with sensor wire break detection . 12
5.3 Rated electrical values of the switching device of the control unit . 13
5.3.1 Rated electrical values of switching devices . 13
5.3.2 Rated voltages of a control unit . 13
5.3.3 Rated currents of a control unit . 13
5.3.4 Rated making and breaking capacities of a control unit . 13
5.4 Rated electrical values of characteristic variation related to PTC thermistors . 13
5.4.1 General . 13
5.4.2 Electrical data/ratings and characteristics related to the PTC thermistor . 13
5.4.3 Rated voltage of the PTC thermistor circuit of the control unit . 14
5.5 Control supply circuit . 14
5.6 Auxiliary circuits . 14
6 Product information . 14
6.1 Nature of information . 14
6.2 Marking . 15
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling. 15
6.4 Environmental information . 15
7 Normal service, mounting and transport conditions . 15
8 Constructional and performance requirements . 16
8.1 Constructional requirements . 16
8.1.1 General . 16
8.1.2 Materials . 17
8.1.3 Current-carrying parts and their connections . 17
8.1.4 Clearances and creepage distances . 17
8.1.5 Vacant . 17
8.1.6 Vacant . 17
8.1.7 Vacant . 17
8.1.8 Terminals . 17

8.1.9 Vacant . 18
8.1.10 Provisions for protective earthing . 18
8.1.11 Dedicated enclosures for equipment . 18
8.1.12 Degrees of protection of enclosed equipment . 18
8.1.13 Conduit pull-out, torque and bending with metallic conduits . 18
8.1.14 Limited energy source . 18
8.1.15 Stored charge energy circuit . 20
8.1.16 Fault and abnormal conditions . 20
8.1.17 Short-circuit and overload protection of ports . 21
8.2 Performance requirements . 21
8.2.1 Operating conditions . 21
8.2.2 Abnormal conditions of service . 22
8.2.3 Dielectric properties . 22
8.2.4 Temperature rise . 22
8.2.5 Conditional short-circuit current . 22
8.2.6 Making and breaking capacities for control and auxiliary circuits . 22
8.2.7 Additional requirements and tests for equipment with protective

separation . 22
8.2.8 Operating temperature variation . 22
8.2.9 Damp heat . 22
8.2.10 Shock and vibration . 22
8.2.11 Requirements for short-circuit detection within the PTC thermistor
circuit . 23
8.2.12 Requirements for wire break detection within the PTC thermistor circuit . 23
8.3 Electromagnetic compatibility (EMC) . 23
8.3.1 General . 23
8.3.2 Immunity . 23
8.3.3 Emission . 24
9 Tests . 24
9.1 Kinds of tests .
...

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