oSIST prEN IEC 60947-6-1:2025

Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment

Niederspannungsschaltgeräte - Teil 6-1: Mehrfunktionsschaltgeräte - Netzumschalter

Appareillage à basse tension - Partie 6-1: Matériels à fonctions multiples - Equipement de transfert de source

Nizkonapetostne stikalne in krmilne naprave - 6-1. del: Večfunkcijska oprema - Preklopna stikalna oprema

General Information

• Status: Not Published
• Public Enquiry End Date: 30-Apr-2025
• ICS: 29.120.40 - Switches
• ICS: 29.130.20 - Low voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 11-Feb-2025
• Due Date: 01-Jul-2025
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: prEN IEC 60947-6-1:2025 - Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment

Relations

• Revises: SIST EN IEC 60947-6-1:2023 - Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment - Transfer switching equipment (IEC 60947-6-1:2021)
• Effective Date: 20-Feb-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2025
Nizkonapetostne stikalne in krmilne naprave - 6-1. del: Večfunkcijska oprema -
Preklopna stikalna oprema
Low-voltage switchgear and controlgear - Part 6-1: Multiple function equipment -
Transfer switching equipment
Niederspannungsschaltgeräte - Teil 6-1: Mehrfunktionsschaltgeräte - Netzumschalter
Appareillage à basse tension - Partie 6-1: Matériels à fonctions multiples - Equipement
de transfert de source
Ta slovenski standard je istoveten z: prEN IEC 60947-6-1:2025
ICS:
29.120.40 Stikala Switches
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

121A/639/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60947-6-1 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-07 2025-05-02
SUPERSEDES DOCUMENTS:
121A/594/CD, 121A/606B/CC
IEC SC 121A : LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR
SECRETARIAT: SECRETARY:
France Mr Michaël LAHEURTE
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
SC 23K,SC 121B
ASPECTS CONCERNED:
Electromagnetic Compatibility,Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses.
(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Low-voltage switchgear and controlgear – Part 6-1: Multiple function equipment - Transfer switching
equipment
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
SC121A officers are supporting the circulation of CDV for IEC 60947-6-1 ED4. Experts are kindly asked to refer to line
numbers when commenting the document.

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

121A/639/CDV – 2 – IEC CDV 60947-6-1  IEC 2024
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 12
3.1 General . 12
3.2 Alphabetical index of terms . 13
3.3 Transfer switching devices . 15
3.4 Operation of TSE . 17
3.5 Main contact positions . 19
3.6 Symbols and abbreviations . 20
4 Classification . 20
5 Characteristics . 21
5.1 Summary of characteristics . 21
5.2 Type and characteristics of equipment . 21
5.3 Rated and limiting values for the main circuit . 22
5.3.1 General . 22
5.3.2 Rated voltages . 22
5.3.3 Rated operational current (I ) . 22
e
5.3.4 Rated frequency . 22
5.3.5 Rated making and breaking capacities . 22
5.3.6 Short-circuit characteristics . 23
5.4 Utilization category . 23
5.5 Control circuits . 24
5.5.1 General . 24
5.5.2 Electro-mechanical devices operating the main circuit . 24
5.5.3 ATS controller . 24
5.6 Auxiliary circuits . 24
6 Product information . 24
6.1 Nature of information . 24
6.2 Marking . 25
6.3 Instructions for installation, operation and maintenance, decommissioning
and dismantling . 27
6.4 Environmental information . 28
7 Normal service, mounting and transport conditions . 28
8 Constructional and performance requirements . 29
8.1 Constructional requirements . 29
8.1.1 General . 29
8.1.2 Materials . 29
8.1.3 Indication . 30
8.1.4 Equipment suitable for isolation . 30
8.1.5 Opening and closing of main contacts . 30
8.1.6 Clearances and creepage distances . 30
8.1.7 Provision for protective earthing . 31

IEC CDV 60947-6-1  IEC 2024 – 3 – 121A/639/CDV
8.1.8 Stored charge energy circuit . 31
8.1.9 Stored energy closing . 31
8.1.10 Dedicated enclosures for TSE . 31
8.1.11 Communication . 31
8.2 Performance requirements . 32
8.2.1 Operating conditions . 32
8.2.2 Temperature-rise . 33
8.2.3 Dielectric properties . 33
8.2.4 Ability to make, carry, and break under no-load, normal load and
overload conditions . 33
8.2.5 Ability to make and break under short-circuit conditions . 36
8.2.6 Critical load current performance of TSE with DC rating . 37
8.3 Electromagnetic compatibility (EMC) . 37
8.3.1 General . 37
8.3.2 Immunity . 37
8.3.3 Emission . 38
9 Tests . 38
9.1 Kinds of tests . 38
9.2 Type tests . 38
9.2.1 General test conditions . 38
9.2.2 Test sequences . 39
9.2.3 Test sequence I - General performance characteristics. 43
9.2.4 Test sequence II – Operational performance capability . 49
9.2.5 Test sequence III – Short-circuit performance capability . 55
9.2.6 Test sequence IV - Conditional short-circuit current . 58
9.2.7 Test sequence V: critical load current performance of equipment with a
DC rating . 59
9.2.8 Test sequence VI - EMC tests . 62
9.3 Routine tests . 63
9.4 Environmental tests . 66
Annex A (normative) Assignment of utilization categories based on results of tests . 68
Annex B (informative) Items subject to agreement between manufacturer and user . 69
Annex C (normative) Bypass/Isolation Transfer Switch Equipment . 70
C.1 General . 70
C.2 (void) . 70
C.3 (void) . 70
C.4 Classification . 70
C.5 Characteristics . 70
C.6 Product information . 70
C.7 Normal service, mounting and transport conditions . 70
C.8 Constructional and performance requirements . 70
C.8.1 General . 70
C.8.2 Construction requirements . 71
C.8.3 Performance requirements . 72
C.9 Tests . 73
C.9.1 Interlocking function verification. 74
C.9.2 Full assembly tests . 74

121A/639/CDV – 4 – IEC CDV 60947-6-1  IEC 2024
C.9.3 Routine tests . 74
C.10 BTSE typical circuits and main components . 74
C.10.1 Example of operating sequence of a single line fixed type BTSE . 75
C.10.2 Example of operating sequence of a double line fixed type BTSE . 76
C.10.3 Example of operating sequence of a double line withdrawable type

BTSE . 77
C.10.4 Example of operating sequence of a double line load-break
withdrawable type BTSE .
...