International Standards and Conformity Assessment for all electrical, electronic and related technologies

SC 121B

Low-voltage switchgear and controlgear assemblies

 

Detail

Committee
Working Groups
Project Leader

Current

Status

Frcst Pub

Date

Stability

Date

SC 121BMT 2Mr Thomas W. MennellBPUB2020-072025

History

Stage
Document
Downloads
Decision Date
Target Date
AMW
121B/11/RR PDF file 125 kB
2014-04-15 
1CD
121B/12/CD PDF file 408 kB
2014-04-182014-04
CDM
121B/18/CC Word file 73 kB
PDF file 265 kB
2014-08-012014-08
A2CD
121B/18A/CC Word file 100 kB
PDF file 227 kB
2015-03-062014-11
2CD
121B/28/CD PDF file 532 kB
2015-03-062015-03
ACDV
121B/33A/CC Word file 241 kB
PDF file 297 kB
2015-06-192015-07
CCDV
121B/41/CDV
PDF file 467 kB
PDF file 427 kB
2016-03-112015-12
AFDIS
121B/44/RVC Word file 108 kB
PDF file 285 kB
2016-06-172016-09
AFDIS
121B/44A/RVC PDF file 773 kB
Word file 124 kB
2016-06-172016-09
TFDIS
2017-06-232017-08
DECFDIS
2017-08-032017-08
RFDIS
2017-08-082017-08
ACD
2018-07-272018-07
3CD
121B/75/CD
PDF file 425 kB
2018-11-022018-12
PCC
2018-12-282018-12
A3CD
121B/81/CC PDF file 1154 kB
Word file 353 kB
2019-02-152019-02
4CD
121B/84/CD
PDF file 878 kB
2019-03-152019-02
PCC
2019-06-072019-06
ACDV
121B/91/CC PDF file 442 kB
Word file 164 kB
2019-08-302019-12
TCDV
2019-09-032019-10
CCDV
121B/92/CDV
PDF file 480 kB
PDF file 485 kB
2019-10-252019-10
PRVC
2020-01-172020-01
AFDIS
121B/100/RVC PDF file 386 kB
Word file 166 kB
2020-02-282020-03
DECFDIS
2020-03-192020-03
RFDIS
2020-03-262020-04
CFDIS
121B/104/FDIS
2020-04-242020-06
PRVD
2020-06-052020-06
APUB
121B/109/RVD PDF file 120 kB
2020-06-192020-06
BPUB
2020-06-192020-06
PPUB
 2020-07

Abstract

IEC 61439-2:2020(E) defines the specific requirements for the power switchgear and controlgear assembly (abbreviated ‘PSC-assembly’ throughout this document see 3.1.101) as follows:
  • assemblies for which the rated voltage does not exceed 1  000 V AC or 1  500 V DC;
  • assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1  000 Hz;
NOTE 1 Frequencies above 1 kHz are considered as high frequencies, see also IEC 60664-1:2007, 5.3.3.2.5 to take into account additional constraints to insulation coordination.
  • assemblies intended for indoor and outdoor applications;
  • stationary or movable assemblies with or without enclosures;
  • assemblies intended for use in connection with the generation, transmission, distribution and conversion of electrical energy, and for the control of equipment consuming electrical energy and for associated data processing;
  • assemblies designed for use under special service conditions, for example in ships and in rail vehicles, provided that the other relevant specific requirements are complied with;
NOTE 2 Supplementary requirements for assemblies in ships are covered by IEC 60092-302-2.
This third edition cancels and replaces the second edition published in 2011. It constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
  1. addition of Annexes DD, EE and FF for assemblies for use in photovoltaic installation;
  2. clarification of the requirements for forms of internal separation and the addition of the requirement, when the form of separation is higher than 1, all parts within the functional unit compartment that remain live when the functional unit is switched off shall be protected to at least IPXXB;
  3. alignment with the structure of IEC 61439-1:—[1];
  4. addition of temperature-rise verification for; (i) temperature-rise verification of assemblies with natural cooling and circuits rated above 1 600 A by a combination of comparison with a reference design and calculation, and; (ii) temperature-rise verification of assemblies with active cooling and rated currents up to 1 600 A.
  5. consideration of IP with active cooling.

[1] Under preparation. Stage at the time of publication: IEC/PRVD 61439-1:2020.

Project

IEC 61439-2 ED3

Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies

 

 

Associated Documents:

121B/10/INF

PDF file 171 kB
17D/475/DC

PDF file 107 kB