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IEC 61439-3 Ed. 2.0 b:2024

Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO)
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IEC 61439-3 Ed. 2.0 b:2024

Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

PUBLISH DATE 2024
PAGES 88
IEC 61439-3 Ed. 2.0 b:2024

Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boards intended to be operated by ordinary persons (DBO)

IEC 61439-3:2024 defines the specific requirements for distribution boards intended to be operated by ordinary persons (abbreviated DBO throughout this document, see 3.1.101) as follows:

  • assemblies intended to be operated by ordinary persons (e.g. switching operations and replacing fuse-links), e.g. in domestic (household) applications;
  • assemblies containing outgoing circuits with protective devices intended to be operated by ordinary persons, complying e.g. with IEC 60898-1, the IEC 61008 series, the IEC 61009 series, IEC 62606, IEC 62423 and IEC 60269-3;
  • assemblies for applications where the nominal voltage to earth does not exceed 300 V AC (see Table G.1 of IEC 61439-1:2020);
  • NOTE The voltage limits for DC applications are under consideration.
  • assemblies with a rated current (Inc) of the outgoing circuits not exceeding 125 A and a rated current (InA) not exceeding 250 A;
  • 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;
  • enclosed, stationary assemblies;
  • assemblies for indoor or outdoor use.

This second edition cancels and replaces the first edition published in 2012. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

  • a) alignment with the structure of IEC 61439-1:2020;
  • b) inclusion in the scope of more examples of the type of protection and control devices;
  • c) deletion of type A and Type B DBOs;
  • d) addition of a new Annex BB related to DBOs used in a prosumer’s electrical installation (PEI);
  • e) addition of a new Annex CC related to rated current of a DBO with additional source of supply in parallel/simultaneously with another source that is connected to the DBO e.g. PV.
SDO IEC: International Electrotechnical Commission
Document Number IEC 61439
Publication Date March 1, 2024
Language b - English & French
Page Count 88
Revision Level 2.0
Supercedes
Committee 121B
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