BS EN IEC 61439-1:2021

1   Scope

This part of IEC 61439 lays down the general definitions and service conditions, construction requirements, technical characteristics and verification requirements for low-voltage switchgear and controlgear assemblies .

NOTE Throughout this document, the term assembly (s) (see 3.1.1) is used for a low-voltage switchgear and controlgear assembly (s).

For the purpose of determining assembly conformity, the requirements of the relevant part of the IEC 61439 series, Part 2 onwards, apply together with the cited requirements of this document. For assemblies not covered by Part 3 onward, Part 2 applies. This document applies to assemblies only when required by the relevant assembly standard 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;

– assemblies intended for indoor and outdoor applications; ...