BS EN IEC 61439-1:2021

1   Scope

  This part of [IEC 61439](/search?q=IEC%C2%A061439)
   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](/search?q=IEC%C2%A061439) 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 : 

   
      
         

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assemblies for which the rated voltage does not exceed 1 000 V AC or 1 500 V DC;

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assemblies designed for a nominal frequency of the incoming supply or supplies not exceeding 1 000 Hz;

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assemblies intended for indoor and outdoor applications; ...