NOTE 1 Throughout this standard, the term ASSEMBLY (see 3.1.1) is used for a low-voltage switchgear and
This part of the IEC 61439 series lays down the general definitions and service conditions,
construction requirements, technical characteristics and verification requirements for low303
voltage switchgear and controlgear assemblies.
This standard cannot be used alone to specify an ASSEMBLY or used for a purpose of
determining conformity. ASSEMBLIES shall comply with the relevant part of the IEC 61439
series; Parts 2 onwards.
This standard applies to low-voltage switchgear and controlgear assemblies (ASSEMBLIES) only
when required by the relevant ASSEMBLY standard as follows:
– ASSEMBLIES for which the rated voltage does not exceed 1 000 V in case of a.c. or
1 500 V in case of d.c.;
– ASSEMBLIES designed for a nominal frequency of the incoming supply(s) does not exceed
– ASSEMBLIES intended for indoor and outdoor applications;
– stationary or movable ASSEMBLIES with or without enclosure;
– ASSEMBLIES intended for use in connection with the generation, transmission, distribution
and conversion of electric energy, and for the control of electric energy consuming
This standard applies to all ASSEMBLIES whether they are designed, manufactured and verified
on a one-off basis or fully standardised and manufactured in quantity.
The manufacture and/or assembly may be carried out other than by the original manufacturer
(see 3.10.1).This standard does not apply to individual devices and self-contained components, such as
motor starters, fuse switches, power electronic converter systems and equipment (PECS),
switch mode power supplies (SMPS), uninterruptable power supplies (UPS), adjustable speed
power drives systems (BDM/CDM/PDS), other electronic equipment, etc. which will comply
with the relevant product standards.
The relevant part of the IEC 61439 series applies to the integration of mechanical and
electrical components (switching devices, PECS, SMPS, UPS, BDM/CDM/PDS, control
devices, busbars, functional units, structural parts, etc.), into an ASSEMBLY. For some
applications involving, for example, ATEX or functional safety, there may be a need to comply
with the requirements of other standard or legislation in addition to those specified in the IEC