IEC 61439-1 Low-voltage switchgear and controlgear assemblies

IEC 61439-1 Low-voltage switchgear and controlgear assemblies –

Part 1: General rules

IEC 61439-1 Low-voltage switchgear and controlgear assemblies -Part 1 General rules

IEC 61439-1 Low-voltage switchgear and controlgear assemblies -Part 1 General rules

Applicable standards

  1. BS EN 61439-1
  2. IEC 61439-1
  3. IS 8623-1


These standards deploy the constructional requirements, technical requirements for low voltage switchgear and controlgear assemblies only when required by the relevant Assemblies standard as follows.

  • ASSEMBLIES for which the rated voltage does not exceed 1 000 V in case of a.c. or1 500 V
    in case of d.c.;
  • 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 equipment;
  • ASSEMBLIES designed for use under special service conditions, for example in ships, in rail vehicles, for equipment in explosive atmospheres, and for domestic applications (operated by unskilled persons), provided that the relevant specific requirements are complied with
  • ASSEMBLIES designed for electrical equipment of machines. Supplementary requirements for ASSEMBLIES forming part of a machine are covered by the IEC 60204series.
  • ASSEMBLIES whether they are designed, manufactured and verified on a one-off basis or fully standardised and manufactured in quantity.

This standard does not apply to:

  • Sspecify an ASSEMBLY or used for a purpose of determining conformity.
  • Individual devices and self-contained components, such as motor starters, fuse switches, electronic equipment, etc. which will comply with the relevant product standards.

Other parts of 61439 are mentioned below:

1IEC 61439-1General rules


2IEC 61439-2Power switchgear and controlgear ASSEMBLIES (PSC-ASSEMBLIES)
3IEC 61439-3Distribution boards (to supersede IEC 60439-3)
4IEC 61439-4ASSEMBLIES for construction sites (to supersede IEC 60439-4)


5IEC 61439-5ASSEMBLIES for power distribution (to supersede IEC 60439-5)


6IEC 61439-6Busbar trunking systems (to supersede IEC 60439-2).


List of Tests to be performed in the testing process:

ClauseName of the Test 
8.1.2Protection against corrosion
8.1.3Thermal stability
8.1.4Resistance to UV radiations
8.1.5Resistance to insulating material to hear and fire
8.1.6Mechanical Strength
8.1.7Lifting Provision
8.2.1Protection against mechanical Impact
8.2.2Protection against contact with live parts, ingress of solid foreign bodies and


8.2.3Degree of protection of removable parts
8.3Clearances and creepage distances
8.4Protection against electric shock by total insulation
9.2Temperature Rise test