IEC 61439

IEC 61439

A low-voltage switchgear and controlgear assembly (ASSEMBLY) is a combination of low-voltage switching devices together with associated equipment (for controlling, measuring, signalling, etc.) complete with all the internal mechanical and electrical interconnections and structural parts. As with every component of an electrical installation, the ASSEMBLY also has to comply with its appropriate standard.

In January 2009 the IEC- 61439, the new standard for low- voltage switchgear and control gear Assemblies, was published. This was the aim of an international project group that had been working on a task named “radical restructuring and revision of IEC 60439 series” since 1998. This initiative was introduced by several countries following dissatisfaction with the IEC 60439 series. The purpose was to harmonise and define all general requirements for low-voltage electrical Assemblies.

The IEC 60439 standard applies to enclosures for which the rated voltage is under or equal to 1000 V AC (at frequencies not exceeding 1000 Hz) or 1500 V DC. The standard makes a distinction between type-tested assemblies (TTA) and partially type-tested assemblies (PTTA).

The new IEC 61439 standard applies to enclosures for which the rated voltage is under 1000 V AC (at frequencies not exceeding 1000 Hz) or 1500 V DC. The standard defines the design verified ASSEMBLIES and eliminates completely the categories TTA and PTTA. In order to conform to the standard, type tests have been replaced by a design verification which can be carried out by the three equivalent and alternative methods of 1) testing, 2) comparison/ calculation/measurement or 3) application of design rules/ assessment.

MODUTEC LV modular switchboard enclosure systems have been repeatedly Type Tested as per IEC 61439 Part 1 & 2.

Part 1 is the general rules part and cannot be used alone to specify an ASSEMBLY.

Part 2 defines the specific requirements of power switchgear and control gear ASSEMBLIES (PSC ASSEMBLIES) and must be used with Part 1. This is the only part that has a double role, it covers PSC ASSEMBLIES and any ASSEMBLY which is not covered by any other specific parts.

DESIGN VERIFICATION METHODS

Verification made on a sample of an ASSEMBLY or on parts of ASSEMBLIES to show that design meets the requirements of the relevant ASSEMBLY standard.

Verification by test :

Test made on a sample of an ASSEMBLY or on parts of ASSEMBLIES to verify that the design meets the requirements of the relevant assembly standards.

Verification by comparison :

Structured comparison of a proposed design of an assembly or parts of an assembly with a reference design verified by test.

Verification by assessment :

Design verification of strict design rules or calculations applied to a sample of an ASSEMBLY or on parts of ASSEMBLIES to verify that the design meets the requirements of the relevant assembly standards.

LIST OF TESTS FOR COMPLETE DESIGN VERIFICATION

Construction Requirement:

  • Strength of material and parts
  • Degree of protection of enclosures
  • Clearances
  • Creepage distances
  • Protection against electric shock and integrity of protective circuits
  • Incorporation of switching devices and components
  • Internal electrical circuits and connections
  • Terminals for external conductors
  • Performance Requirement:

  • Di-electric properties
  • Verification of temperature rise
  • Short circuit withstand strength
  • Terminals for external conductors
  • Electromagnetic compatibility
  • Mechanical operations

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