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Feature Industry standards

The original manufacturer is the organisation that originally developed the switchgear system and who is responsible for carrying out the design verification tests (Rittal). The assembly manufacturer is the organisation which builds the switchgear and controlgear assembly for a customer application (typically a panel builder or engineering com- pany) and is responsible for carrying out routine verification tests. These routine verification tests confirm the assembly has been manufactured in-line with the original manufac- turer’s recommendations and design rules.

Clarifying the standards

The diagram, right, shows the key differences between the IEC 60439 and IEC 61439 standards. The responsibility of the original manufacturer and assembly manufacturer are clearly shown.

Many of the verifications required for IEC 61439 refer to a

combination of different products and components in a switchgear and controlgear assembly. For example, evidence of protective circuit function requires testing of a defined protective circuit arrangement

in a defined enclosure

construction. A low voltage switchgear and controlgear assembly has to be a system consisting of: enclosures, cooling systems, busbar systems and devices. The standard defines the split between the original manufacturer and assembly manufacturer and has clearly defined the responsibility of each organisation in regard to testing.

Any ambiguity between type tested and partially tested assemblies from IEC 60439 have been replaced with 13 design verification characteristics, which clearly describe the individual tests that must be carried out.

Heat rise and the performance of devices inside a

functional unit (enclosure) within the low voltage switchgear and controlgear assembly is a major consideration for design

engineers. Heat rise test data provides information on the performance of the device and may lead to de-rating. The new standard IEC 61439 is applicable to: LV power distribution switchgear; motor control centres; control panels – lighting, PLC, industrial application, etc; meter- ing panels; wall mounted enclosures; sub distribution boards; busbar trunking systems and assemblies for construction sites.

Rittal T: 01709 704000

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Key differences between the standards

Enter 107 10 WINTER/SPRING 2014 Enclosure & Panel Building Solutions

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