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Evolution in IEC61439-1/2

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Crewman

Evolution in IEC61439-1/2

Are you aware about the recent revision in IEC61439-1 ?

Do you know about the technical changes that are being incorporated in the latest edition?

Does it have significant impact on the existing range of offers?

 

Do post your queries / visit this forum for further details on the latest edition of IEC61439-1

 

Regards

S.Saravaanan

Principle Technical Expert

2 REPLIES 2
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Re: Evolution in IEC61439-1/2

Dear Expert

Can you explain in brief about the technical change in the revised standard.

Is there any impact in the design because of this evolution? If so what are the impacts in design / testing?

 

Thanks You

Regards

Magma Switchgears

 

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Crewman

Re: Evolution in IEC61439-1/2

The IEC61439-1; edition 3 was published in the begining of May 2020. This third edition cancels and replaces the second edition which was published in 2011. There are few significant technical changes in included in thelatest edition namely:

 

1. Integration of electronic systems such as VFD, SMPS, UPD etc..although these electronic components are tested to their

    respective products standard, but when they are incorporated in assemblies the incorporation should be in accordance with

    the IEC 61439 series.

 

2. New terminology - Group rated Current of circuit & more emphasis on temperature rise verification on this characteristics.

 

3. Recognition of Aluminium as conductor with very well defined temperature rise criteria limits - 55K for Untreated Aluminium 

     to aluminium Joints

 

4. Increase in the test duration from 5 second to 60 second in case of Dielectric verification for the power frequency test.

 

5. Addition of requirements in respect of DC

 

6. Introduction of the concept of class I and class II assemblies regarding protection against electric shock.

 

There will be no significant impact on the existing solutions that are complying to edition 2 except on the temperature rise criteria's for Aluminium conductor. An rise of 55k on Al-Al joint is adapted so as to ensure safety & performance of the solution over a prolonged duration of service.

 

This is because, the Al-Al joints readily oxidizes and result in formation of strong insulating oxide layer which hinders the transfer of electrons resulting into thermal avalanche and subsequent thermal failure. Hence the criteria limit is set at 55K for an Al-Al joint in order to over come the above said problem.

 

Hope we have addressed your queries. Do revert back in case of any clarifications.

 

Regards

S.Saravanan

Principle Technical Expert