Here are simple answers to 3 other questions about the new IEC standard :
4) Why have the different parts of the standard (switchboards, busbar trunking…) changed?
The structure has changed to be consistent with the IEC 60947-X switchgear and controlgear standards. The power switchboards are now covered by a specific standard, IEC 61439-2, whereas it was covered by a general rules standard.
5) Is the new standard in force for all kinds of LV Assemblies (switchboards, busbar trunking…)?
No. Only IEC 61 439-2 for power assemblies and IEC 61 439-1 for general rules are available. The other parts are scheduled by 2011. That’s why the standards IEC 60439-1 & -2 are still valid for the busbar trunking systems.
6) Should the tests carried out according to the IEC 60439-1 standard be redone according to the new standard?
No. It is only necessary to do the additional tests, such as the temperature rise test of each circuit loaded with its rated current and the lifting test.