The remains a vital tool for anyone managing electrical systems installed before 2014. It represents four decades of engineering practice. However, it is a historical document—not a guide for new construction.
Since 2014, the IEC 60439-1 standard has been withdrawn and replaced by (General Rules) and IEC 61439-2 (Power Switchgear). What changed? iec 60439-1 standard pdf
Testing the ability of the assembly and its busbars to handle high-current faults without damage. The remains a vital tool for anyone managing
: Units that exactly matched a design that had passed all required laboratory tests. Partially Type-Tested Assemblies (PTTA) iec 60439-1 standard pdf