This part works in conjunction with Part 1 . It adds specific requirements for power switchgear assemblies (typically used for heavy industrial distribution, main switchboards, and motor control centers). Where Part 1 says "general rules," Part 2 says "and here is what is special for power assemblies."
Every assembly leaving the factory must undergo: iec 614391 and 2 pdf
The IEC website offers a red-line preview (comparing old vs. new editions) for free, but not the full PDF. This part works in conjunction with Part 1