You can download the IEC 60439-1 PDF from the official IEC website or other authorized sources.
Comprehensive Guide to IEC 60439-1: Installation, Maintenance, and Transition to IEC 61439 iec 604391 pdf install
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Updated guidelines for and wiring connections.
IEC 60439-1 standard, titled "Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies," withdrawn and replaced IEC 61439 series