A frequent point of confusion in generator installations is the handling of the neutral conductor. IEC 60364-5-551 provides guidance based on the earthing arrangement:
Mandating that equipment is selected based on foreseeable "external influences" such as temperature, moisture, and mechanical stress. Electrical Installation Guide Key Technical Clauses iec 60364 part 551 pdf
The standard does not apply to high-voltage generation or generating sets on vehicles (unless connected to a fixed installation). Its primary focus is on the interface between the (the grid) and the generating set . A frequent point of confusion in generator installations
So the PDF you download today will evolve — making it vital to always use the latest version. iec 60364 part 551 pdf