IEC standards are copyrighted; obtain the official IEC 60364-5-51 PDF through:
When you access the official PDF, the document is organized into specific clauses: Topic Covered Scope and general compliance rules 551.2 Source characteristics and power ratings 551.3 Protection against direct and indirect contact 551.4 Overcurrent protection engineering 551.5 Parallel operation requirements with other sources 551.6 Requirements for standby system switching Compliance and Sourcing
Meet national wiring regulations, which are frequently adapted directly from the IEC 60364 framework.
Generators that provide backup power during a main grid failure.
IEC 60364 is a comprehensive international standard series for low-voltage electrical installations. Specifically, (Clause 551) addresses "Other equipment" – with Clause 551 dedicated to Low-voltage generating sets .