Specific nature of the influence (e.g., AC for altitude, AD for water).
Guarantees that the generator operates correctly during a power outage. 5. Summary of Key Clauses 551.1 - Scope: Covers generators up to low voltage. 551.4 - Protection: Safety measures (shock, fire). 551.5 - Selection: Choosing the correct protective devices.
: Rules for installations that are completely disconnected from the public utility.
IEC 60364‑5‑51 sets out the that govern the selection and erection of electrical equipment, regardless of the type of building or the specific equipment involved. According to the official scope:
The most current version as of 2025 is the , published on 14 April 2005 with the designation IEC 60364‑5‑51:2005 . This edition introduced several important changes, such as:
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If your interest is the section often mislabeled “Part 551,” it focuses on:
There is no standalone “IEC 60364 Part 551”. The correct reference is IEC 60364-5-51 , with clause 551 inside it.
The PDF details three primary operational topologies for integrating generating sets. 1. Parallel Operation with Public Grid
The standard mandates that equipment selection must consider:
: Supply to an installation as a backup mechanism in the event of a public utility failure.
Imagine designing a backup generator for a small data center. Using IEC 60364-5-551, you would:
The standard mandates mechanical or electrical interlocking to prevent simultaneous connection of mains and generator outputs to the same load.