What is a Class 4 power system?

The NEC categorizes electrical circuits; most fall under the category of “Wiring Methods”, and then there are class rated electrical systems, which don’t need a fuse box or breaker panel. The 4 class ratings that exist, as of the release of the 2023 edition of the NEC, are Class 1, 2, 3, and 4 (fault-managed power systems). Class 4 rated power systems can supply high-voltage DC power safely, while making use of low-voltage wiring practices, because of their fault-management technology. They are considered safe from both a fire and electric shock standpoint.

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