StacksVerified U.S. regulatory reference

46 CFR §183.378

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each ungrounded system must be provided with a suitably sensitive ground detection system located at the respective switchboard that provides continuous indication of circuit status to ground with a provision to momentarily remove the indicating device from the reference ground.