30 CFR §75.518
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Automatic circuit-breaking devices or fuses of the correct type and capacity shall be installed so as to protect all electric equipment and circuits against short circuit and overloads. Three-phase motors on all electric equipment shall be provided with overload protection that will deenergize all three phases in the event that any phase is overloaded.