StacksVerified U.S. regulatory reference

30 CFR §77.902-2

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Ground check systems not employing pilot check wires shall be approved by the Secretary only after it has been determined that the system includes a fail safe design causing the circuit breaker to open when ground continuity is broken.