30 CFR 77.902
§ 77.902 Low- and medium-voltage ground check monitor circuits.
United States · 30 CFR — Mineral Resources · Status: effective
Cite this
- Citation
- 30 CFR 77.902, § 77.902 Low- and medium-voltage ground check monitor circuits, United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/134120
- Permanent ID
ys:prov:134120@1- SHA-256
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Full text
On and after September 30, 1971, three-phase low- and medium-voltage resistance grounded systems to portable and mobile equipment shall include a fail safe ground check circuit or other no less effective device approved by the Secretary to monitor continuously the grounding circuit to assure continuity. The fail safe ground check circuit shall cause the circuit breaker to open when either the ground or pilot check wire is broken. Cable couplers shall be constructed to cause the ground check continuity conductor to break first and the ground conductor last when being uncoupled when pilot check circuits are used.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.