30 C.F.R. § 77.800-1 Testing, examination, and maintenance of circuit breakers; procedures.
Title 30 - Mineral Resources
(a) Circuit breakers and their auxiliary devices protecting high-voltage circuits to portable or mobile equipment shall be tested and examined at least once each month by a person qualified as provided in §77.103. (b) Tests shall include: (1) Breaking continuity of the ground check conductor where ground check monitoring is used; and, (2) Actuating any of the auxiliary protective relays. (c) Examination shall include visual observation of all components of the circuit breaker and its auxiliary devices, and such repairs or adjustments as are indicated by such tests and examinations shall be carried out immediately.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart I—Surface High-Voltage Distribution
§ 77.800-1 Testing, examination, and maintenance of circuit breakers; procedures.
