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TITLE 30 - MINERAL RESOURCES
CHAPTER I - MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
SUBCHAPTER O - COAL MINE SAFETY AND HEALTH
PART 75 - MANDATORY SAFETY STANDARDS - UNDERGROUND COAL MINES
subpart i - UNDERGROUND HIGH - VOLTAGE DISTRIBUTION
75.800 - 3 - Testing, examination and maintenance of circuit breakers; procedures.
(a) Circuit breakers and their auxiliary devices protecting underground high-voltage circuits shall be tested and examined at least once each month by a person qualified as provided in 75.153; (b) Tests shall include: (1) Breaking continuity of the ground check conductor, where ground check monitoring is used; and (2) Actuating at least two (2) 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.
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