30 CFR § 77.800-1 Testing, examination, and maintenance of circuit breakers; procedures.
(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.
