PART XXXIII USE OF ELECTRICITY IN MINES — Protection of underground cables
691
(1) Suitable circuit breakers and disconnectors shall be inserted in the feeder conductors connected to underground cables.
691(2)
Circuit breakers and disconnectors shall be readily accessible and as close as practicable to the point of connection between the supply circuit and underground cables.
691(3)
Instruments indicating the presence of ground leaks shall be installed on an ungrounded distribution network whose voltage exceeds 300 volts.
691(4)
Ground leak protection devices to automatically isolate a defective circuit shall be installed on a neutral grounded distribution network whose voltage exceeds 300 volts.
Not legal advice. Verify the cited article against the signed agreement.