PART XXXIII USE OF ELECTRICITY IN MINES — Trailing and cable repair
685
(1) An employer shall, in consultation with the occupational health and safety committee, the worker health and safety representative or the workplace health and safety designate, conduct a formal hazard assessment and develop a written safe work procedure for the handling, use and maintenance of electrical trailing cables in accordance with CSA Standard M421 "Use of Electricity in Mines".
685(2)
Trailing cables supplying mobile electrical equipment at a voltage of more than 300 volts, including grounding conductors, shall meet CSA Standard C-22.2 #96M "Portable Power Cables" and the following specifications:
685(a)
the cable-filling material shall be rubber or another synthetic material with similar properties;
685(b)
the phase conductors shall be of a gauge equal to or larger than No. 8 AWG;
685(c)
the grounding conductors shall be uninsulated or shall be covered with a semi-conducting insulation or shall have a total conductance equal to or greater than 60% of that of the largest phase conductor;
685(d)
the grounding conductors shall be equal to or larger than No. 8 AWG;
685(e)
where the insulated monitoring conductor in a cable supplying energy to a single piece of equipment is supplied to it by a separate power source, the energy supplying the equipment shall be disconnected when the conductors of the separate energy source are cut or when a grounding conductor is broken;
685(f)
where they are transmitting electrical power at a potential exceeding 750 volts to ground, they shall have a grounded sheathing consisting of tinned copper wire mesh or equivalent around each power conductor;
685(g)
the cables shall enter metal frames of motors, splice boxes, and electric compartments only through acceptable termination fittings;
685(h)
the trailing cables shall be secured to machines and to the switchgear by approved cable gland or plug and socket couplings, to protect the cables from damage and to prevent strain on the electrical connections;
685(i)
the trailing cables to transportable electrical equipment shall be provided at its point of entry of supply with a switch or equivalent disconnecting device;
685(j)
where conducting-rubber materials are used in cable construction, the control switch shall provide sensitive ground-fault protection capable of automatically tripping the control switch at a ground-fault level of 750mAa or less;
685(k)
the jackets on cables shall be unpainted; and
685(l)
where for underground use, they shall have a non-flammable covering, suitably identified.
685(3)
Where a person is handling an energized trailing cable, the person shall use suitable protective equipment.
685(4)
A trailing cable in use shall be tested by an electrician at regular intervals and by the operator prior to start of shift.
685(5)
Damaged trailing cables shall be inspected by a qualified person before they are returned to service, to ensure that they are in safe operating condition and defective trailing cables shall be removed from service.
685(6)
Permanent repairs to damaged trailing cables shall be made by a qualified person who shall examine and test the trailing cables for continuity and insulation integrity before they are allowed to go back into service.
685(7)
Permanent splices or repairs in trailing cables shall be mechanically strong, with equivalent electrical conductivity as other sections of the cable and be effectively insulated and sealed to prevent moisture penetration.
Not legal advice. Verify the cited article against the signed agreement.