Program Policy Manual - VOLUME V - Mine Safety and Health ...

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MSHA PROGRAM POLICY MANUAL VOLUME V 8. Any type of work performed inside rooms, vaults, substations and other similar enclosures where energized parts or conductors are exposed 9. Any type of work performed inside transformers, power centers, rectifiers, switch boxes, switch houses, panels and other enclosures of electric equipment or conductors 10. Electrical troubleshooting and testing 11. Handling energized high-voltage power cables (see Section 75.812) Listed below are examples of work that is not required to be performed by a qualified person or by a person trained to perform electrical work and maintain electric equipment under the direct supervision of a qualified person: 1. operation of electric equipment; 2. normal operation of control switches, switch boxes, or circuit breakers, provided no energized parts or conductors are exposed; 3. operation of cutout switches in trolley circuits; 4. hanging or removing fuse nips on or from trolley wires; 5. changing bits; 6. lubrication; 7. handling energized trailing cables; 8. inserting low- and medium-voltage cable couplers into receptacles or withdrawing low- and medium-voltage cable couplers from receptacles; 9. transportation of electric equipment and cables; 10. mechanical repairs on electrically-powered equipment, provided no energized parts or conductors are exposed; 11. installation and repair of equipment and circuits in which shock hazards do not exist (having a nominal rating February 2003 (Release V-33) 57
MSHA PROGRAM POLICY MANUAL VOLUME V of 40 volts or less), provided such equipment is not required to be permissible; and 12. installation, repair, and guarding of trolley wires and trolley feeder wires. Section 75.510 states that energized trolley wires may be repaired only by a person trained to perform electrical work and to maintain electrical equipment. Repair work is not required to be performed by a qualified person but must be performed by a person trained to repair and maintain energized trolley wires. However, electrical work, such as connecting a feeder wire inside the enclosed housing of a rectifier, is required to be performed by a qualified person or by a person trained to perform electrical work and to maintain electrical equipment under the direct supervision of a qualified person. The phrase "under the direct supervision of a qualified person" must, as a minimum, include the following: 1. The qualified person shall examine and/or test an electric circuit or machine and determine the need for repair or maintenance; 2. The qualified person must give specific instructions to the employee assigned to perform this work with respect to the nature and extent of the repairs to be performed and, where necessary, prescribe the manner in which the work is to be performed; 3. The qualified person is, at all times, under continuing duty to instruct, advise, or consult with the employee in the event the work which he has assigned cannot be performed by the employee in the manner prescribed; and 4. The qualified person must examine and test, if necessary, the completed work before the circuit is energized or the machine is returned to service. When a cable splice is made by a person other than a qualified person, the splice shall be inspected by a qualified person prior to reinsulation of the power conductors and prior to and after the final outer jacket is applied. Testing and troubleshooting of energized equipment shall be done only by qualified persons, except that a person trained to February 2003 (Release V-33) 58
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