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

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