§ 39.479. Temporary wiring.
(a) Employes shall not arrange the wiring of any temporary circuit for earth return, nor use bare conductors, particularly the temporary portions of shot firing circuits and to the leads of portable motors and lamps.
(b) Employes shall not employ temporary circuits without seeing that there are installed at the junction with the permanent wiring, suitable disconnecting switches or plug connectors, arranged to disconnect all conductors of the temporary circuit by a single operation.
(c) For shot firing circuits their disconnectors should be left open until the shot is to be fired, and should preferably be arranged for locking in the open position.
Cross References This section cited in 34 Pa. Code § 39.461 (relating to general requirements); and 34 Pa. Code § 39.471 (relating to general requirements).
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