7 Pa. Code § 139.74 - Temporary wiring
(a) Feeders
must be provided with overcurrent protection in accordance with the load
imposed and conductor size as specified in Article 240 of the National
Electrical Code.
(b)
Branch circuits must originate in an approved power outlet or panelboard.
Conductors shall be permitted within multiconductors. Conductors shall be
protected by overcurrent devices at their rated capacity.
(c) Receptacles must be of the grounding
type. Unless installed in a complete metallic raceway, branch circuits must
contain a separate equipment grounding conductor and all receptacles must be
electrically connected to the grounding conductor.
(d) Bare conductors or earth returns may not
be used for the wiring of a temporary circuit.
(e) Suitable disconnecting switches or plug
connectors shall be installed to permit the disconnection of ungrounded
conductors of a temporary circuit.
(f) Lamps for general illumination exclusive
of decorative or festoon lighting shall be protected from accidental contact or
breakage. Protection shall be provided by elevation of at least 7 feet from a
normal working surface or by a suitable fixture or lamp-holder with a
guard.
(g) Temporary wiring over
600 volts shall be permitted during periods of construction, tests, experiment
or emergency. A less permanent class of wiring and equipment shall be permitted
than would be required for permanent installations.
(h) Suitable fencing, barriers or other
effective means shall be provided to prevent access of other than authorized
and qualified personnel to temporary wiring over 600 volts.
(i) Temporary wiring over 600 volts shall be
removed immediately upon completion of construction or purpose for which the
wiring was installed.
(j) Temporary
electric wiring, if suspended, shall be supported so that its protective
insulation will not be damaged.
(k)
Overcurrent protection devices may not be installed in neutral or grounding
conductors.
(l) Where electrical
power is supplied for an amusement ride by a generating system, the generator
and equipment must be properly grounded.
(m) Receptacles and attachment plugs must be
of the grounding type and have ground fault interrupter (GFI)
protection.
(n) Electrical
installations and each electrically powered amusement ride must be effective as
to noncurrent carrying metal parts which may become energized and which are
exposed to contact by personnel. The path to ground from circuits, equipment
and conductor enclosures must:
(1) Be
permanent and continuous.
(2) Have
ample carrying capacity to conduct currents liable to be imposed on
it.
(3) Have impedance, as
evidenced by testing, sufficiently low to limit the potential above ground and
to facilitate the operation of the overcurrent devices in the
circuit.
(o) Grounding
which does not have a resistance to ground of 25 ohms or less as evidenced by
testing shall be augmented by additional electrodes as needed spaced not less
than 6 feet apart.
(p) Temporary
electrical lines placed at ground level must be of the "S" or equivalent type
and be adequately insulated and protected in areas of vehicular or pedestrian
traffic to provide the maximum public safety.
Notes
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No prior version found.