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DOE-HDBK-1092-2004
8.0 TEMPORARY WIRING
It is required that temporary wiring comply with all the requirements pertaining to permanent
wiring unless specific exceptions are stated, which can be found in NEC Article 527.
The following codes and standards will aid in designing, installing, and inspecting temporary
wiring methods and using portable electric hand tools.
1. Articles 230, 527, and 400 of the National Electrical Code (NEC 2002)
2. Chapter 4 of NFPA 70E, Standard for Electrical Safety in the Workplace.
8.1
REQUIREMENTS AND INSTALLATION CONDITIONS OF USE
Temporary electrical installations shall be allowed during periods of construction, remodeling,
maintenance, repair, or demolition of equipment or structures or for experiments and
developmental work. However, such temporary installations are not substitutes for permanent
installations and shall be removed as soon as the construction, remodeling, experiment, or other
special need is completed.
8.1.1
CONTACT PREVENTION
Except as modified in Article 527, temporary wiring shall meet all the requirements of the NEC
for permanent wiring to prevent accidental contact by workers or equipment.
8.1.2
VERTICAL CLEARANCES
Vertical clearance of wires, conductors, and cables above ground shall meet the requirements
of NEC.
8.1.3
WET LOCATIONS
Conductors with nonrated weather-proof insulation shall not be enclosed in metal raceways or
used for wiring in tanks, penstocks, or tunnels. Receptacles used in damp or wet locations shall
be approved for the purpose. When a receptacle is installed outdoors (outdoors is considered a
wet location), it shall be contained in a weatherproof enclosure, the integrity of which would not
be affected when an attachment plug is inserted.
All temporary lighting strings in outdoor or wet locations, such as tunnels, culverts, valve pits,
outlets, and floating plants, shall consist of lamp sockets and connection plugs permanently
molded to the hard service cord insulation.
8.1.4
SUPPORTS
Bare or open conductors shall be insulated from their supports. This requirement prevents
arcing, sparking, or flash-over to grounded objects. Open wiring for temporary installations is
only allowed as per NEC Section 527.
8-1


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