TEMPORARY WIRING

305-1. Scope. The provisions of this article apply to temporary electrical power and lighting wiring methods that may be of a class less than would be required for a permanent installation. 305-2. Other Articles. Except as specifically modified in this article, all other requirements of this Code for permanent wiring shall apply to temporary wiring installations. 305-3. Time Constraints. (a) During the Period of Construction. Temporary electrical power and lighting installations shall be permitted during the period of construction, remodeling, maintenance, repair, or demolition of buildings, structures, equipment, or similar activities. (b) 90 Days. Temporary electrical power and lighting installations shall be permitted for a period not to exceed 90 days for Christmas decorative lighting, carnivals, and similar purposes. (c) Emergencies and Tests. Temporary electrical power and lighting installations shall be permitted during emergencies and for tests, experiments, and developmental work. (d) Removal. Temporary wiring shall be removed immediately upon completion of construction or purpose for which the wiring was installed. 305-4. General. (a) Services. Services shall be installed in conformance with Article 230. (b) Feeders. Feeders shall be protected as provided in Article 240. They shall originate in an approved distribution center. Conductors shall be permitted within cable assemblies; or, cords or cables of a type identified in Table 400-4 for hard usage or extra-hard usage. Where the voltage does not I exceed 150 volts to ground and where not subject to physical damage, feeders shall be permitted to be run as open conductors if supported on insulators at intervals of not more than 10 feet (3.05 m). Exception: Where installed for the purposes specified in Section 305-3(c). (c) Branch Circuits. All branch circuits shall originate in an approved power outlet or panelboard. Conductors shall be permitted within cable assemblies; or, multiconductor cord or cable of a type identified in Table 400-4 for hard usage or extra-hard usage. All conductors shall be protected as provided in Article 240. Where the voltage does not exceed 150 volts to ground and where not subject to physical damage, branch circuits shall be permitted to be run as open conductors if supported on insulators at intervals of not more than 10 feet (3.05 m). No open wiring branch circuit conductors shall be laid on the floor or ground. Exception: Where installed for the purposes specified in Section 305-3(c). (d) Receptacles. All receptacles shall be of the grounding type. Unless installed in a continuous grounded metal raceway or metal-covered cable, all branch circuits shall contain a separate equipment grounding conductor, 70-158 NATIONAL ELECTRICAL CODE and all receptacles shall be electrically connected to the equipment grounding conductors. Receptacles on construction sites shall not be installed on branch circuits that supply temporary lighting. Receptacles shall not be connected to the same ungrounded conductor of multiwire circuits that supply temporary lighting. (e) Disconnecting Means. Suitable disconnecting switches or plug connectors shall be installed to permit the disconnection of all ungrounded conductors of each temporary circuit. Multiwire branch circuits shall be provided with a means to disconnect simultaneously all ungrounded conductors at the power outlet or panelboard where the branch circuit originated. Approved handle ties shall be permitted. (f) Lamp Protection. All lamps for general illumination shall be protected from accidental contact or breakage by a suitable fixture or lampholder with a guard. Brass shell, paper-lined sockets, or other metal-cased sockets shall not be used unless the shell is grounded. (g) Splices. On construction sites, a box shall not be required for splices or junction connections where the circuit conductors are multiconductor cord or cable assemblies or open conductors. See Sections 110- 14(b) and 400-9. A box, conduit body, or terminal fitting having a separately bushed hole for each conductor shall be used wherever a change is made to a conduit or tubing system or a metal-sheathed cable system. (h) Protection from Accidental Damage. Flexible cords and cables shall be protected from accidental damage. Sharp corners and projections shall be avoided. Where passing through doorways or other pinch points, protection shall be provided to avoid damage. (i) Termination(s) at Devices. Cables entering enclosures containing devices requiring termination shall be secured to the box with fittings designed for the purpose. 305-5. Grounding. All grounding shall conform with Article 250. 305-6. Ground-Fault Protection for Personnel. Ground-fault protection for personnel on construction sites shall be provided to comply with (a) or (b) below. (a) Ground-Fault Circuit-Interrupters. All 125-volt, single-phase, 15- and 20-ampere receptacle outlets that are not a part of the permanent wiring of the building or structure and that are in use by personnel shall have ground-fault circuit-interrupter protection for personnel. If a receptacle or receptacles are installed as part of the permanent wiring of the building or structure and used for temporary electric power, GFCI protection for personnel shall be provided. Exception: Receptacles on a 2-wire, single-phase portable or vehiclemounted generator rated not more than 5 kW, where the circuit conductors of the generator are insulated from the generator frame and all other grounded surfaces. (b) Assured Equipment Grounding Conductor Program. A written procedure shall be continuously enforced at the construction site by one or more designated persons to assure that equipment grounding conductors