5, Temporary Wiring, except that approved flexible cables and

cords shall be permitted to be laid on floors where protected from contact by the general public. (c) Emergency Systems. Control of emergency systems shall comply with Article 700, Emergency Systems. 518-4. Wiring Methods. The fixed wiring methods shall be metal raceways, nonmetallic raceways encased in not less than 2 inches (50.8 mm) of concrete, Type MI cable, or Type MC cable. Exception No. 1: Nonmetallic-sheathed cable, type AC cable, electrical nonmetallic tubing, and rigid nonmetallic conduit shall be permitted to be installed in those buildings or portions thereof that are not required to be fire-rated construction by the applicable building code. Exception No. 2: As provided in Article 640, Sound-Recording and Similar Equipment, in Article 800, Communication Circuits, and in Article 725 for Class 2 and Class 3 remote-control and signaling circuits, and in Article 760 for fire protective signaling circuits. 70-564 NATIONAL ELECTRICAL CODE (FPN): Fire-rated construction is the fire-resistive classification used in building codes. 518-5. Supply. Portable switchboards and portable power distribution equipment shall be supplied only from listed power outlets of sufficient voltage and ampere rating. Such power outlets shall be protected by overcurrent devices. Such overcurrent devices and power outlets shall not be accessible to the general public. Provisions for connection of an equipment grounding conductor shall be provided. The neutral of feeders supplying solid-state, 3-phase, 4-wire dimmer systems shall be considered a currentcarrying conductor.