PREASSEMBLED CABLE, NONMETALLIC CONDUIT 70-239

tension shall be adjusted to eliminate excessive sag. The cable shall have a clearance of not less than 2 inches (50.8 mm) from steel structural members or other conductive material. (2) Aerial cable shall have a clearance of not less than 10 feet (3.05 m) above floor areas accessible to pedestrian traffic, and not less than 14 feet (4.27 m) above floor areas accessible to vehicular traffic. (3) Cable suspended over work benches, not accessible to pedestrian traffic, shall have a clearance of not less than 8 feet (2.44 m) above the floor. (4) Aerial cables shall be permitted as a means to support lighting fixtures where the total load on the supporting messenger cable does not exceed that for which the assembly is intended. (5) The supporting messenger cable, where installed in conformity with the applicable provisions of Article 250 and if properly identified as an equipment grounding conductor, shall be permitted to ground equipment. The messenger cable shall not be used as a branch-circuit conductor. 342-8. Marking. Nonmetallic extensions shall be marked in accordance with Section 110-21.