SURFACE RACEWAYS

70-261 (FPN): See Section 353-3 for multioutlet assemblies. 352-6. Combination Raceways. Where combination surface metal raceways are used both for signaling and for lighting and power circuits, the different systems shall be run in separate compartments identified by sharply contrasting colors of the interior finish, and the same relative position of compartments shall be maintained throughout the premises. 352-7. Splices and Taps. Splices and taps shall be permitted in surface metal raceway having a removable cover that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. Splices and taps in surface metal raceways without removable covers shall be made only in junction boxes. All splices and taps shall be made by approved methods. 352-8. General. Surface metal raceways shall be of such construction as will distinguish them from other raceways. Surface metal raceways and their elbows, couplings, and similar fittings shall be so designed that the sections can be electrically and mechanically coupled together and installed without subjecting the wires to abrasion. Where covers and accessories of nonmetallic materials are used on surface metal raceways, they shall be identified for such use. 352-9. Grounding. Surface metal raceway enclosures providing a transition from other wiring methods shall have a means for connecting an equipment grounding conductor. B. Surface Nonmetallic Raceways 352-21. Description. Part B of this article shall apply to a type of surface nonmetallic raceway and fittings of suitable nonmetallic material that is resistant to moisture and chemical atmospheres. It shall also be flameretardant, resistant to impact and crushing, resistant to distortion from heat under conditions likely to be encountered in service, and resistant to lowtemperature effects. Surface nonmetallic raceways that have limitedsmoke-producing characteristics shall be permitted to be identified with the suffix LS. 352-22. Use. The use of surface nonmetallic raceways shall be permitted in dry locations. They shall not be used (1) where concealed; (2) where subject to severe physical damage; (3) where the voltage is 300 volts or more between conductors, unless listed for higher voltage; (4) in hoistways; (5) in any hazardous (classified) location except Class I, Division 2 locations as permitted in the exception to Section 501-4(b); (6) where subject to ambient temperatures exceeding those for which the nonmetallic raceway is listed; nor (7) for conductors whose insulation temperature limitations would exceed those for which the nonmetallic raceway is listed. 352-23. Other Articles. Surface nonmetallic raceways shall comply with the applicable provisions of Article 300. 70-262 NATIONAL ELECTRICAL CODE 352-24. Size of Conductors. No conductor larger than that for which the raceway is designed shall be installed in surface nonmetallic raceway. 352-25. Number of Conductors in Raceways. The number of conductors installed in any raceway shall be no greater than the number for which the raceway is designed. 352-26. Combination Raceways. Where combination surface nonmetallic raceways are used both for signaling and for lighting and power circuits, the different systems shall be run in separate compartments, identified by printed legend or by sharply contrasting colors of the interior finish, and the same relative position of compartments shall be maintained throughout the premises. 352-27. General. Surface nonmetallic raceways shall be of such construction as will distinguish them from other raceways. Surface nonmetallic raceways and their elbows, couplings, and similar fittings shall be so designed that the sections can be mechanically coupled together and installed without subjecting the wires to abrasion. 352-28. Extension Through Walls and Floors. It shall be permissible to extend unbroken lengths of surface nonmetallic raceways through dry walls, dry partitions, and dry floors. (FPN): See Section 353-3 for multioutlet assemblies. 352-29. Splices and Taps. Splices and taps shall be permitted in surface nonmetallic raceways having a removable cover that is accessible after installation. The conductors, including splices and taps, shall not fill the raceway to more than 75 percent of its area at that point. Splices and taps in surface nometallic raceways without removable covers shall be made only in junction boxes. All splices and taps shall be made by approved methods.