Article 388 Surface Nonmetallic Raceways
Surface Nonmetallic Raceway. A nonmetallic raceway that is intended to be mounted to the surface of a structure, with associated couplings, connectors, boxes, and fittings for the installation of electrical conductors.
- The use of surface nonmetallic raceways shall be permitted in dry locations.
- Extension through walls and floors shall be permitted. Surface nonmetallic raceway shall be permitted to pass transversely through dry walls, dry partitions, and dry floors if the length passing through is unbroken. Access to the conductors shall be maintained on both sides of the wall, partition, or floor.
- Where concealed, except as permitted in 388.10(2)
- Where subject to severe physical damage
- Where the voltage is 300 volts or more between conductors, unless listed for higher voltage
- In hoistways
- In any hazardous (classified) location, except as permitted by other articles in this Code
- Where subject to ambient temperatures exceeding those for which the nonmetallic raceway is listed
- For conductors whose insulation temperature limitations would exceed those for which the nonmetallic raceway is listed
Surface nonmetallic raceways and fittings are made of suitable nonmetallic material that is resistant to moisture and chemical atmospheres. It shall also be flame retardant, resistant to impact and crushing, resistant to distortion from heat under conditions likely to be encountered in service, and resistant to low-temperature effects.