UL Standard for Safety Surface Metal Raceways and Fittings
|Publication Date:||26 February 2004|
These requirements cover surface metal raceways and fittings for use in accordance with the National Electrical Code, NFPA 70.
Raceways of the following thicknesses are intended to enclose circuits operating at potentials not exceeding 600 volts between conductors:
a) Raceways that are entirely of metal at least 0.040 inch (1.02 mm) thick nominal and
b) Raceways consisting of nonmetallic covers on metal bases of the thickness indicated in (a).
Thinner all-metal raceways or raceways of thinner metal bases with nonmetallic covers are intended to enclose circuits operating at potentials lower than 300 volts between conductors.
These requirements do not cover cable trays, wireways or nonmetallic raceways.
A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.