Strut-Type Channel Raceway
Part I. General
- Scope. This article covers the use, installation, and construction specifications of strut-type channel raceway.
Strut-Type Channel Raceway. A metal raceway that is intended to be mounted to the surface of or suspended from a structure, with associated accessories for the installation of electrical conductors and cables.
384.6 Listing Requirements. Strut-type channel raceways and accessories shall be listed and identified for such use.
Part II. Installation
384.10 Uses Permitted. The use of strut-type channel race‐ ways shall be permitted in the following:
- Where exposed.
- In dry locations.
- In locations subject to corrosive vapors where protected by finishes approved for the condition.
- As power poles.
- In hazardous (classified) locations as permitted in Chap‐ ter 5 .ARTICLE 386 — SURFACE METAL RACEWAYS 386.2
- As extensions of unbroken lengths through walls, parti‐ tions, and floors where closure strips are removable from either side and the portion within the wall, partition, or floor remains covered.
- Ferrous channel raceways and fittings protected from corrosion solely by enamel shall be permitted only indoors.
384.12 Uses Not Permitted. Strut-type channel raceways shall not be used as follows:
- Where concealed.
- Ferrous channel raceways and fittings protected from corrosion solely by enamel shall not be permitted where subject to severe corrosive influences.
- Size of Conductors. No conductor larger than that for which the raceway is listed shall be installed in strut-type chan‐ nel raceways.
- Number of Conductors. The number of conductors or cables permitted in strut-type channel raceways shall not exceed the percentage fill using Table 384.22 and applicable cross-sectional area of specific types and sizes of wire given in the tables in Chapter 9.
The adjustment factors of 310.15(B)(3)(a) shall not apply to conductors installed in strut-type channel raceways where all of the following conditions are met:
- The cross-sectional area of the raceway exceeds 2500 mm2 (4 in.2).
- The current-carrying conductors do not exceed 30 in number.
- The sum of the cross-sectional areas of all contained conductors does not exceed 20 percent of the interior cross-sectional area of the strut-type channel raceways.
384.30 Securing and Supporting.
- Surface Mount. A surface mount strut-type channel race‐ way shall be secured to the mounting surface with retention straps external to the channel at intervals not exceeding 3 m (10 ft) and within 900 mm (3 ft) of each outlet box, cabinet, junction box, or other channel raceway termination.
- Suspension Mount. Strut-type channel raceways shall be permitted to be suspension mounted in air with identified