Article 384

Strut-Type Channel Raceway

Part I. General

  1. Scope. This article covers the use, installation, and construction specifications of strut-type channel raceway.
  2. Definition.

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:

  1. Where exposed.
  2. In dry locations.
  3. In locations subject to corrosive vapors where protected by finishes approved for the condition.
  4. As power poles.
  5. In hazardous (classified) locations as permitted in Chap‐ ter 5 .ARTICLE 386 — SURFACE METAL RACEWAYS 386.2
  6. 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.
  7. 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:

  1. Where concealed.
  2. Ferrous channel raceways and fittings protected from corrosion solely by enamel shall not be permitted where subject to severe corrosive influences.
  1. Size of Conductors. No conductor larger than that for which the raceway is listed shall be installed in strut-type chan‐ nel raceways.
  2. 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:

  1. The cross-sectional area of the raceway exceeds 2500 mm2 (4 in.2).
  2. The current-carrying conductors do not exceed 30 in number.
  3. 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.

  1. 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.
  2. Suspension Mount. Strut-type channel raceways shall be permitted to be suspension mounted in air with identified