384-Strut-Type Channel Raceway

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I. General

ARTICLE 384

384.22 Number of Conductors. The number of conduc- tors 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 derating factors of 310.15(B)(2)(a) shall not apply to conductors installed in strut-type channel

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

384.2 Definition.

Strut-Type Channel Raceway. A metallic 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 race- ways, closure strips, and accessories shall be listed and identified for such use.

II. Installation

384.10 Uses Permitted. The use of strut-type channel raceways shall be permitted in the following:

(1) Where exposed.

(2) In dry locations.

(3) In locations subject to corrosive vapors where pro- tected by finishes judged suitable for the condition.

(4) Where the voltage is 600 volts or less.

(5) As power poles.

(6) In Class I, Division 2 hazardous (classified) locations as permitted in 501.10(B)(3).

As extensions of unbroken lengths through walls, par-
titions, and floors where closure strips are removable from either side and the portion within the wall, parti- tion, or floor remains covered.
(8) 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.

384.21 Size of Conductors. No conductor larger than that for which the raceway is listed shall be installed in strut-type channel raceways.

raceways where all of the following conditions are met:

(1) The cross-sectional area of the raceway exceeds

2500 mm 2 (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, calculated in accordance with the following formula for wire fill:

_ ca

wa

where: n = number of wires

ca = hannel area in square inches

wa = wire area

384.30 Securing and Supporting.

(A) Surface Mount. A surface mount strut-type channel raceway 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.

(B) Suspension Mount. Strut-type channel raceways shall be permitted to be suspension mounted in air with approved appropriate methods designed for the purpose at intervals not to exceed 3 m (10 ft) and within 900 mm (3 ft) of channel raceway terminations and ends.

Table 384.22 Channel Size and Inside Cross-Sectional Area

Area 40% Area* 25% Area" Size

Channel in. 2 mm2 in.2 mm2