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Article 366 Auxiliary Gutters Part I. General 366.1 Scope. This article covers the use, installation, and construction requirements of metal auxiliary gutters and nonmetallic auxiliary gutters and associated fittings. ENHANCED CONTENT Collapse An auxiliary gutter provides additional gutter space for...

Article 366 Auxiliary Gutters Part I. General 366.1 Scope. This article covers the use, installation, and construction requirements of metal auxiliary gutters and nonmetallic auxiliary gutters and associated fittings. ENHANCED CONTENT Collapse An auxiliary gutter provides additional gutter space for wiring in various types of electrical enclosures and equipment. This additional gutter space may be necessary to provide sufficient room for the number of conductors in an enclosure or to provide adequate wiring bending/deflection space where conductors connect to a terminal. Although the construction of an auxiliary gutter is no different from that of a wireway, the field application of this equipment differentiates an auxiliary gutter from a wireway. A wireway is a raceway in accordance with the definition of raceway in Article 100. Auxiliary gutters supplement enclosure wiring spaces and are not encompassed by the definition of raceway. Therefore, NEC requirements that apply only to raceways do not apply to auxiliary gutters. An example of such a requirement is 230.7, which prohibits service conductors from being installed in a raceway with conductors that are not service conductors. This rule applies to wireways installed in accordance with Articles 376 and 378. However, an auxiliary gutter installed to supplement the wiring space of a service equipment enclosure is not a wireway; therefore, service conductors, feeder conductors, and branch-circuit conductors can occupy the same wiring space of an auxiliary gutter. Unlike wireways, which are covered in Articles 376 and 378, auxiliary gutters are permitted to contain bare and insulated copper and aluminum busbars. See 366.23(A) for the ampere rating of bare copper and aluminum busbars installed in auxiliary gutters. 366.6 Listing Requirements. (A) Outdoors. Nonmetallic auxiliary gutters installed outdoors shall be listed for all of the following conditions: Exposure to sunlight Use in wet locations Maximum ambient temperature of the installation Indoors. Nonmetallic auxiliary gutters installed indoors shall be listed for the maximum ambient temperature of the installation. ENHANCED CONTENT Collapse The sections and associated fittings of auxiliary gutters are identical to those of wireways. They differ only in their intended use. If listed, they may be marked as “Wireway,” “Auxiliary Gutter,” or “Wireway or Auxiliary Gutter,” depending on the intended application. Part II. Installation 366.10 Uses Permitted. (A) Sheet Metal Auxiliary Gutters. (1) Indoor and Outdoor Use. Sheet metal auxiliary gutters shall be permitted for indoor and outdoor use. Wet Locations. Sheet metal auxiliary gutters installed in wet locations shall be suitable for such locations. Nonmetallic Auxiliary Gutters. Nonmetallic auxiliary gutters shall be listed for the maximum ambient temperature of the installation and marked for the installed conductor insulation temperature rating. Informational Note: Extreme cold may cause nonmetallic auxiliary gutters to become brittle and therefore more susceptible to damage from physical contact. (1) Outdoors. Nonmetallic auxiliary gutters shall be permitted