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Section 10

Article 362 and Associated Articles

Note: All references to the National Electrical Code

are based on the 2002 edition.

Article 362 – Electrical Nonmetallic Tubing:

Type ENT

I. GENERAL

362.1 Scope. This article covers the use, installation, and

construction specifications for electrical nonmetallic tubing

(ENT) and associated fittings.

362.2 Definition. Electrical Nonmetallic Tubing (ENT).

A nonmetallic pliable corrugated raceway of circular cross

section with integral or associated couplings, connectors,

and fittings for the installation of electric conductors. ENT is

composed of a material that is resistant to moisture and

chemical atmospheres and is flame retardant.

A pliable raceway is a raceway that can be bent by hand

with a reasonable force, but without other assistance.

362.6 Listing Requirements. ENT and associated fit-

tings shall be listed.

II. INSTALLATION

362.10 Uses Permitted.

For the purpose of this article,

the first floor of a building shall be that floor that has 50

percent or more of the exterior wall surface area level with or

above finished grade. One additional level that is the first level

and not designed for human habitation and used only for

vehicle parking, storage, or similar use shall be permitted. The

use of ENT and fittings shall be permitted in the following:

(1) In any building not exceeding three floors above grade

a. For exposed work, where not prohibited by 362.12

b. Concealed within walls, floors, and ceilings

(2) In any building exceeding three floors above grade, ENT

shall be concealed within walls, floors, and ceilings

where the walls, floors, and ceilings provide a thermal

barrier of material that has at least a 15-minute finish

rating as identified in listings of fire-rated assemblies. The

15-minute-finish-rated thermal barrier shall be permitted

to be used for combustible or noncombustible walls,

floors, and ceilings.