Product Brochure

www.carlon.com

Section 3

Wood and Metal Stud Construction

Reference NEC Section 362.10 Uses Permitted: The use of

electrical nonmetallic tubing and fittings shall be permitted:

(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. (see Section 3,

Table 3-1 in this manual.) The 15-minute-finish-rated ther-

mal barrier shall be permitted to be used for combustible

or noncombustible walls, floors, and ceilings.

Exception: Where a fire sprinkler system(s) is installed in

accordance with NFPA 13-1999, Standard for the Installation

of Sprinkler Systems, on all floors, ENT is permitted to be

used within walls, floors, and ceilings, exposed or concealed,

in buildings exceeding three floors above grade.

Reference NEC Section 300.4 Protection Against Physical

Damage: Where subject to physical damage, conductors

shall be adequately protected.

(a) Cables and Raceways Through Wood Members.

Bored Holes. In both existing and concealed locations,

where a cable or raceway-type wiring method is installed

through bored holes in joists, rafters, or wood members,

holes shall be bored so that the edge of the hole is not

less than 1

/4 inch (31.8 mm) from the nearest edge of

the wood member. Where this distance cannot be main-

tained, the cable or raceway shall be protected from pene-

tration by screws or nails by a steel plate or bushing, at

least

/16 inch (1.59 mm) thick, and of appropriate length

and width installed to cover the area of the wiring.

Exception: Steel plates shall not be required to protect rigid

metal conduit, intermediate metal conduit, rigid nonmetal-

lic conduit, or electrical metallic tubing.