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Section 7

Boxes and Supports

Reference NEC Article 314 Outlet, Device, Pull and Junction

Boxes, Conduit Bodies, Fittings, and Manholes.

314.1. Scope. This article covers the installation and use of

all boxes and conduit bodies used as outlet, junction, or pull

boxes, depending on their use, and manholes and other

electric enclosures intended for personnel entry. Cast, sheet

metal, nonmetallic, and other boxes such as FS, FD, and

larger boxes are not classified as conduit bodies. This article

also includes installation requirements for fittings used to

join raceways and to connect raceways and cables to boxes

and conduit bodies.

314.3. Nonmetallic Boxes. Nonmetallic boxes shall be per-

mitted only with open wiring on insulators, concealed knob-

and-tube wiring, cabled wiring methods with entirely non-

metallic sheaths, flexible cords, and nonmetallic raceways.

Questions about ENT

1. CAN I SUPPORT A 20 POUND FIXTURE FROM A

CARLON

NONMETALLIC CEILING BOX THAT IS

FIRMLY SUPPORTED

FROM THE STRUCTURE?

Yes. See NEC Sections 314.33 and 314.27. Maximum

fixture weight for a Carlon ceiling box listed for fixture

support is 50 pounds.

WHAT SPECIAL REQUIREMENTS MUST I ADHERE

TO FOR THE INSTALLATION OF A CARLON NON-

METALLIC BOX IN A FIRE RESISTIVE WALL?

a. Precautions must be taken to assure that the wall

openings are not oversized. The clearance between the

edge of the box and the wall should not exceed

/8 inch

(see NEC Section 314.20).

b. If nonmetallic boxes are installed on opposite sides

of the fire resistive wall assembly without the use of

mineral wool batt insulation, must be separated by a

horizontal distance of 24 inches. Mineral wool batt can

also be used to achieve a 7 inch separation. Putty pads