Product Brochure

www.carlon.com

Article 314 — Outlet, Device, Pull, and Junction

Boxes; Conduit Bodies; Fittings; and Manholes

I. SCOPE AND GENERAL

314.1 Scope. This article covers the installation and use of

all boxes and conduit bodies used as outlet, device, 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.

314.2 Round Boxes. Round boxes shall not be used

where conduits or connectors requiring the use of lock nuts

or bushings are to be connected to the side of the box.

314.3 Nonmetallic Boxes.

Nonmetallic boxes shall be

permitted only with open wiring on insulators, concealed

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

nonmetallic sheaths, flexible cords, and nonmetallic raceways.

Exception No. 1: Where internal bonding means are provided

between all entries, nonmetallic boxes shall be permitted to

be used with metal raceways or metal-armored cables.

Exception No. 2: Where integral bonding means with a

provision for attaching an equipment bonding jumper inside

the box are provided between all threaded entries in non-

metallic boxes listed for the purpose, nonmetallic boxes shall

be permitted to be used with metal raceways or metal-

armored cables.

314.4 Metal Boxes. All metal boxes shall be grounded in

accordance with the provisions of Article 250.

314.17 Conductors Entering Boxes, Conduit

Bodies, or Fittings. Conductors entering boxes, conduit

bodies, or fittings shall be protected from abrasion and shall

comply with 314.17(A) through (D).

(A) Openings to Be Closed. Openings through which

conductors enter shall be adequately closed.

(B) Metal Boxes and Conduit Bodies. Where metal

boxes or conduit bodies are installed with open wiring

or concealed knob-and-tube wiring, conductors shall

enter through insulating bushings or, in dry locations,

through flexible tubing extending from the last

insulating support to not less than 6 mm (

/4 in.)