National Electrical Code Article 314

National Electrical Code Article 314

National Electrical Code Article 314 LANES POINTS Article 314 Boxes and Fittings LANES POINTS This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information.

Article 314 Boxes and Fittings 314.5 Short-Radius Conduit Bodies. Conduit bodies such as capped elbows and serviceentrance elbows that enclose conductors 6 AWG or smaller, and are only intended to enable the installation of the raceway and the contained conductors, shall not contain splices, taps, or devices and shall be of sufficient size to provide free space for all conductors enclosed in the conduit body. LANES POINTS Article 314 Boxes and Fittings

314.15 Damp or Wet Locations. (A) In damp or wet locations, boxes, conduit bodies, and fittings shall be placed or equipped so as to prevent moisture from entering or accumulating within the box, conduit body, or fitting. Boxes, conduit bodies, and fittings installed in wet locations shall be listed for use in wet locations. LANES POINTS Article 314 Boxes and Fittings 314.16 Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies.

Boxes and conduit bodies shall be of sufficient size to provide free space for all enclosed conductors. In no case shall the volume of the box, as calculated in 314.16(A), be less than the fill calculation as calculated in 314.16(B). The minimum volume for conduit bodies shall be as calculated in 314.16(C). The provisions of this section shall not apply to terminal housings supplied with motors. LANES POINTS Article 314 Boxes and Fittings 314.16

(A) Box Volume Calculations. The volume of a wiring enclosure (box) shall be the total volume of the assembled sections and, where used, the space provided by plaster rings, domed covers, extension rings, and so forth, that are marked with their volume or are made from boxes the dimensions of which are listed in Table 314.16(A). (1) Standard Boxes. The volumes of standard boxes that are not marked with their volume shall be as given in Table 314.16(A). LANES POINTS Article 314 Boxes and Fittings

314.16 (1) Conductor Fill. Each conductor that originates outside the box and terminates or is spliced within the box shall be counted once, and each conductor that passes through the box without splice or termination shall be counted once. Unbroken conductor not less than twice the minimum length required for free conductors in 300.14 shall be counted twice. The conductor fill shall be calculated using Table 314.16(B). A conductor, not part of which leaves the box, shall not be counted. LANES POINTS

Article 314 Boxes and Fittings Exception: An equipment grounding conductor or conductors or not over four luminaire (fixture) wires smaller than 14 AWG, or both, shall be permitted to be omitted form the calculations where they enter a box from a domed luminaire (fixture) or similar canopy and terminate within that box. LANES POINTS Article 314 Boxes and Fittings A 3 x 2 (75mm x 50mm)

device box, 2-1/2 deep, has a volume of 12.5 cu. In. A 4 square box with a depth of 1-1/2 (38mm) has a volume of 21 cu. in LANES POINTS Article 314 Boxes and Fittings Volume shall be marked on all nonmetallic

boxes and boxes with a volume of 100 cu. In. or less except for boxes listed in Table 314.16(a) LANES POINTS Article 314 Boxes and Fittings Volume can be increased by using plaster (mud) rings,

domed covers, extension rings, or similar items The combined volume of this box and plaster ring is 28.5 cu. In. (21 + 7.5) LANES POINTS Article 314 Boxes and Fittings Determining the Number of Conductors Each conductor originating outside the box which is

terminated or spliced inside the box counts as one conductor. (314.16(b)(1) These (dark) conductors are counted as two (2) conductors. LANES POINTS Article 314 Boxes and Fittings Determining the Number of Conductors This box, as pictured, contains five (5) conductors. If all of the conductors are 12 AWG, the box could hold a maximum of nine [see Table 314.16(a) A conductor which passes through the

box without splice or termination (unbroken) counts as one conductor Each conductor originating outside the box that is terminated or spliced inside the box counts as one conductor These count as two (2) conductors LANES POINTS A conductor that does not leave the box, such as equipment bonding jumpers and pigtails, is not counted [314.16(b)(1)

Article 314 Boxes and Fittings Table 314.16(a) Metal Boxes LANES POINTS Article 314 Boxes and Fittings This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information. LANES POINTS

Article 314 Boxes and Fittings 314.16(b)(5) Pigtails are not counted. Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as one conductor. Only the largest equipment grounding conductor shall be counted if multiple grounding conductors enter the box

LANES POINTS Article 314 Boxes and Fittings Luminaire (Fixture) Studs and Hickeys Luminaire studs shall be counted as one conductor [314.16(b)(3) One or more hickeys shall be counted as one conductor [314.16(b)(3) LANES POINTS Article 314 Boxes and Fittings This single

pole switch counts as two 14 AWG conductors This duplex receptacle counts as two (2) 12 AWG conductors Each conductor yoke or strap counts as two conductors. A mounting yoke or strap can contain one or more devices, such as a

single duplex receptacle, a single switch, a double switch etc. The size of two conductors (when calculating box fill) shall be equal in size to the largest conductor connected to the device. LANES POINTS Article 314 Boxes and Fittings Table 314.16(b) lists the cubic inch volume for conductors, sizes 18 AWG through 6 AWG. Boxes, enclosures, and conduit bodies containing conductors size 4 AWG or larger, must also comply with 314.28 provision Volume Per Conductor

Table 314.15(b) LANES POINTS Article 314 Boxes and Fittings (A) These three conductors, although spliced, count as three (3) (B) Two conductors which terminate in the box count as two conductors (C) One receptacle counts as two (2) 12 AWG conductors

LANES POINTS Article 314 Boxes and Fittings (D) An unbroken conductor counts as one conductor. (E)These three equipment grounding conductors count as one (1) conductor (F) These two conductors terminating in the box are counted as two (2) conductors (at the receptacle) LANES POINTS

Article 314 Boxes and Fittings Total 12 AWG Conductors Volume per 12 AWG 12 2.25 cu. In Minimum Volume for conductors 12 x 2.25 = 27 cu. In Volume for box

21 + 6 = 27 cu. In. (including raised cover) This installation complies with 314.16 provisions LANES POINTS Article 314 Boxes and Fittings 314.16(c) General. Conduit bodies enclosing 6 AWG conductors or smaller, other than short radius conduit bodies as described in 314.5, shall have a cross sectional area not less than twice the cross

sectional area of the largest conduit or tubing to which it is attached. The maximum number of conductors permitted shall be the maximum number permitted by Table 1 of Chapter 9 for the conduit or tubing to which it is attached. LANES POINTS Article 314 Boxes and Fittings Splices Inside Conduit Bodies Splices, taps, or devices are

permitted inside conduit bodies, provided that the cu. In. capacity is durably and legibly marked on the conduit body by the manufacturer [314.16(c)(2) LANES POINTS Article 314 Boxes and Fittings At least 6 inches of free conductor (measured

from the point in the conduit body where it emerges from its raceway or cable sheath) shall be left at each outlet junction, and switch point [300.14] LANES POINTS Article 314 Boxes and Fittings A conduit body can be supported by rigid

metal conduit, intermediate metal conduit, rigid nonmetallic conduit, or electrical metallic tubing [314.23(e) LANES POINTS Article 314 Boxes and Fittings The maximum number of conductors, shall be calculated in

accordance with 314.16(b). Four 14 AWG conductors with a volume of 2.0 cu. In each require a total volume of 8 cu. In. LANES POINTS Article 314 Boxes and Fittings 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). This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (6322633) for more information. LANES POINTS Article 314 Boxes and Fittings 314.21 Repairing Plaster and Drywall or Plaster board. Plaster, drywall, or plasterboard surfaces that are

broken or incomplete around boxes employing a flush-type cover or faceplate shall be repaired so there will be no gaps or open spaces greater than 3 mm (1/8 in.) at the edge of the box. LANES POINTS This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information. Article 314 Boxes and Fittings 314.23 Supports.

Enclosures within the scope of this article shall be supported in accordance with one or more of the provisions in 314.23(A) through (H). (A) Surface Mounting. An enclosure mounted on a building or other surface shall be rigidly and securely fastened in place. If the surface does not provide rigid and secure support, additional support in accordance with other provisions of this section shall be provided. (B) Structural Mounting. An enclosure supported from a structural member of a building or from grade shall be rigidly supported either directly or by using a metal, polymeric, or wood brace. LANES POINTS

Article 314 Boxes and Fittings 314.23 Supports. (cont.d) (1) Nails and Screws. Nails and screws, where used as a fastening means, shall be attached by using brackets on the outside of the enclosure, or they shall pass through the interior within 6 mm in.) of the back or ends of the enclosure. Screws shall not be permitted to pass through the box unless exposed threads in the box are protected using approved means to avoid abrasion of conductor insulation. (~

LANES POINTS Article 314 Boxes and Fittings 314.23 Supports. (cont.d) (2) Braces. Metal braces shall be protected against corrosion and formed from metal that is not less than 0.51 mm (0.020 in.) thick uncoated. Wood braces shall have a cross section not less than nominal 25 mm x 50 rum (1 in. x 2 in.). Wood braces in wet locations shall be treated for the conditions. Polymeric braces shall be identified as being suitable for the use.

LANES POINTS Article 314 Boxes and Fittings 314.23 Supports. (cont.d) (C) Mounting in Finished Surfaces. An enclosure mounted in a finished surface shall be rigidly secured thereto by clamps, anchors, or fittings identified for the application. (D) Suspended Ceilings. An enclosure mounted to structural or supporting elements of a suspended ceiling shall be not more than 1650 cm3 (100 in.3) in size and shall be securely fastened in place in accordance with either (D)(1) or (D)(2).

LANES POINTS Article 314 Boxes and Fittings 314.25 Covers and Canopies. To complete the installation, each box must have a cover faceplate, lampholder, or luminaire (fixture) canopy. LANES POINTS Article 314 Boxes and Fittings 314.27(c) Floor Boxes Boxes listed specifically for the application shall be

used for receptacles located in the floor. LANES POINTS Article 314 Boxes and Fittings 314.27(d) Boxes at Ceiling Suspended (Paddle) Fan. This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information. LANES POINTS

Article 314 Boxes and Fittings 314.30(b) Handhole Enclosures Mechanical Raceway and Cable Connection LANES POINTS This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information. Article 314 Boxes and Fittings 320.30(b) AC Cable - Securing

LANES POINTS This material was extracted from Mike Holt Training Materials copyright 2007 by permission. Visit mikeholt.com or call 1.888.NEC.CODE (632-2633) for more information. Article 314 Boxes and Fittings 406.4(c) Receptacles Mounted on Covers Where receptacles are mounted and supported by a cover, they must be secured by more than one screw, unless the box cover or device assembly is listed and identified as single screw mounting.

LANES POINTS Article 314 Boxes and Fittings 410.20 Access to Outlet Boxes A means for connecting an equipment grounding conductor must be provided for luminaries with exposed metal parts

LANES POINTS

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