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314.21 Repairing Plaster and Drywall or

Plaster-board. Plaster, drywall, or plasterboard surfaces

that are broken or incomplete shall be repaired so there will

be no gaps or open spaces greater than 3 mm (

⁄8 in.) at

the edge of the box or fitting.

314.22 Exposed Surface Extensions. Surface

extensions from a flush-mounted box shall be made by

mounting and mechanically securing an extension ring over

the flush box. Equipment grounding and bonding

shall be in

accordance with Article 250.

Exception: A surface extension shall be permitted to be

made from the cover of a flush-mounted box where the

cover is designed so it is unlikely to fall off, or be removed if

its securing means becomes loose. The wiring method shall

be flexible for a length sufficient to permit removal of the

cover and provide access to the box interior, and arranged so

that any bonding or grounding continuity is independent of

the connection between the box and cover.

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.

(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 (

⁄4 in.)

of the back or ends of the enclosure.

(2) Braces. Metal braces shall be protected against

corrosion and formed from metal that is not less

than 0.020 in. (508 µm) thick uncoated. Wood

braces shall have a cross section not less than

nominal 1 in.  2 in. Wood braces in wet locations

shall be treated for the conditions. Polymeric braces

shall be identified as being suitable for the use.