Enclosure Support Requirements

A wood brace used for supporting a box for structural mounting shall have a cross-section not less than nominal ______.

a) 1 in. x 2 in.
b) 2 in. x 2 in.
c) 2 in. x 3 in.
d) 2 in. x 4 in.

See answer and applicable Code reference

The correct answer is: a) 1 in. x 2 in.

The provisions of Art. 314 cover the installation and use of all boxes and conduit bodies used as outlet, device, junction or pull boxes, and handhole enclosures. Support requirements are outlined in Sec. 314.23. As noted in 314.23(B)(2), "Metal braces shall be protected against corrosion and formed from metal that is not less than 0.020 in. thick uncoated. Wood braces shall have a cross section not less than nominal 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."

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