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.
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."
About the Author
Mike Holt
Mike Holt is the owner of Mike Holt Enterprises (www.MikeHolt.com), one of the largest electrical publishers in the United States. He earned a master's degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to produce seminars, videos, books, and online training for the trade as well as contribute monthly Code content to EC&M magazine.
