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Thread: NEC, Table 314.16(A) Metal Boxes

  1. #1
    Join Date
    Oct 2003
    Pennsville, N.J.

    NEC, Table 314.16(A) Metal Boxes

    My question is as follows, when I use Table 314.16 (A)Metal Boxes, I calculated the Cubic inches to be more than the Table shows. Can you please explain the difference.
    Example: A square box 4" x 4" x 1.5 = 24
    Table 314.16 (A) for that square box = 21 cu. in.
    I also notice that for all square box cu. in. calculations, that the Table is always 2 cu. in. less than my calculation. Please explain the difference. Thank-You in advance for your help.

  2. #2
    Join Date
    Feb 2003

    Re: NEC, Table 314.16(A) Metal Boxes

    I think it has something to do with the actual gross volume verses the minimum volume as specified in the Table. If a manufacturer makes a 4 x 4 x 1.5 box, it must have a minimum volume of 21 however the manufacturer can label their box with the actual volume as permitted if it exceeds the Table's value.

    [ November 05, 2004, 08:59 AM: Message edited by: bphgravity ]
    Bryan P. Holland, MCP

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