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Subject - pull box depth
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veganfan
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My fundamental wiring class book ask the depth of pull box I need. I have found how to size box by 8x largest size race way or 6x largest if u pull plus other race ways ect. Also box fill in cubic inches needed for plugs ect. Any way book tells me I have 3 inch raceway going strait threw so 8x3in = 24in, but depth ? How do you figure that not by fill size becouse this would be less than 3in, and can not put 3in raceway unless box at least 3in depth? I know standard at work 4in and 6in deep, but is there some code I need to fallow? Why else would they ask this question? My instructor not shure, but looking. any help would be gratefull.
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Ryan_J
| What is the size of conductors? Size it in accordance with Table 312.6(A), as per the exception to 314.28(@)
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veganfan
| conductor size not given. I could go off of maxium area allowed to be used by 3in emt, but even at this the 3in x 8 gives 24in x 24in more than enough fill room for conductors even at a 1in depth. ofcouce 1in not big enough for 3in emt.
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cs409
| NEC article 370 covers your dos and donts... as to what you need..
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KSsparky
| If your 3" conduits are in one side and out the other, or any other configuration which doesn't involve leaving the back of the box, there is no requirement for depth other than being able to get your 3" connector, locknut and bushing on.
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David Hyatt
| I agree with sparky, unless conduits are leaving back of box there is nothing to limit the depth but having room enough for lock nuts and bushings.
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veganfan
| Thanks to everyone this is what I came up with too, but was unsure why the asked it if no set code for it. Must be trick question, but I thought I would check in case I missed something.
PS this site is great!
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cs409
| sometimes text books have mistakes, sometimes they are trick questions, but one thing it does, it makes you read and think...and ask questions
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