box fill

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grayeagle

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most of my work has been resid, and because 99.99 %of the box's are plastic the box's tell you how many wires are permited in the box. i looked in the NEC book to try and figure out the square inches of a 6x6x4 box and wire fill. this is what was my understanding of it 6x6x4=144 sq. in./ 9# 10s x2.50=22.50/ 19#12s x2.25=42.75/ 10#14s x2.00=10 . total=75.25 sq. in. box minimum need for all the wire. the grnds are included in the count as one for each wire size. am i doing this wrong ?
 
grayeagle said:
most of my work has been resid, and because 99.99 %of the box's are plastic the box's tell you how many wires are permited in the box. i looked in the NEC book to try and figure out the square inches of a 6x6x4 box and wire fill. this is what was my understanding of it 6x6x4=144 sq. in./ 9# 10s x2.50=22.50/ 19#12s x2.25=42.75/ 10#14s x2.00=10 . total=75.25 sq. in. box minimum need for all the wire. the grnds are included in the count as one for each wire size. am i doing this wrong ?
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What did you do when you had 14s and 12s entering a plastic box in a bath or kitchen?

Your EGC counts as one of the largest conductors as per 314.16(B)5
 
You would have a hard time exceeding the conductor fill with the box that you're using.
 
kjw444 said:
Just a thought but don't forget about your devices.
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sorry i did forget abou the chase 2 nipples i the j box. i also should have told you that this box is used to bring in the old wires into the new panel because the old one was only 8" wide.
 
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