what table list these cubic in?

[steveng]

?Determine the minimum cubic inches required for two 10 TW conductors passing through a box, four 14 THHN conductors spliced in the box, two 12 TW conductors terminating to a receptacle, and one 12 AWG equipment bonding jumper from the receptacle to the box.

 

[480sparky]

Box fill question: 314

 

[steveng]

sparky, i know the article,

sparky, i know the article,

could you be slightly more helpful?

 

[480sparky]

Start at 314.16(B). 10s require 2.5 in? (1), 14s require 2 in? (1), 12s require 2.25 in? (1), device is counted as 2 12s (4), ground wire counts one 12 (5). I'm not sure about the 14s. Are there two coming in and two going out, or four coming in and four going out? TW and THHN are simply to throw you off. In box fill, 10s are 10, regardless of insulation.

 

[steveng]

:grin: i see it now, thanks
i had a brain fog...
i could'nt see the forest for the trees

thats 22.5, cu in. , right?

 

[480sparky]

Took me a while, too. It's been a while since I did one of those. :smile:

 

[480sparky]

I get 24.25

Two 10s @ 2.50 = 5.00 (1)
four 14s @ 2.00 = 8.00 (1)
Two 12s @ 2.25 = 4.50 (1)
Two more 12s for the device @ 2.25 = 4.50 (4)
One #12 ground @ 2.25 = 2.25 (5)

 

[steveng]

the answer in the test was 22, ( mikes, test)
i did not count the bonding jumperd egc, since it does not leave the box.
314.16 B 1

 

[Dennis Alwon]

the answer in the test was 22, ( mikes, test)
i did not count the bonding jumperd egc, since it does not leave the box.
314.16 B 1

I agree with you that the bonding jumper does not get counted. I bet sparky knows that but was thinking there was an EGC in the box. Answer is 22 cu. inches

 

[480sparky]

Maybe I'm misunderstanding 314.16(B)(5).

 

[Dennis Alwon]

Maybe I'm misunderstanding 314.16(B)(5).

314.16(B)(1) Last sentence before the exception says it all.