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Old 10-31-2011, 02:35 PM   #1
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4x4 ceiling box max cable entries


what is the maximum # of cables entering and exiting a square 4x4 ceiling box, such as what is commonly used for lights and ceiling fans? is 5 too many? it does have 5 knockouts but was thinking it's too much wire inside a small box.
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Old 10-31-2011, 03:31 PM   #2
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4x4 ceiling box max cable entries


http://www.google.com/products/catal...ed=0CFEQ8gIwBA


that box?

depends on how deep and what gauge wire


each #14 is 2 cu in, # 12 is 2.25 all grounds count as one wire


1.5" deep is 15.8 ci

2 1/8" deep is 22.5 ci
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Old 10-31-2011, 04:46 PM   #3
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what is the maximum # of cables entering and exiting a square 4x4 ceiling box, such as what is commonly used for lights and ceiling fans? is 5 too many? it does have 5 knockouts but was thinking it's too much wire inside a small box.
The cable entries are irrelevant. As Techy said, it goes by volume.
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Old 10-31-2011, 11:00 PM   #4
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but i guess i could always go with an extension. all the 5 cables coming in are 14/2. so, if i use a 4x4x1.5 octagonal box with an extension that is that much, that is 48 ci, if the box was rectangular, knock off e.g. 5 for each one for the cut corners, that would be down to about 38 cu. 38/2 = 19 and i have 15 total (5 cables x 3 wires each cable), so i am good to go.

thanks
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Old 10-31-2011, 11:16 PM   #5
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4x4 ceiling box max cable entries


All grounds count as one. Five 14/2s is 11 x 2=22. Are you using built-in internal or external clamps?

Techy made a typo 4 x 2 1/8 is 21.5

Last edited by Code05; 10-31-2011 at 11:19 PM.
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Old 10-31-2011, 11:34 PM   #6
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how many wires fit in a 22cu/in box?................ All of them
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Old 11-01-2011, 05:08 AM   #7
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All grounds count as one. Five 14/2s is 11 x 2=22. Are you using built-in internal or external clamps?

Techy made a typo 4 x 2 1/8 is 21.5

page 15

http://www.tnb.com/contractor/docs/sc_indoorboxes.pdf
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Old 11-01-2011, 06:25 AM   #8
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An octagonal 8B box 1 1/2" deep has a volume of 15.5 according to Table 314.16(A).

Also remember that any cable would need to have the conductors extend 3" past the face of any extensions added to the box.
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Old 11-01-2011, 11:05 AM   #9
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I stand corrected, I used the volumes in T314.16.

Interesting, Raco lists their box volumes the same as the table.

Last edited by Code05; 11-01-2011 at 11:11 AM.
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Old 11-01-2011, 04:50 PM   #10
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it may be a typo on T&B's part aswell..
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Old 11-01-2011, 06:49 PM   #11
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it may be a typo on T&B's part aswell..
I think you may be correct. Here is a more modern T&B catalog and the box sizes match T314.16.

http://www.tnb.com/ps/endeca/index.c...t=&Ntk=&parts=
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