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09-13-2007, 08:47 PM   #1
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## Maximum wires in a junction Box

Ok. I'm wiring my own house and I'm out of breakers. (Yup. Too many small circuits.)

Question is, how many 12/2 wires can I get into a 4X4 junction box ? So as it stands now, I have 1 wire from the panel feeding a box with 2 circuits. Can I add an additional 1 or 2 circuits as long as I don't exceed 20 AMPS ?

Thanks,
Tom

09-13-2007, 08:57 PM   #2

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For the first part of the question, it depends on the depth of the box and if there are any integral cable clamps inside.

As to the rest of the question, it makes no sense. One wire feeding a box with two circuits? Add circuits without exceeding 20A? I don't understand.

 09-13-2007, 09:05 PM #3 Member   Join Date: Jul 2007 Location: Jacksonville, FL Posts: 886 Rewards Points: 500 I think Guiness book of wold records was 82, just before the house burned down.

 09-13-2007, 09:08 PM #4 Newbie   Join Date: Aug 2007 Location: Northwest CT Posts: 11 Rewards Points: 10 Ok. Perhaps I've worded this wrong. I'll need to measure the box to be sure. It looks like a 4X4X1.5 box. From my panel, I have 1 12/2 wire going into the box feeding a bedroom and another small run of 3 outlets. Hence 1 (12/2)wire in, 2 (12/2) wires coming out of the box. Can I add a 3rd (12/2)wire and feed another run of outlets ? Thanks, Tom
 09-13-2007, 09:25 PM #5 Licensed Pro   Join Date: Mar 2007 Location: SC Posts: 1,571 Rewards Points: 1,000 If it is a 4x4x1.5in metal box with the clamps external to the box, then yes you can. If the clamps are internal, then three 12/2 is all you can have. You can add a box extension or a plaster ring to increase the volume if you need to.
 09-14-2007, 08:00 AM #6 Member   Join Date: Sep 2007 Posts: 50 Rewards Points: 25 why are you installing 20 amp circuits?
 09-14-2007, 09:27 AM #7 Member   Join Date: Jun 2007 Posts: 3,772 Rewards Points: 204 And how can you be out of circuits. What size panel did you install. You should have someone look at how many circuits (home runs) you have installed, you may be very surprized.
 09-14-2007, 07:25 PM #8 Electrician   Join Date: Aug 2007 Location: Connecticut, Litchfield Posts: 2,015 Rewards Points: 1,000 Where are you located in CT? I work in the northwest corner....
09-16-2007, 06:15 PM   #9
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Everyone...

Thanks for the responses. I'm all set.....

Yup. All 20 amp circuits ! Why ? I believe in overkill. I'm building my own house to the extreme in some sitsuations.... and in this sitsuation too. Too many circuits. I know many of them can be combined and I have done that to get where I need.

Will I ever reach the 20 AMP limit ? I hope not but at least the wiring is there if I ever need it.

Tom

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