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fool4jesus

02:00PM | 11/17/06
Member Since: 06/20/05
53 lifetime posts
Bvelectrical
Hi, I've done quite a bit of electrical work around the house before but I have hit on something that makes no sense. I have done the calculations as to how many conductors you can fit into a box for the # of cubic inches. This all makes sense.

Now I am installing remodel-type recessed lights, with the built-in J box. This is a standard 6" remodeling non-IC can that you get from the Orange Box store. It says "Maximum of 8 No 12 conductors (4 in and 4 out)". I don't know what this means. I assumed at first the "8" was the normal conductor count. But that doesn't make a lot of sense. What I *want* to do is:

1. Connect a 12/2 as the supply

2. Connect two 12/2s to branch out to other recessed fixtures

It seems to me that that's no more than 4 in and 4 out. However, it seems to me that total conductor count here would be:

- 2 conductors each 12/2 cable (6 total)

- 2 conductors for the wire that feeds the light itself (2)

- 1 conductor for ground

That totals 9. What's more, the other thing that doesn't make sense is that the box is pretty tiny - I estimate about 12 cu in (3.5 x 2.5 x 1.5, more or less). How could you fit 8 12/2s in 12 cu in - wouldn't that require 18 cu in?


fool4jesus

06:01AM | 11/18/06
Member Since: 06/20/05
53 lifetime posts
What was I thinking? Who knows - must have been mesmerized by all the mentions of 12/2's on the fixture or the length of the workday yesterday :-)). I meant I want to run 14/2. I also forgot to include the wire connectors in my conductor count, so I'm up to 10, and 20 cubic inches.

househelper

05:18AM | 11/20/06
Member Since: 03/31/05
265 lifetime posts
The instructions with the fixture state "max 8 #12 conductors" That means you can run 4 12/2 or 1 12/2 and two 12/3 into this box. That's a little too crowded for my taste, but permitted. Since the instructions say this, you are allowed to do it per the NEC.

By using 14/2, you make things much easier and are well within the guidelines specified in the instructions.
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