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Old 12-31-2008, 12:02 PM   #1
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Recessed light; max wires in junction box


Hi, I am installing a run of nine Halo recessed lights (new construction) that will be operated by a set of 3-way switches. All on/off together all the time. Each box is basically in a linear daisy chain start to finish, very simple run. Because of location of the stair switch, I'd like the power to come in from a middle of the run light (not an end point). The junction box cover states maximum 8 12 AWG, and I'd like to ask if my situation will violate that. Each J-box has three, four port push in connectors (hot, neutral, and ground) and my circuit is all 20 Amp, 12-2. So in the box, I will have the power coming in, and power going out to two branhces, as well as to the light itself. All four ports on each of the three connectors will be full. I am a bit confused at the counting rules, so I thought I'd just ask. Thanks!

Joe
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Old 12-31-2008, 12:25 PM   #2
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Recessed light; max wires in junction box


You are fine. What you propose is only for this one light and is only seven conductors. ALL the grounds only count as one.

I must ask, WHY #12???
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Old 12-31-2008, 12:26 PM   #3
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Recessed light; max wires in junction box


Each hot or neutral conductor counts one point. All the grounds together count one point. All the cable clamps, if any are inside the box, count as one point. For 12 gauge wires allow 2-1/4 cubic inches of box volume per point; 14 or smaller gauge conductors going to the light socket may be counted as 2 cubic inches even.

You have two conductors coming in for power, two conductors daisy chaining off away from the switch subsystem to other lights, three conductors (a 12-3) daisy chaining towards the switch subsystem and other lights, plus the grounds.

Assuming that the count of 8 does not include the two leads (tap conductors) going to "this" light, I would say you are OK.
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Old 12-31-2008, 12:28 PM   #4
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Recessed light; max wires in junction box


Allan, with boxes and lights like this the clamps are not counted. They are included in the manufacturer's calculations.
Also, I do not see where he says the 3-way will be part of this wiring scheme. He just wants to bring the switch leg into a middle light and "T" off from there.
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Old 12-31-2008, 12:37 PM   #5
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Recessed light; max wires in junction box


Speedy-Its a new house, and it is all 12 gauge, all 20 amp circuits so I wanted to stay consistent. AllenJ, no 12-3 at all going to this switch, I have only the two switches connected with three way, all the lights including this first mid-run have 12-2 wire going in. Thanks for the responses.
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Old 12-31-2008, 12:37 PM   #6
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Wires that neither leave nor enter the junction box (ex. the push in connector lead) are not part of the count.
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Old 12-31-2008, 12:50 PM   #7
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Speedy-Its a new house, and it is all 12 gauge, all 20 amp circuits

Thats just crazy! No wonder you bought Halo's... no money left in the budget.
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Old 12-31-2008, 01:03 PM   #8
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Recessed light; max wires in junction box


Come on Chris. I like Halo.

Good enough reason for me Yasla.
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Old 12-31-2008, 01:24 PM   #9
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Come on Chris. I like Halo.

Good enough reason for me Yasla.

I find the trims turn yellow after a year or so. Oh, and it was a sad attempt at humor also.
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Old 12-31-2008, 01:39 PM   #10
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Recessed light; max wires in junction box


but... it's ok to USE 12 if you get it for $15 for new 100 ft. rolls at an auction, yes?
i mean, it won't HURT anything, right?
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Old 12-31-2008, 02:59 PM   #11
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Recessed light; max wires in junction box


When you use #12 for lighting circuits the electrons flow too quickly resulting in brighter light. Install a dimmer and you'll be fine.

Speaking of dimmers, 9 cans @ 75 watts each is 675 watts. Keep in mind that you need a 3way, 1000W dimmer and that it will get hot.
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Old 01-01-2009, 11:41 AM   #12
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When you use #12 for lighting circuits the electrons flow too quickly resulting in brighter light.
What different would 12awg vs 14 awg make, other than slightly less voltage drop on the 12. Unless it was loaded pretty heavily how would you even notice a difference in the brightness of the light?

Jamie
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Old 01-01-2009, 01:22 PM   #13
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Recessed light; max wires in junction box


Feelin' a 'lil slow today Jamie?
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Old 01-01-2009, 01:34 PM   #14
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Feelin' a 'lil slow today Jamie?
Yes, feeling very slow today. It's already 1:30 here time for me to take a cold shower and wake up!
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Old 01-01-2009, 01:59 PM   #15
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I mean slow as in 221's sarcasm getting by you.
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