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Old 11-08-2012, 07:50 PM   #1
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How to rough in 2 rooms on one circuit - lighting


I have a 20-amp circuit that is going to two bedrooms for lighting... right now it comes into one room into the switch box (plastic 20.5 cu in) then a line from that runs to a set of 4 75watt recessed lights.. that is it... this new room needs to be fed from that switch box, but that would put probably too many wires in that box?

20.5 cu inch box with 3 12/2 lines seems overcrowed.. think the max is 9 12 gauge wires?

how would you route something like this? or should a 2 gang box with a mud ring be used? or just a smarter routing method? thanks!

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Old 11-08-2012, 08:12 PM   #2
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How to rough in 2 rooms on one circuit - lighting


3 x12/2 is 6
1ground
plus 2 for the switch
total 9
X 2.25
equals
20.25

Your box is OK.

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Old 11-08-2012, 08:13 PM   #3
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How to rough in 2 rooms on one circuit - lighting


Quote:
Originally Posted by rjniles View Post
3 x12/2 is 6
1ground
plus 2 for the switch
total 9
X 2.25
equals
20.25

Your box is OK.
oh? we don't count the ground wire for each run?
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Old 11-08-2012, 08:15 PM   #4
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How to rough in 2 rooms on one circuit - lighting


All ground wires count as one.
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Old 11-08-2012, 08:15 PM   #5
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How to rough in 2 rooms on one circuit - lighting


All grounds count as 1.
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Old 11-08-2012, 08:16 PM   #6
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How to rough in 2 rooms on one circuit - lighting


Quote:
Originally Posted by rjniles View Post
All grounds count as 1.

ah ok, that's what confused me with the box sizing then, I was counting it all
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Old 11-08-2012, 08:16 PM   #7
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How to rough in 2 rooms on one circuit - lighting


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All ground wires count as one.
Damn, you are fast.
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Old 11-08-2012, 08:17 PM   #8
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How to rough in 2 rooms on one circuit - lighting


Saves me some time from having to replace the box at least!
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House Information: Build 1996, 1500 sq ft basement, 1500 sq ft 1st floor, 800 sq ft 2nd floor, 560 sq ft unfinished attic space on 2nd floor. Insulation: Attic blown fiberglass, walls R-19, Basement R-19. HVAC: Trane xc95m fully modulating furnace, single zone, Trane XL20i commiunicating AC unit, TCONT900 Communicating thermostat.
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Old 11-08-2012, 08:19 PM   #9
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How to rough in 2 rooms on one circuit - lighting


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Damn, you are fast.
Only when needed!

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