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-   -   Help Determining Proper Junction Box Size (https://www.diychatroom.com/f18/help-determining-proper-junction-box-size-655247/)

gilliger 03-11-2019 01:13 PM

Help Determining Proper Junction Box Size
 
I am doing some updating in our kitchen and wanted to make sure my box is large enough to contain all the splices, etc. and am having a hard time calculating it.

I plan to use a 3-gang old work box with these specs: 5.72-Inch Length by 2.79-Inch Width by 3.69-Inch Depth. I believe it's 55 cubic inches.

I plan to take the incoming 12/2 line and pigtail off of it to
1 GFCI outlet (end run)
2 separate switches
1 hardwired undercabinet light
(obviously the 12/2 running from the switches to the lights)

The lights were previously wired with a switch loop. I didn't want to go that route, primarily because I don't have any 12/3 and wanted to stay up to code having a neutral available in all switch locations.

Any help would be appreciated and sorry if this is confusing.

hkstroud 03-11-2019 01:46 PM

Re: Help Determining Proper Junction Box Size
 
Google NEC 370-16 (a)

HandyAndyInNC 03-11-2019 02:05 PM

Re: Help Determining Proper Junction Box Size
 
I would never mix power and lighting on the same circuit. You are only asking to be in the dark if you happen to kick a breaker. I would also use one of the device boxes as my junction box. I would never have a junction box any where in the circuit other than a device box. I would gang 2 or maybe three boxes together to ensure I have plenty of room.



But I like making thing easy for myself when it comes to electrical hardware and circuits.


Andrew
Handy Andy In Mt Airy NC

CodeMatters 03-11-2019 03:30 PM

Re: Help Determining Proper Junction Box Size
 
I wouldn't waste time calculating. I'd use a plastic box and forget about it.
It'll easily be big enough for your needs.

Note: I'm assuming that plastic boxes are larger than metal where you are,
same as they are here where I am.

Edit: another note - plastic boxes often have "wings/tabs" on the end of the
box (away from the stud) that make their mounting simpler since you don't
have to make/add anything to the end of the box to prevent it from pulling
forward when the devices are screwed in.

CodeMatters 03-11-2019 03:41 PM

Re: Help Determining Proper Junction Box Size
 
Quote:

Originally Posted by HandyAndyInNC (Post 5789441)
I would never mix power and lighting on the same circuit.


Mixed circuits in residential is something about 1 in a hundred people care about........I'm not one of 'em.

brric 03-11-2019 04:11 PM

Re: Help Determining Proper Junction Box Size
 
If the GFCI is part of a small appliance branch circuit, it cannot be part of a lighting circuit.

Jim Port 03-11-2019 05:48 PM

The plastic.box will be stamped with the number of conductors and capacity.The

As above the small appliance circuits should not have lighting on them.


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