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-   -   Do the neutrals for a light switch need to be in the same box as the switch? (http://www.diychatroom.com/f18/do-neutrals-light-switch-need-same-box-switch-41892/)

kornbln 04-06-2009 12:58 AM

Do the neutrals for a light switch need to be in the same box as the switch?
 
In the rough sketch below, can I tie the neutrals together in the jbox and run two hots through the conduit to the switch? or do the neutrals need to be in the switch box too? Both 14/2 NM cables will enter the jbox and transition to #14 THHN into the conduit.
http://home.comcast.net/~kornbln/sketch.jpg

kennzz05 04-06-2009 03:55 AM

no neutrals needed for the switch but y wouldnt you run the wire direct to the switch box from the panel than to the light? no jbox needed other than the one for the switch

Speedy Petey 04-06-2009 07:21 AM

What you have there is a switch loop and is very common, except for he junction box.
Why is that there?

joed 04-06-2009 08:01 AM

I agree. Why the J box. Why not go direct to the light or the switch?

kornbln 04-06-2009 08:23 AM

I had a feeling the question about the jbox would come up. Like I said, it's only a rough sketch.. So here's some more detail.

Whoever wired this before did it wrong, so I'm correcting it.

Two 14/2 NM cables are in the attic and run into a hole in the side of the house which go into an LB. One comes from the panel, the other goes to some exterior light fixtures. Inside the LB, both 14/2s are stripped of the outer sheath and fed into conduit on the side of the house as individual conductors (2 hots, 2 neutrals, and one ground). Grounds tied together in the LB. There is a switch at the end of this conduit so the lights can be controlled from outside the house. My plan is to install a jbox in front of the LB so I can transition from the NM to THHN/THWN.

Just for my own curiosity, would it be code compliant to make the splices inside the LB? This is 1/2" conduit and I think the cubic inch capacity of the LB is 4.5. Not too good with box fill calculations. Even if it's acceptable, I'll still likely use a jbox just for the sake of not having to cram all of the splices into the LB.


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