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3 way light switch

Posted on 11/25/19 at 11:28 am
Posted by rhmyhand
Baton Rouge
Member since Oct 2007
273 posts
Posted on 11/25/19 at 11:28 am
LINK

I want to connect the 12 lights to the light switches on either side of the building according to the wiring diagram at the top. It calls for a 12/3 from the first switch to the first light and also from the last light to the second switch. If I wires the 12 lights in a series I will end up back at the same side of the building that I started at. Do i then have to run a 12/3 from the last light in the series all the way back across the building to the 2nd light switch? Can I go from the 6th light to the second switch or does it have to be the last one?

Hope this make sense. Trying not to run a bunch of unnecessary wire.

Thanks in advance!
Posted by dakarx
Member since Sep 2018
8144 posts
Posted on 11/25/19 at 12:36 pm to


Posted by rhmyhand
Baton Rouge
Member since Oct 2007
273 posts
Posted on 11/25/19 at 1:34 pm to
So I think what you are showing me in the top diagram is that I can run a 3 wire from switch to switch, and then from the switch run a 2 wire to all my lights in a series?
Posted by Happygilmore
Happy Place
Member since Mar 2009
1828 posts
Posted on 11/25/19 at 3:47 pm to
quote:

So I think what you are showing me in the top diagram is that I can run a 3 wire from switch to switch, and then from the switch run a 2 wire to all my lights in a series?


i think if you do that you end up having to have one specific switch always on for the other one to work, i think thats how my hallway is wired and it pisses me off.

but to piggy back on this question, i put 6 recess lights in my living room on a 3 way switch, everything works perfect. my wife says they are to bright and she want to put a dimmer on them, how do i go about doing that, if i put it one one switch will it for for both switch locations?
Posted by dakarx
Member since Sep 2018
8144 posts
Posted on 11/26/19 at 9:12 am to
quote:

So I think what you are showing me in the top diagram is that I can run a 3 wire from switch to switch, and then from the switch run a 2 wire to all my lights in a series?


No, never in series... in parrallel.

If you don't understand why not to use a series circuit, please hire an electrician to finish the job while you get some education on the matter for the next time its needed. Leaving the fireman to watch tv and nap at the firehouse is always preferred!
This post was edited on 11/26/19 at 12:46 pm
Posted by dakarx
Member since Sep 2018
8144 posts
Posted on 11/26/19 at 9:19 am to
quote:

my wife says they are to bright and she want to put a dimmer on them, how do i go about doing that, if i put it one one switch will it for for both switch locations



I've never had the need to try it, but should work just fine, just be sure to get 3-way dimmer switches.

The fun part would be if a switch is on but fully dimmed (appears off) running back and forth flipping switches trying to figure out how to get the light on could be entertaining.
Posted by LSUtigerME
Walker, LA
Member since Oct 2012
3932 posts
Posted on 11/26/19 at 1:41 pm to
The wiring diagram you have is for a neutral switch loop. It involves utilizing the neutral as a current carrying wire (hot) between the lights and switches. It does have the ability to save some wire, but it can be quite confusing and more difficult to understand the current flow. The neutral/white wire must be taped with black tap to signify the hot neutral.

For my house, I didn’t utilize any switch loops. I bought a little extra wire, but 12ga wire is not that expensive. Clarity to me was more important.

A normal 3 way switch (how i ran all my circuits, regardless of a little extra wire) you’d run 12/2 from the breaker/source to the first switch, 12/3 from the first switch to 2nd, then 12/2 to each light.

All the lights are wired in “parallel”, but you can split and branch to each light as required. You can have 1 wire in, and 2 each if necessary. For example, the wire in from the switch, then one out to next light in sequence, and one to the light on the side of it.
Posted by rhmyhand
Baton Rouge
Member since Oct 2007
273 posts
Posted on 11/27/19 at 12:20 pm to
Thank you, much appreciated.
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