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mr500 03-24-2008 04:39 PM

3 way
 
Have a quick question on wiring 3 way switch. I want to come out of my panel into the overhead lights then down to the switch and of course on to the next 3-way. My question is can I run 12/2 from panel to the lights then down to the first switch THEN run 14/3 from this switch to the last 3 way. I know I CAN do it lol, just wanting to know does this throw up any red flags with me mixing the 12/2 and the 14/2 in the same run. Also it will fee out of a 15 amp circuit. There are about 4 fluorescent lights for this run.
Mike

chris75 03-24-2008 05:43 PM

Quote:

Originally Posted by mr500 (Post 110398)
Have a quick question on wiring 3 way switch. I want to come out of my panel into the overhead lights then down to the switch and of course on to the next 3-way. My question is can I run 12/2 from panel to the lights then down to the first switch THEN run 14/3 from this switch to the last 3 way. I know I CAN do it lol, just wanting to know does this throw up any red flags with me mixing the 12/2 and the 14/2 in the same run. Also it will fee out of a 15 amp circuit. There are about 4 fluorescent lights for this run.
Mike

ONLY if your breaker is a maximum of 15 amps...

mr500 03-24-2008 05:48 PM

yeah the lights WILL be on a 15 Amp breaker and Labeled such in the panel

CowboyAndy 03-24-2008 06:28 PM

Then why not just use 14/2 from the panel to the light?


BTW, I was hoping this was going to be a sex thread.

Guess not.

mr500 03-24-2008 06:39 PM

yeah sorry to disappoint ya..The heading is misleading I guess lmao



I don't have enough 14 to make the entire run or else I would. I need a few more feet and that is where the 12/2 comes in. The 3 way switch was added into the plans after I bought all my 12/2. A guy is giving me the 14/3 i need for the run so its FREE ..got to love free stuff :thumbup:

joed 03-24-2008 08:17 PM

If you are going panel L1 L2 L3 s1 s2 the you need 14/3 between the lights also.
It is not a code violation although it is not a professional way to do it.

mr500 03-24-2008 08:41 PM

If you are going panel L1 L2 L3 s1 s2 the you need 14/3 between the lights also.
It is not a code violation although it is not a professional way to do it.

Yes I think so.Im running into the lights first, then down to switch 1 then over to switch 2. Why do I need 14/3 between the lights? Wont the first wired light carry current to the other 2 when I flip the switch? If one light comes on why wont the other 2?. Am I missing something?

Thats the way I have it planned anyway lol

chris75 03-24-2008 09:24 PM

Quote:

Originally Posted by joed (Post 110481)
If you are going panel L1 L2 L3 s1 s2 the you need 14/3 between the lights also.
It is not a code violation although it is not a professional way to do it.


Why do you feel this method is not professional? I do this method quite often, it saves on material, box fill, and time...

darren 03-24-2008 09:35 PM

you will need 12/2 to your first light then 14/3 between all the lights.

Panel to Light 1-2 wires(Black-Hot White Neutral)
Light 1 to Light 2-3 wires(Black-constant hot(for switch), red-switched hot,
white neutral)
Carry on between each light as above.
Last light to first 3 way-2 wires(black to black(constant hot)
(white to red(switched hot)
Between switches-3 wire(one common and two travellers)
First switch-tie black(constant hot) onto common terminal
(white(from light) on to red from second switch)
(black and white from second switch onto travellers)
Second switch-red gets tied onto common
black and white get tied onto travellers

Hope this helps clarify things for you

jerryh3 03-24-2008 09:50 PM

http://www.wfu.edu/~matthews/courses/p230/switches.html

mr500 03-24-2008 10:14 PM

ok good. so if i read this correct I can use 2 conductor wired in parallel in between my lights?

Any of the above can be modified to control multiple lights. Additional lights are just wired in parallel with the first, using two conductor cable. The black should be connected to the black wire feeding the light and the white to the white wire feeding the light in all cases.

This is the way I had planed on doing it.:eek:

jerryh3 03-24-2008 10:33 PM

Quote:

Originally Posted by mr500 (Post 110547)
ok good. so if i read this correct I can use 2 conductor wired in parallel in between my lights?

Any of the above can be modified to control multiple lights. Additional lights are just wired in parallel with the first, using two conductor cable. The black should be connected to the black wire feeding the light and the white to the white wire feeding the light in all cases.

This is the way I had planed on doing it.:eek:

Yes. Look at the fourth picture down on this page.
http://www.wfu.edu/~matthews/courses...ariations.html

mr500 03-24-2008 10:48 PM

Yeah thats the one I was looking at. BUT in order to do it this way, I will need to go from the panel (power) to S1 then the lights then S2 INSTEAD of going to the lights first then the switches.

So I will run to S1 then lights, then back out to S2. Thanks that cleared everything UP.!!

Mike

joed 03-25-2008 08:18 PM

Quote:

Originally Posted by chris75 (Post 110520)
Why do you feel this method is not professional? I do this method quite often, it saves on material, box fill, and time...

The guage mixing is the unprofessional part, not the wiring sequence. It didn't come right now that I read it again.

chris75 03-25-2008 08:22 PM

Quote:

Originally Posted by joed (Post 110888)
The guage mixing is the unprofessional part, not the wiring sequence. It didn't come right now that I read it again.

So what do you do for voltage drop? I have no problems running #12 then continuing with # 14... the only thing non professional would be not to include voltage drop. IMO of course. :)


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