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How to connect two 3-way switches at opposing ends of a hallway

How to connect two 3-way switches at opposing ends of a hallway


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Old 01-15-14, 07:11 PM
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How to connect two 3-way switches at opposing ends of a hallway

Does there need to be separate power sources to both ends of hallway for two 3-way switches?

Switch A:
12-2 Romex electrical cable from circuit breaker 5
12-3 Romex electrical cable to switch B

Switch B:
12-2 Romex electrical cable from circuit breaker 5 via junction box
12-3 Romex electrical cable from switch A
12-2 Romex electrical cable to lights

My question is, do I need to have the 12-2 electrical cable in switch B?
 
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Old 01-15-14, 07:19 PM
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No. The hot black at A connects to common. The black from the light at B connects to the common there. There is no need for a power in at 2. Power from A to B is carried by the two travelers.
 
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Old 01-15-14, 09:31 PM
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3-way switches

Here are a couple drawings for 3-way switching.

Name:  3-WAY SWITCHES.jpg
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Old 01-20-14, 07:49 PM
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Thanks guys. I'm just going to make things simpler and do it right with how Ray is saying. Since the power for my 2nd switch (i.e., switch B) has power coming from the 12-3 electrical cable travelers, then I am just going to remove the 12-2 electrical cable going into that switch.
 
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Old 01-20-14, 07:56 PM
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You cannot power another switch from the travelers of the other switch.
 
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Old 01-23-14, 12:22 AM
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But pcboss, Ray is saying that you can power a switch (i.e., switch B) from the travelers of another switch (i.e., switch A).
 
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Old 01-23-14, 05:18 AM
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Switch B is part of the same circuit. PCboss means a switch on a second circuit.
 
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Old 01-26-14, 06:51 AM
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I really don't understand what pcboss is saying. So, am I ok to just remove the 12-2 Romex electrical cable from switch B as written in my original post?
 
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Old 01-26-14, 09:20 PM
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Originally Posted by pcboss
You cannot power another switch from the travelers of the other switch.
I really don't understand what pcboss is saying.
PCboss is saying that an additional switch for an an additional set of lights cannot be fed from the wiring coming to Switch B from Switch A. That's true, but that's not what you're trying to do so you don't need to worry about it.

So, am I ok to just remove the 12-2 Romex electrical cable from switch B as written in my original post?
In your original post you wrote:
Switch B:
12-2 Romex electrical cable from circuit breaker 5 via junction box
12-3 Romex electrical cable from switch A
12-2 Romex electrical cable to lights
It's not only OK, it's good practice to remove the power feed from the panel from the box for Switch B. You have a panel feed to the box for Switch A and you don't need a second one.

You will need the cable going to the lights.
 
 

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