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Old 03-27-2012, 11:30 AM   #16
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Two 2-wire cables legal in three-way circuit?


The way it was commonly done is use one cable as a constant power and neutral, and the other cable as the two travelers. I don't see it being a problem if they are ran next to each other as they sound like they are. What you don't want is the two cables taking different paths through the house, which produces an EM field becuase the hot (travellers) and neutral are not ran together. This was done sometimes when the cable carrying the hot and nuetral came from a different box as the one carrying the three way & travelers.

The part that I don't understand is when you say "use both whites as neutral."

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Old 03-27-2012, 04:23 PM   #17
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Two 2-wire cables legal in three-way circuit?


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Certain wiring configurations of three ways are switch loops. The ones with power feed at the fixture are switch loops. The ones with power feed at one switch going to second switch and then fixture are not switch loops.
i'll go for that.just took a while to catch what you said.
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Old 03-27-2012, 04:32 PM   #18
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Two 2-wire cables legal in three-way circuit?


reconsidered the example

Last edited by k_buz; 03-27-2012 at 05:48 PM.
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Old 03-27-2012, 05:37 PM   #19
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Two 2-wire cables legal in three-way circuit?


Thanks, everyone, for the replies. I'm less than clear, but I think the consensus is that it's not a great idea, but probably legal. In any case, I've finally found an electrician who will return my calls, so hopefully I'll make it his problem.

Terry
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Old 03-27-2012, 05:47 PM   #20
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Two 2-wire cables legal in three-way circuit?


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Would you consider this legal?

hot comes to one of the 3way switches
a 2 wire to the 2nd 3way containing the travelers
a 2 wire to the 2nd 3 way containing either the hot or the switch leg and the neutral
switch leg comes out of the other 3 way switch

If not, why?
I would not because there is a code rule that says hots and neutral must be in the same cable or conduit or raceway. You have split the hot and neutral into two different cables.
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Old 03-27-2012, 05:49 PM   #21
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Two 2-wire cables legal in three-way circuit?


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The way it was commonly done is use one cable as a constant power and neutral, and the other cable as the two travelers.
I don't understand that with the power being supplied at the switch. Don't I just need a neutral and two travelers?

Quote:
I don't see it being a problem if they are ran next to each other as they sound like they are. What you don't want is the two cables taking different paths through the house, which produces an EM field becuase the hot (travellers) and neutral are not ran together.
That's right. Both cables come from the switch box, and run down the wall together (under the same staples, I'd guess). They come into the ceiling of the unfinished basement, where I'd run them into a box and wire a 14-3 to the other switch, and a 14-2 to the load.

Quote:
The part that I don't understand is when you say "use both whites as neutral."
I figure I need the two blacks as the travelers, and one white as the neutral. So I have a second white, which could either be ignored, or joined with the other white. I figured joining them together was better, but maybe not?

Terry
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Old 03-27-2012, 05:50 PM   #22
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Two 2-wire cables legal in three-way circuit?


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I would not because there is a code rule that says hots and neutral must be in the same cable or conduit or raceway. You have split the hot and neutral into two different cables.
I deleted the example because it was a poor example...sorry.

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