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#177988 05/20/08 10:24 PM
Joined: Mar 2008
Posts: 10
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saras Offline OP
New Member
why do we do this, what are the benefits, and does it make troubleshooting down the road more difficult?

In my new job, one of the jm doesn't explain too many things...

there were 2 3-ways in a 2gang. old wiring with the paper... the neutrals were hots, and there was a red from one and a white from the other merretted together loose in the box. Where was the switch leg??


Joined: Mar 2004
Posts: 947
T
twh Offline
Member
It's a white as hot - not a neutral as hot, please. We do it because we don't want to use two kinds of two wire cable and two kinds of three wire cable, one with a white and one without. As it is, I can barely move around in my truck with one kind of each in non-metallic and bx both in several sizes.

There is a specific way to connect the wires, which makes troubleshooting easier.

Perhaps someone can provide a link to a 3 way switch diagram?

Joined: May 2007
Posts: 47
B
Member
In commercial work or resi where the power source for the circuit is at the fixture (vs the switch) the conductors going down to the switch are called (drumroll please) switch legs.

In general, these are the ONLY time you can ordinarily expect to see a white wire used for anything other than (neutral) the ungrounded.

This is one of those "get used to it" things. Sorry about that.
The reason this practice is tolerated is mostly about money.

A good practice is to mark these non ordinary use conductors with some phase tape (some color OTHER than what is elsewise found in that box eg orange or yellow).


Design-Build isn't supposed to mean design *as* you build.
Joined: Jul 2004
Posts: 9,663
Likes: 4
G
Member
You are required to use the white in a cable as the hot on a switch leg if you are using it as an ungrounded conductor and since 2002 or so you are required to reidentify it with tape or other method. 200.7(C)(2)
The thinking is the return from the switch will be a "phase" color when it gets to the luminaire. Then the installer will be presented with a white neutral and a phase color for the ungrounded conductor.
It can get a little confusing when you are on the supply end tho. That is why they started requiring reidentifying the wire.


Greg Fretwell
Joined: Dec 2001
Posts: 2,492
T
Member
That's an interesting practice... in Europe mostly the black/brown wire in the switch leg is used as the permanent hot and the blue as the leg to the fixture. Usually there's a junction box in the middle though where the "hot blue" changes back to black or brown.

Where conduit is used it's good practice to use a different phase color like brown (if the other phases are black), orange or purple for the switched hot. So either the power source is at the switch or at a junction box, due to the lack of ceiling boxes except for cast concrete ceilings we can't really make any connections beyond the fixture splices at the fixture.

It's a good thing to remember - never trust a wire color. Oer at the violation photo board you can see pictures of green hots and everything... always expect to encounter hack work rather than risk your life by trusting someone you don't even know (the guy who installed the old wiring you're working on).

Joined: Mar 2005
Posts: 1,213
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Green hots?? I can see someone cheating with a white or blue, and the occassional use where it's justified, but a green? Man, that just takes all!

Joined: May 2007
Posts: 169
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Joined: Jan 2006
Posts: 558
R
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My Dad taught me this simple rule many many moons ago:

"The neutral is always white, but the white is not always neutral".

A.D

Joined: Dec 2004
Posts: 329
I
Member
Another time you'd use white as a hot is a 240V circuit.
Unless, of course, you want to run 12/3 (unneeded expense)and have an unused white at the load. You would/should have to land the white at the panel though, if you did that. I have seen 6/2 WG that has black and red wires (there is some in my house), but I have never seen it for sale myself. So, I don't know if it is even available anymore.

Joined: Dec 2003
Posts: 751
E
Member
You can get any color combination you desire, if you want to make a special order and wait for delivery.


Earl
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