PDA

View Full Version : How does this wiring diagram look to you?


mrpujols
Feb 26, 2009, 01:35 PM
Hi there!

I would love it if I could get another, more experienced, set of eyeballs on the wiring diagram I drew up.

Let me know if I'm missing anything - I appreciate your help. I drew both hots nutted together from the fan/light combo and went from there with the 3 way switch. Look OK?

donf
Feb 26, 2009, 03:09 PM
If your power source is the receptacle on the right side of the image then I believe your drawing is incorrect.

Also, you need to correctly identify the travelers on the 3-way switches.

The switch (S1) to the light appears to be correct in that it is fed by the outlet and neutral is connected to the pigtail on the right.

In looking at the first three way (S2), it appears that you are feeding from a traveler terminal (which would leave both travelers at constant hot) from the receptacle. So the fan light would be on constantly?

You then take red over to the second 3 way (S3) and bring that in on a traveler (constant hot) to both travelers. Also you've run a white to the input of S3 but I'm not sure why if you are already bring the power to the switch with the red conductor.

I need to sketch this one out, but it looks like its wrong to me, but please wait to a qualified electrician takes a look at it.

mrpujols
Feb 26, 2009, 04:29 PM
Ahhhh - labeling the common terminals helped. I also labeled the travelers. Thanks for the pointers. Here are some changes, so please ignore the first diagram (I'll remove it if they let me... )

Stratmando
Feb 26, 2009, 08:43 PM
That will work, identify the white with black tape that is used as a traveller.
Another way, would be in the last box, use the red and black for travellers, as connected in the other 3 way, then the white would be on the last switch common and with black tape at both ends, the other end would connect to the light/fan hot wires.

donf
Feb 27, 2009, 06:33 AM
Strat,

Honest question:

"then the white would be on the last switch common and with black tape at both ends, the other end would connect to the light/fan hot wires."

Forgive me for asking but doesn't NEC limit the use of the white conductor to carrying the voltage away from an ungrounded conductor and to a switch.

Not from a switch to a device?

I'm using a different computer and I unfortunately do not have any links on this one.

Stratmando
Feb 27, 2009, 07:12 AM
mrpujols, 3 ways have 2 travellers, those are the two that don't connect to the common.
I Do Very little Romex, that last white, or any wire on that last 3 way can be switched on or off by the other 3 way, so its not a matter of being a constant hot. Its safe, but may be a code violation. TK, Stan?

Tev
Feb 27, 2009, 10:57 AM
200.7(C)(2) would be the code you are looking for. The white conductor in the cable can be used to feed the switch but isn't allowed to be used from the switch to the switched outlet. It must be permanently re-identified at each termination and each location where the conductor is visible and accessible.

Stratmando
Feb 27, 2009, 01:50 PM
Sorry Tev, Forgot about you, Seems the tape makes it OK?
What is correct to use for the travellers. I do very little romex repair, I have seen it several ways.
Code book is buried, but found this, page 148:
Electrical Wiring Residential: Based ... - Google Book Search (http://books.google.com/books?id=guY8ZA33zlsC&pg=PA148&lpg=PA148&dq=200.7(C)(2)&source=bl&ots=v01YaIH1Ib&sig=imRQTYHDem8dof4Ek3WIDFgLe-Y&hl=en&ei=Y06oSZeWMpjAtgfxq-3oDw&sa=X&oi=book_result&resnum=4&ct=result#PPA148,M1)
Take Care, Thanks

Tev
Feb 27, 2009, 05:06 PM
You can use white as a traveler. You just aren't allowed to use it to bring power from the switch to the switched outlet(I'd like to use the term load here but a switched receptacle isn't a load).

Stratmando
Feb 27, 2009, 07:10 PM
So red and white would be best used as travellers.
Black would be hot or switched. The thing about the 3 way setup is, All 3 are switched, none on that switch is constantly hot.

mrpujols
Feb 27, 2009, 08:49 PM
The definition that I liked, was that the commons were the bridge of electricity from the source to the device. That means the commons either have a black coming from the source, or a black going to the load.
I find that's easier than memorizing the colors of the travelers.