What type wire to use from transfer switch to outdoor outlet

brjlDecember 1, 2009

I have installed a Connecticut Electric transfer switch for my generator (7500 watt) to my breaker panel and now I want to run wire from the switch 60 feet inside the house and hook up to an outlet (30 amp) that will be attached to an exterier wall of the house. I have purchase a rain tight outlet box, the only thing I need to do is run the wire into the back of it from the basement.

The question is, I purchased 10/3 NM-B with ground wire, the wire has a white, black, red, and un-cased ground. Would this be the correct wire to use? I had the impression that I needed 10/4 wire, with the ground wire cased,(green) but the Home Depot person stated that since this is an interior installation, that the 10/3 is what I need. Is the 10/3 wire correct? The transfer swich has a red, black, white and green wire to hook to.

Thanks for any help.

Thank you for reporting this comment. Undo

That is exactly what you need, you're good to go.

Be sure to seal the back of the box to the house very well. Some people will argue that the back of that box is considered "outside" and romex shouldn't be used there lol.

    Bookmark   December 1, 2009 at 6:22PM
Thank you for reporting this comment. Undo

Are you really intending to backfeed an OUTLET, or do you actually have a proper inlet for your application?

    Bookmark   December 1, 2009 at 6:37PM
Thank you for reporting this comment. Undo

Sorry, I believe the box on the outside of the house is an inlet.

Anyway, thanks very much for the information, great site.


    Bookmark   December 2, 2009 at 7:50AM
Thank you for reporting this comment. Undo
Ron Natalie

There's no prohibition on NM (Romex) being used outside. Perhaps you mean "wet locations".

    Bookmark   December 2, 2009 at 8:12AM
Thank you for reporting this comment. Undo

Seal the exterior box around the top and sides to the wall and you no longer have a wet location.

Leave the bottom joint open for condensation escape.

    Bookmark   December 2, 2009 at 2:17PM
Sign Up to comment
More Discussions
Please Critique Low-Volt (Home Automation) Plan/Proposal
GW/Houzz Community, As always, I want to thank this...
Andrew K.
Two fans on same circuit in different rooms, can't get wiring right
So here's the situation. I have two ceiling fan/lights...
Confused & need help please
I know just about zero when it comes to electricity....
Electrical Problem.
My mom's house has a problem with the lights temporarily...
Debra Johnson
Goodbye Phone Jack: what to do with wires?
We want to remove this phone jack. It's in a useless...
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™