Hello. I just recently built a cover over my patio. The next stage of the project is wiring for recessed LED lighting on the underside of the patio cover and a LED flood lamp under the eaves to illuminate the back yard.

Currently there is a single pole switch controlling only the LED flood lamp. The flood lamp is still mounted in its original location. Which is now under the patio cover. I am wanting to remove the 1 gang box in house interior and install an old work 2 gang box to have separate switches for the recessed lighting and flood lamp. The wiring from these switches to the devices is what my question pertains to.

Can I install a weatherproof junction box where the flood lamp currently is, run new romex from switches to said junction box and then from there run romex through conduit until it reaches the patio cover rafters so that it is not exposed on the exterior of the house? I am not understanding if it is okay to use romex inside conduit for this short run(<6ft) or should all this wiring be done using THHN?

Thanks for any help. If I did not provide enough information please let me know.

 

Welcome to the forums.

I think you need to use THWN but let's see what the pros have to say.

 

Thanks for the input. I guess I should note that the only portion of the romex that would be exposed if it was not in conduit would be the run from the junction box to the the rafters. The underside of the rafters will be enclosed hence the recessed lighting.

 

Romex itself is not allowed outside. FWIW, just THHN is hard to find, most will be labeled THHN/THWN.

 

You could use UF-B (gray cable that looks like Romex but is rated for outdoor use), but it's a pain in the ... to strip and even harder to pull through conduit.

If you have conduit in place, I would definitely pull a black/white (and green if PVC conduit) THWN wire. Easy peasy!

 

Oddly stores like Home Depot advertise their wire as THHN which you can't use but if you look at the printing on the wire they actually sell it is usually dual rated THHN/THWN so don't just ask actually look.

 

Pretty soon there will only be one type of wire.... the outer jacket is the same thermoplastic/ nylon coating used over both types of wire.

Thermoplastic High Heat Resistant Nylon is the same outer covering used for THWN.

 

I hadn't heard that. Was there a news release somewhere that I may have missed?