electrical advice

I just ran a 30 amp circuit to an RV box. We ran 6 gauge NM-B 75 ft through the attic to a plastic box in the attic and connected to thhn/thwn and ran through 1 inch pvc 18 inches under ground to the box 75 ft away. Total of 138 feet plus rv cord. Voltage is good and always above 117 v. I dont run the AC and Micro together but it will do it without popping the breaker.

The THHN at Home Depot is dual rated as THWN , it is needed for wet locations. Even though it is in electrical pvc it is still considered damp wet.

By code pvc has a percentage of "fill" rating. They dont want the pvc stuffed full because of temp ratings etc. So one thing you need to do is talk to an electrician etc to be sure your fill isn't over with whatever you end up with.

You also cant run romex in pvc
Right now it's at 117 volts/19 amps. The MN-B that we ran through the attic is also rated at 90 c or about 197 degrees. Three strands of 6 thwn had a lot of room left in the pvc but it is what the charts suggested. This panel is on the exterior of the house so I ran a 2 inch pvc stub out the top of the panel into an LB and then horizontal into the attic. That 2 in pvc has one 10 g, one 14 g, three 12g and one 6 g romex and it's probably about 1/2 full give or take. So I'd say that you can get X amount of conductors through X size of pvc but it may not be code. They want extra room in the pvc which you most likely have.


You cant run romex in PVC.

Be sure to use wet rated wire if this conduit is outdoors or underground.

Sorry I didn't make myself more clear. The reason for the 1 1/2 conduit is that I already have it. I am running 150' of 10/2 (already have it). Just wanted to know if it was ok to add another 10/2 roll in the same conduit. Thanks. Like I said, I'm a little out of my element here.

I lived in a cheap shack that had the home-builder run 10-gauge wire from the service drop a 140' distant. Get ready for a 1,600 watt load with 108 volt value.

8-gauge would service 25 amps

Do they need to be dedicated circuits? I would be running 4 wire 240/120 service the whole way. Sub panel in the middle to split off the two connections.
Only question is how many amps.

Ditto. With the proper wire sizes, you may be able to simply run 4-wire 240/120 for 80 feet then feed the “#10” circuit from a subpanel.

Generally speaking though, the conduit doesn’t care and you can run multiple circuits in it so long as they have “different characteristics” according to replys quoting NEC code on this site: https://diy.stackexchange.com/questions/104094/multiple-circuits-in-the-same-conduit-to-outbuildings

120 vs 240 is certainly a different characteristic.

If your asking if 120v and 240v AC can be in the came conduit the answer is yes. If your asking about conduit fill I don't know because you don't say what size wires you will be running for the 240v circuit. If everything is in #10 wire you would have 5 conductors: 3 hots, 1 neutral, 1 ground then yes, that would easily fit in 3/4" conduit.
Really need more information. I'm doing a lot of "reading between the lines" and guessing.

I'd say its better to explain exactly what you want to accomplish? 1 1/2" conduit is huge and expensive and the voltage you want to run has little to do with the amps you want to run? #10 wire can carry 220 volts as long as you have the required number of wires, as in 4(red, black, white, green or hot, hot, neutral and ground). I'm sure you will get plenty of answers but start by telling everyone what you goal is?