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When I was an apprentice my employer always told me you can only use stranded wire in conduit. I was curious of this so I checked the NEC and you can use either. I would recommend using stranded...

Do not use romex (nm cable) in any form of conduit. The hazard is not overheating, but that it isn't flexible enough. Wires for conduit must be stranded for more flexibility. There are usually bends...