It's so cord, it's fine for that use as long as it's not gonna be driven over with like a lawn mower

OK, that's nice to know but we'd like to clean things up and do things a bit more squared away ... so it seems like it would be an improvement to put it in some conduit.

However, some additional reading shows me people definitively saying you cannot put SO/SOOW cable in conduit.

So that's the same as ROMEX, correct - you cannot run bundled cables through conduit and this is the same thing ?

I wont speak of code, because I dont know your specifics. That said, I have a similiar situation in a seasonal shack in the north ontario woods. We ran our 10/3 wire about 250 feet inside cheap 1" plastic pipe temporarily about 25 years ago, and its still fine. Gives it an extra layer of protection from treefalls and animal chews. Definitely not code compliant, but safer and neater than many hillbilly hookups I see up there.

You can run Romex in conduit but you have to size appropriately. Your cord is 10ga/3wire so you need to size for that. You could always just bury the cord if that's easier. It has a rubberized coating on it that is fine for that purpose.

Pulling it 500' through conduits would be an absolute bitch but sure you could spend the time and $ doing that.

Sizing guide

https://www.thespruce.com/number-of-electrical-wires-for-conduit-1152860

There's nothing in the code as far as I know stating you CAN'T run Romex or SO in conduit, it's just probably that people assume. "well it fits in this one so it's all good" but you need the airspace for heat if it warms up while being used.

Read some more and found it in the NEC that your not supposed to bury it because it's not rated for abrasion/puncture resistance. And for some reason it's not allowed in conduit except in certain circumstances but it didn't clarify where I was reading.

However, it's your property, your land, your risk. I would personally bury it as long as it's not in an area it'll be damaged. I'd possible you could rent a small trencher and bury it inside an oversized conduit (so it pulls through easily).

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