Sure you can have 240v and 120v in the same conduit.

What you should have done though is run individual conductors in the conduit, NOT cables.

More importantly he needs to make sure any conductors in the conduit are rated for wet areas.

Trying to fish another 12-2 through a 1" conduit with two already in it is going to me near impossible physically.

I did purchase the direct burial wire from Lowes, but figuring I'd try to add extra protection from shovels, etc, I put them in the 1" conduit. You're also correct, there is no way I can get another one in there. I had to pull like crazy to get both of them through. Thanks. My biggest concern was I thought somewhere I had read that 220/240 and 110/120 gave off some stray voltage. It must have been something else however, and I just got it confused. Since I did use the direct burial, maybe I'll get maybe just a little more protection though.

"Since I did use the direct burial, maybe I'll get maybe just a little more protection though."

The only thing you have is some extra insulation further limiting the ability of the actual wires to dissipate heat.

There is no issue with one power wire near another of the same system (all your wiring is on the same system). The issues would apply to running phone, cable TV, CAT5, etc., in there with the power. Power wires can have some magnetic fields close to them, but they won't have any impact on other power wires.

Yeah, 1" is a bit small for 2 cables.

He might have been able to pull them if he'd done them all at the same time, but now it's going to be impossible.

The other issue with running phone/tv/networking/thermostat etc through the same conduit is the insulation ratings.

This is a homeowner project. Next time, (doubtful) I do an outdoor kitchen I'll run two or maybe even three 1.5" conduits. But learning curves as they are, I'm now stuck with what I have, and I'm not pulling up pavers. The run is this: straight down for at least 18", taking a 90 degree turn and going straight out for 8 feet, taking another 90 degree turn and running 7 feet, and then turning up into the base of the kitchen. Not a long run, three 90 degree turns, and yes I pulled them at the same time with a tape. It was a hard pull but not all that hard, but I do know and understand that there is no possibility of any additional lines going into this conduit. If I ever want cable TV, I'll have to come up with some other plans. Maybe what I was thinking about when I started this thread were the other types of wire like TV, Phone, etc. that skapare mentioned. You guys have relieved my anxiety though that the lines I have in there can coexist in the conduit and that was my primary concern. Thanks to all.

You might be able to do it if you pull out the UF and fish in individual conductors all at the same time.