A buddy has a pool panel - it's an integrated box with subpanel and controls for the pool. He just added a new shed and he'd like to run a single 20-amp circuit out to the shed - couple of lights and a convenience receptacle. I didn't have time to read the label but I got to thinking and was wondering if there's any limitations on using the panel for a circuit not related to the pool?

He has access to a Ditch Witch so digging the trench shouldn't be too much of a problem, he's got to go about 100 ft. I'm thinking that dropping Sch. 80 in there might make more sense than running UF. Right now he doesn't anticipate needing more but plans tend to change over time...