AVS Forum Special Member
Join Date: Dec 2003
Location: Bethesda, MD USA
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Conceivably, if you wanted to set it up to prevent future screwups like that, you could use a different inlet plug entirely. Like the kind on a boat or RV. And then make (or have made) a patch cord just long enough to go from the back of your UPS to the inlet. This way you'd prevent them from using just any old cord, or your patch to some other outlet, assuming your patch cord is shorter than the distance to the next nearest live outlet.
But honestly stuff like automation, more often than not, usually scares away buyers. They'd be more likely to rip it out rather than use it, let alone mis-use it.
For your setup you're looking at putting only two outlets off it; one inside the box and another way up on a shelf. Even if they did something stupid like used a lamp extension cord to bridge the connection there's still only going to to be whatever's in the box and on the shelf connected to it. If they're willing to then plug more stuff into those, well, they'd already be well-past the limits of reasonable assumptions and on their way to the Darwin Awards. That you used 20A plugs/sockets ain't gonna matter much at that point...
Me, I'd put a label on the inlet clearly stating it's for connection to the UPS only and NOT to a wall outlet, and leave it at that. Maybe find a way to put a permanent diagram explaining the circuit. Laminated onto the box cover, or inside a picture frame hard-mounted (not just hung on a hook) to the nearby wall.