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Underground Wiring
I have over 100' of 100A flex line to a 100A service panel that's mounted on plywood. Various receptacles are wired to the panel and also mounted on the plywood. I used it in the sound buz when a stage didn't have adequate AC. Bare ends were on the feed end of the flex line and were 'tied' into a service panel rails with clamps. The flex line had to be adequately protected. That's a fairly inexpensive way to get many 110V and 220V circuits temporary locations for weekend festivals and it would good enough to get passed fire marshals. The 110V receptacles used for on-stage circuits were GFI protected.
Since the sound buz days, I replaced the bare ends of the feed with a 30A 220V plug for my generator. The line and panel is overkill but it's something I already had. I'd check local regs but maybe something like 8-gauge flex line from a drier recpetical into a 30A subpanel (with it's own disconnect and the neutral/ground bond removed) would suit your needs. The flex line isn't exactly cheap though but it might remain useful if a remote work site had to be supported from a generator.
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Underground Wiring
Murf: Sorry I wasn't more clear. The idea of flex line is not to bury it. Just drag the line to the house and plug it into a drier outlet as needed. Some planking might be needed in traffic areas.
That's the way it's done in the sound buz and without contractors or permits. Technically it does take an electrician to tap into the rails of a service sub-panel though, but in this case an existing receptacle would be used. However, the idea should be checked with officials to see if it'd fly in a particular area. It's basically just a heavy-duty extension cord that might have some on-going use. The panel could be used as a sub-panel in the permanent wiring.
Overhead line might even be cheaper. It may also start looking more like a permanent installation and be more subject to code--don't know about that though. What ever is done should be safe and not run afoul of insurance or regs.
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Underground Wiring
A 20A 220V branch circuit off the service panel into 10-3 direct burial (DB) line should work. That way there'd be no unprotected line. I'd probably use 3/4" plastic flex conduit to protect the line going out of the house and into the trench and also into the garage and terminate it into a 20A disconnect.
Two 20A 115V circuits could be wired off the disconnect. 10-gague line would support the circuits plus provide extra gauge for the length and motor start up surges. A shallow temporary trench should still have a fair amount of rock free dirt in the bottom--especially if vehicles might drive over it, and it might be good to leave some slack at each end in sort of a frost loop.
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07-06-2004, 06:30 
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