Anthony,

> I plan on running two 15amp or 20amp circuits to the obs (one for scope and
> computers, the other for lights and misc. Distance from the main breaker
> panel back at the house is probably between 350'-500' (haven't measured
> exactly yet - depends on whether I run the wiring through the old barn, or
> around it). Will be buried (probably) or hung (from existing poles around
> the barn) so I know there will be a difference in the type of wire I get,
> but that shouldn't affect the gauge I use (or does it?).

Both strung and buried wire will bring their own unique requirements. Strung
lines would need to have the proper sheathing to withstand the weathering
effects they'd be subjected to. Buried wire would need to be adequately
trenched and marked to keep it below the frostline and avoid accidental
cutting whilst digging - conduit might also be required to meet minimum code
requirements.

Strung wire might be the easier route, if you can arrange the poles at
regular intervals to avoid excess droop in the wire (bad thing) and to keep
it high enough to avoid being snagged by a truck. A proper sub-feed box from
the main panel, housing a main breaker for the feed, routed to a proper
weatherhead is also the preferred route. A small breaker panel in the
outbuilding would also be advised. I imagine that a 20 amp service would be
more than adequate for your needs - I've seen plenty of newer houses that
have three bedrooms running off a single 20 amp circuit.

I would suggest calling either a local electrical contractor or electrical
supply vendor for suggestions on the type and gauge of wire for the intended
application, plus some insights on how to make it meet (or come close to)
local code requirements. Inspectors frown on (and fine for) hackneyed wiring
to other structures.

-Doug

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