Posted by John T on August 27, 2011 at 06:22:08 from (63.252.228.254):
In Reply to: OT wire question posted by DanR on August 27, 2011 at 05:18:00:
Of course direct bury UF is easy, just dig a trench n bury the cable. HOWEVER I'm like Mark, if you bury conduit then snake the cable (USE or THWN, I forget????) through youre better protected and can upgrade sooooooo much easier. I wouldnt run any less then 100 amps of service (No 1 copper should allow for voltage drop) or at least use big enought conduit and wire so that much could be supplied if and when needeed. Id use rigid conduit risers where the underground conduit rises up above the ground (or under driveways) and LB's into your building.
For 120/240 volt single phase 3 wire serive, run 2 Hots (L1 & L2),,,,,1 Neutral (a GrounDED conductor),,,,,,,1 Equipment GroundING conductor) and at the remote buildings panel DO NOTTTTTTTTTTT bond the Neutral and Equipment Ground Busses together (keep isolated i.e. need a panel that allows for such) like is done at the main service entrance. Of course each buildings service still requires adequate earth grounding such as made grounding electrodes like driven copper rod or rods or metallic water pipe etc etc.
Its not that bad of a job to bury plastic pipe and the wire wont be much more expensvive then Underground Feeder UF and with 100 amp rated conductors or bigger to allow for voltage drop (if youre not going over 100) then youre set for life
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