Re: wire size for long feed to house
Goldcoast,
If you know the approximate sq. footage of the house, I would calculate the minimum service based on Article 220, then bump it up maybe 15-20% and calculate the feeder sizes for voltage drop based on that. If you have no idea on the size of the house, then I would assume maybe 75% or 80% of the service size, then do a voltage drop calc based on this number. It will still be more than the min. req'd by code, while not major overkill. I will tell you at 700' of 75C cable in PVC conduit, to stay under 5% drop using the second method, you could use 350KCMIL for the 200A service and for the 125A service, 4/0 would work.
[ December 17, 2004, 02:06 PM: Message edited by: derekh ]