I’m doing my own underground electrical service entrance on some acreage with a remote meter (200 amp, with disconnect and room for additional breakers) about 20 ft. from the utility’s transformer. From the meter panel I plan to run a 50 amp circuit to a pump house 175 ft away, and direct burial conductors about 350 to 375 ft to a guest house.
(I understand that it’s best to get the transformer as close to the residence as possible but due to topography and setback issues that’s the way it turned out)
My question is will #4urd be big enough to run that distance? And should I use #8 underground wire to the pump house (the well will be about 200 ft deep)?
Replies
For your pump at 175' away according to my calcs you will have about 11.5 voltage drop using #8 & a 7 volt drop if you use #6.
What size panel you plan on installing in your guest house?
400' #4 100 amp = 20.5 voltage drop for copper & 40 volts drop for aluminum.
OOPS that's for AWG not URD lol
Anyways a similar question was asked in another forum--- here take a look I think this will answer your question.
http://www.electricalknowledge.com/forum/archives/452.asp
I wonder if Cindy Sheehan ever thanked her son for her freedom to be a moron.
TO figure the voltage drop you need to know the actual amps.
As mentioned, you haven't stated the load calc for the guest house, which will determine the panel size, which will determine the conductor size.
That being said, 375 feet is a very long way. I went through this with my utility company when installing our service (400 feet from the road). They convinced me that I would face a lifetime of blown refrigerator motors and other problems if I didn't find a way to move the transformer closer to the loads.
Scott.
Always remember those first immortal words that Adam said to Eve, “You’d better stand back, I don’t know how big this thing’s going to get.”
They convinced me that I would face a lifetime of blown refrigerator motors and other problems if I didn't find a way to move the transformer closer to the loads.
I have substantially larger loads 950' from my transformer. No problem, other than paying for the wire. My elec co tried to BS me too.PAHS Designer/Builder- Bury it!