This is my first post so let me give you my background real quick- about 8 years experience, mostly commercial. got my license last year and started doing my own thing. so whats new to me is doing calculations, designing installs etc.
I have a potential customer who has a farm, right now there is no electric whatsoever so the poco needs to drop poles or design something else to get elec out to the property. The closest pole is across the street and about 500 feet away from where the customer plans on putting his barn. Right now the customer just needs electric for his well pump, but in the near future he will be putting up a barn, greenhouse, as well as the lighting, receptacles and appliances that come along with that. In the distant future he may build a house on the property (lands approved for it, but its another 500-1000 feet from where the barn will be, so a total of about 1000-1500 feet from the road.
I have already contacted the poco, they need a few things from the customer, as well as load calculations from me to make sure if they run power out there they are only doing it once. Being that everything will be in the future i have no plans to go off of, so off the top of my head i was just figuring a 400 amp main, than come out of that and feed a 200 amp panel for the house (when its built), and than a 200 amp panel for the farm. I also wanted to have a disconnect for each 200 amp panel near the 400 amp main to de-energize the house, or farm if something needs to be worked on.
For my calculations i was just going to base everything off a 2500 sq ft house (customer doubts it would even be that large), all elec appliances, plus the current greenhouse, welder and farm equipment he has on his other farm. The calculations i came out with were a total load of 65,225 watts. That divided by the power coming in 240 would give me 272 amps. Which i think a 400 amp service would be fine, a little overkill but i don't know exactly the house or barn will draw.
Providing i go with 400 amp service correct me if I'm wrong, but it would be 400kcmil copper in a 3" conduit, or 600kcmil aluminum. in a 3-1/2" conduit. Would you guys typically derate the neutral for that? Also, if I'm coming into the 400 amp main in the middle of a field, the only ground required at that location would be a #4 to ground rods? Than normal grounding for a 200 amp service at the house and barn?
Another question i have is- Is there a general lighting load requirement for a barn? technically its a commercial farm, not to the public though. i don't see anything in table 220.12 for that..
Sorry for the long post but i was trying to be as detailed as possible. Is this how you guys would design this? Please give me any answers or recommendations you may have, any input is appreciated as long as its not negative.
I have a potential customer who has a farm, right now there is no electric whatsoever so the poco needs to drop poles or design something else to get elec out to the property. The closest pole is across the street and about 500 feet away from where the customer plans on putting his barn. Right now the customer just needs electric for his well pump, but in the near future he will be putting up a barn, greenhouse, as well as the lighting, receptacles and appliances that come along with that. In the distant future he may build a house on the property (lands approved for it, but its another 500-1000 feet from where the barn will be, so a total of about 1000-1500 feet from the road.
I have already contacted the poco, they need a few things from the customer, as well as load calculations from me to make sure if they run power out there they are only doing it once. Being that everything will be in the future i have no plans to go off of, so off the top of my head i was just figuring a 400 amp main, than come out of that and feed a 200 amp panel for the house (when its built), and than a 200 amp panel for the farm. I also wanted to have a disconnect for each 200 amp panel near the 400 amp main to de-energize the house, or farm if something needs to be worked on.
For my calculations i was just going to base everything off a 2500 sq ft house (customer doubts it would even be that large), all elec appliances, plus the current greenhouse, welder and farm equipment he has on his other farm. The calculations i came out with were a total load of 65,225 watts. That divided by the power coming in 240 would give me 272 amps. Which i think a 400 amp service would be fine, a little overkill but i don't know exactly the house or barn will draw.
Providing i go with 400 amp service correct me if I'm wrong, but it would be 400kcmil copper in a 3" conduit, or 600kcmil aluminum. in a 3-1/2" conduit. Would you guys typically derate the neutral for that? Also, if I'm coming into the 400 amp main in the middle of a field, the only ground required at that location would be a #4 to ground rods? Than normal grounding for a 200 amp service at the house and barn?
Another question i have is- Is there a general lighting load requirement for a barn? technically its a commercial farm, not to the public though. i don't see anything in table 220.12 for that..
Sorry for the long post but i was trying to be as detailed as possible. Is this how you guys would design this? Please give me any answers or recommendations you may have, any input is appreciated as long as its not negative.