The PUD is recomending a 400 amp service for the house I'm building. Actually it is a 600 amp service with a 400 amp disconect for the house and a 200 amp disconect for the future detached garage at the meter pedestal.
I have done the sizing calculations and come up with 129 amps for the house and attached garage. But the PUD engineer says I should have 400 amps because I want to put 240s in the attached garage for welding, compressor and table saw. He is also concerned about the 104 locked rotor amp draw on the geo thermal heat pump and the backup resistance heating that really doesn't show up in the service calculations.
So I am looking at bringing 400 amps to a box in the garage and then splitting to 200 amps. One will go to a 200 amp panel where it enters and the other to a disconect and then to a 200 amp panel in the laundry room. The inspector said I couldn't bring in two 200 amp feeders even if they are switched. I don't see what is gained by splitting them once they get into the garage since there are still two seperate 200 amp disconects. There is a 400 amp disconect at the meter pole. Maybe that is what is important.
The meter and ct can is 60 feet from the service entrande at the garage. If it were less than 15 feet I wouldn't hve to have all these disconects.
Anyway to the question. All of my wiring books only address 200 amp services or 400 amp services with dual feeders. I need to know the wire and conduit size for the feeder wires. The neutral and ground are to be bonded at the meter base so I have to run a neutral and a ground to the meter base with the 2 feeders. The inspector said I can get away with bonding at the disconects in the garage because I got my permit a couple of weeks ago but the code has already changed to bonding at the meter pedestal. I'm going to play it safe and go with the new code.
I read duckdog's post and the recomendation of 400 kcml I assume copper feeders. I think he was planning on using 3 inch conduit. I would also like to use copper feeders. 400 kcmp is going to be hard to pull no matter what size the conduit is.
Thanks in advance