In Phoenix at least 1/0 AL for 200A and 4/0 AL for 400A from the POCO is normal. We also can't use EUSERC in Phoenix for one reason or another. Seems APS and SRP like to do things differently here. Make sure you get a 400A service specifically for your utility company. They both use different style meter sockets on there 400A services. Wonder how Tucson is since they have a different POCO?
