POCO vs. NEC
I bid a service swap recently for upgrading from two 100 A services to two 200 A services on 4 duplex units. The customer didn't want to use a meter pack, for some reason. Anyway, I figured the service like a 400 A, and used the smallest service entrance conductors allowable by the NEC, 400 kcmil copper, with 2/0 copper to each meter socket from a trough overhead.
I got the job, built one service and had it inspected. Today the POCO guy comes out and sweats and wrestles and curses the "Big Ol' Wire" we had coming from the riser. I said "sorry buddy, that's the smallest wire we could get away with." He asked why that was, and I said the NEC says so.
He told me that they (the POCO) allow that kind of service to be fed with 4/0 copper. Of course, that would save me a bundle on the other three services, but the NEC says I have to use 400 kcmil minimum. So what would you guys do, use the POCO spec, or the NEC?