The only real difference is who will be looked at as 'the bad guy'.
If you size the conductors large enough to prevent voltage drop and the house still has problems the only blame will be the POCO.
If you do not size your conductors for voltage drop you will be the 'bad guy' in the customers mind.
Another thing to consider is that solid 4 AWG is probably running at 13.8 KV the higher the voltage the less problems with voltage drop.
Here is an example
13,800 volts, 50 amp load, 600' 4 AWG AL.
That results in only 0.221% voltage drop
Now change only the voltage to 240.
The voltage drop is now 12.5%!
The POCO usually are required to be within 5% up or down of the service voltage. They can change taps on a transformer if the voltage drop is unacceptable.
Bob
