As to new service feed -- doesn't the POCO make an inspection before any upgrade to determine if the feed can handle it?
Do the words "if it ain't broke don't fix it" answer that.
I worked in the Boston, Charlestown Brookline area during the eighties and did a lot of services 400 to 1000 amp and I can not think of many times the power company changed their feeder. Obviously these services must not draw what they are rated at, but if it was a full remodel we would usually change the heating to electric baseboard so the load went up.
Things may be different now.
Bob
