Your best bet is to talk to the utility company or local electrical
contractors as service work is done completely differently across the
country. For example, in my area, the utility company owns and installs the
drop, and for a residential 400 amp service they may use 1/0 depending upon
calculated load. How have you determined that the 200 amp service is
inadequate?



"SteveB" wrote in message
...
The doofus that built a house I bought had a 200 amp panel put in for an
all electric house. We are at the maximum of what will run off this
panel.

I want to add a casita, and a shop.

So, I need to run a 400 amp service from the pole to a panel that will
feed the casita and shop. Distance from pole to said box is about 150'.

What size cable would I run from the pole to the 400 amp box?

Steve