On Feb 6, 11:33?am, "J.C." wrote:
There is a workshop, an office and an old house, three separate buildings
setting in a somewhat triangular orientation to each other. All three get
their electricity from a single pole with a 100 amp box.

We're building a new house right beside the old one. (the old one will be
torn down)

What I want to do is use the existing line (underground) from the 100 amp
box to the old house and connect it to a 200 amp box for the new house. Can
I do this without having to run a new line? I looked at the incoming line
from the electric company pole. It said AWG 4 but it looked very small. The
line going from the box to the old house is multi wire aluminum (about 160
feet) but I can't read anything to tell what it is. It is about the size of
a penny, circumference wise. Also, can I keep the 100 amp box to supply the
workshop and office and have a new 200 amp in the new house?

Thanks for your time.

--
J.C.

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you spending megabucks on a new home, congrats.

You will need a new 200 amp main service in the new home and feed the
old lines with a breaker sized to the wire to the other now sub
panels, and probably have to upgrade those sub panels too with proper
grounds and new panels.

once you begin changing things upgrading to current code is smart and
may be required by law for excellent safety reasons.

Most likely all the existing stuff is old, time for a overall upgrade
$ well spent!