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"maxinemovies" email on wrote in message

Our contractor says, nope, the house is 100 amp and so he put a 100
amp pedestal next to the house for Edison to hook up to. He says
maybe we ordered 200 amp service, but we didn't get it and we should
ask for our money back on that.

The "house" is not 100 or 200 or any amps. that is determined by the
capacity of the main wires coming in and the braker box in the house.

How do we tell if we have 100 or 200 amp service? My husband has
looked at the circuit breaker box on the back of the house and he says
there's one larger switch at the top that is labeled 100, then all the
smaller switches underneath it.

With a main breaker of 100A, the most you will be able to draw is 100A.
Was the box put in by your electricain or the home builder? What size wire
is feeding the panel? Could be the right panel, the right wiring, wrong
breaker. I can't see anything so I don't know for sure.

What happens if Edison puts 200 amp service on that 100 amp pedestal,
and what if we do have a 100 amp house?

Northing. It will only draw a maximum of 100A due to the 100A breaker.

Or what if we tell Edison to only put 100 amp service on, but the
house actually turns out to be 200 amp?

You will be limited to the 100A unless you get (or have) a proper box and
wiring.