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From: (Yi Jin)

In article ,
HA HA Budys Here wrote:
A 40/40 panel is a circuit breaker box that has spaces for 40 full-sized
circuit breakers.

200a is pretty typical these days, by no means is it for industrial
applications only.

How to determine the size of your panels? I have 2 independent
panels at entrance. The main switches on both marked 200A. Do
I have 200A, or 400A?

Do you have 2 meters as well? If you do you definately have 2 x 200a services.

One of those 200a panels might be fed from the other. The only way a layman can
be sure is to turn off the main in one panel. If 1/2 the place goes off, turn
it back on. Then throw the main in the other panel. If the other 1/2 goes off,
you have 2 x 200 a panels onm a 400a service,

If the entire hoise goes dark, you have a 200a service and 2 200a panels.

Do all amps refer to 240V, or 120V votages?

If the service was installed post mid-'60's, yes you have 240v.