Look on the handle end of the main breaker. There should be a number there. That is the amperage of the main breaker. That is the size of your house service.
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sounds like you have a 100 amp service to your home.. that will need to be upgraded to a 200 amp service.. you shouldn't have any problems after upgrade..
A 350 amp service is not a standard service distribution. It jumps from a 200 to a 400 amp rated distribution equipment. The only way to obtain a 350 size service is to install 400 amp equipment and fuse it at 350 amps. The standard size home distributions in North America today are rated at 200 amps. The cost of the service differs through out the continent. Ask your local electrical contractor for an estimate on an electrical upgrade to the required service that you want.
Depends on the size of the service. 100 amp service will require 3 gauge, 150 amp service will require 1/0 gauge, and 200 amp service will require 3/0 gauge.
For Service Entrance Cable 600 kcmill (Thousands of circular mils).
A 200 amp service panel with a 60 amp sub-panel.