In article , Pete C. says...

You'll get far more than 100 Amps, even if it was after the breaker. The
breaker won't limit the current, only shut it off when it's over 100
Amps and it's not instant either. Pre breaker it will just max out
whatever it can with the voltage drop from the feeders until something
melts open.

Basically it's limited by the impedance of the source, typically
back to a pole pig in residential service. That's low, but it's
not really low.

Here at work they've been upgrading all the 20 amp breakers in
the turret boxes in the labs to be over 100KA interupt rating.

Basically the 'distance' back to the 13.8KV feeders for the
building is pretty low, from an electrical standpoint.

Jim


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