This is a hospital where we are connecting a new unit to an existing
emergency panel. The problem is this EM panel has a rating, and the
breaker of 35,000 AIC, it is fed from transfer switch with (65,000
AIC) and the normal feed to this ATS is an 800 Amp - 30,000 AIC switch
in an old FPE switchboard. The utility transformer fault current is
60,000 AIC. The feeder lengths impedance do not drop the current down
to the 30,000 of the first main. Would there still be FPE breakers
available to replace this 800A-30K with 65K or better?
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