Oh dear! Their is actually an exception to overload protection Fire Pump! It is NEC 2017 Section 695.6(C) exception no. 2 see below. And guess what it involves onsite generators! Just my luck!
Generator FLA feeding fire pump plus all three branches life safety, optional standby and standby is 481A. Fire pump FLA is 124A. So then that exceeds 225% as stated in exception no. 2 below.
I dont quite get it. Is it saying I dont need overcurrent protection at all? Does it apply to generator feeder breaker? Also the last sentence protection shall be provided shall be in accordance with the shirt circuit current rating of the combination fire pump transfer switch controller or separately derived mounted transfer switch what does that mean?
Anyone please please help
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