I have a contractor installing a 208 Volt fire pump in a former hospital that is being converted to 75 senior residential units in a 5 story building. The pump is rated at 500 amps of locked rotor current along with a 3hp jockey pump. The pump will be fused at 600 amps ahead of the main, fed from the utility in a seperate enclosure.
The plans are calling for (3) #1 MI conductors with a #6 ground. What I am looking at in the 2002 handbook in 695.3 is that if you only use one power source, in this case the incoming utility service, "That source must be capable of supplying locked rotor current to the fire pump and accessory equipment indefinitely."
My question is "Do the conductors to the fire pump need to be increased to carry the almost 575 amps LRC of the pump and all associated fire pump accessories"?
Thanks,
Fran
The plans are calling for (3) #1 MI conductors with a #6 ground. What I am looking at in the 2002 handbook in 695.3 is that if you only use one power source, in this case the incoming utility service, "That source must be capable of supplying locked rotor current to the fire pump and accessory equipment indefinitely."
My question is "Do the conductors to the fire pump need to be increased to carry the almost 575 amps LRC of the pump and all associated fire pump accessories"?
Thanks,
Fran