Fire pump

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rozana81

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[FONT=Arial, Helvetica, sans-serif]The client have a 600V (Canadian voltage) fire pump which they would like to use in US. I wonder if we can use a 480V-600V step up transformer between the service transformer and the fire pump. Is it permissible?[/FONT]
 
rozanashaji said:
[FONT=Arial, Helvetica, sans-serif]The client have a 600V (Canadian voltage) fire pump which they would like to use in US. I wonder if we can use a 480V-600V step up transformer between the service transformer and the fire pump. Is it permissible?[/FONT]
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Is the fire pump listed by UL or another US-recognized NRTL? If not, the AHJ may not let you install it.
 
Even if so, I'm thinking that said transformer would be required to be capable of delivering LOCKED ROTOR CURRENT indefinitely, meaning it will have to be 6x larger than normal. It would probably be cheaper to replace the motor.
 
695.5 Transformers. Where the service or system voltage is
different from the utilization voltage of the fire pump motor,
transformer(s) protected by disconnecting means and overcurrent
protective devices shall be permitted to be installed
between the system supply and the fire pump controller in
accordance with 695.5(A) and (B), or with (C). Only transformers
covered in 695.5(C) shall be permitted to supply loads
not directly associated with the fire pump system.


(A) Size. Where a transformer supplies an electric motor
driven fire pump, it shall be rated at a minimum of 125 percent
of the sum of the fire pump motor(s) and pressure maintenance
pump(s) motor loads, and 100 percent of the associated
fire pump accessory equipment supplied by the transformer.
 
rozanashaji said:
The client have a 600V (Canadian voltage) fire pump which they would like to use in US. I wonder if we can use a 480V-600V step up transformer between the service transformer and the fire pump. Is it permissible?
Click to expand...

I think you could as long as it has US NRTL listing but I wonder about the economics of doing so. You will of course need a 600 volt fire pump controller to match it and a transformer. If this is an application that needs a generator as second source then the economics get even worse real quick.
 
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