Fire Pump - Utility Provided Service

[AHE Tom]

It appears that NEC 695.5 covers a situation when the "system voltage" (incoming utility voltage), is different than the "utilization voltage" (fire pump voltage), thus needing a xfmr., is this correct ?

If the incoming utility voltage is the same as the fire pump voltage, then I think section 695.5 does not apply, correct ?

The intended design is to provide service to the fire pump controller directly from the utility company CT enclosure mounted on the exterior of the building.
As for sizing the conductors, they should be based on section 695.6 (A) for the conductors from the CT cabinet to the controller, and 695.6 (C) for the conductors from the controller to the pump, am I correct here ?


Thanks
Tom

 

[radiopet]

Yes, the intent is that it "Shall Be Permitted" as long as the requirements are met. If the system voltage coming in matches the fire pump set up then you size as you would normally.

It is important to meet all the requirements of 695.5..regarding (A), (B) and(C). The key here is maintaining proper overcurrent protection is selected to meet the LRC requirements for the Fire Pump motor and associated equipment ( ie: jockey pumps ).

Atleast thats the way I read it.

Also remember the ability to handle the LRC does not apply to the conductors or other devices other than overcurrent protection in the pump circuit.