695.4(B)(1) & 695.6(C)

[ddetter]

Fire Pump - if the overcurrent protection is sized for locked rotor amps, are the conductors to the fire pump sized for LRA or can they be sized only for RLA?

 

[infinity]

Re: 695.4(B)(1) & 695.6(C)

695.4(B)(1) Overcurrent Device Selection. The overcurrent protective device(s) shall be selected or set to carry indefinitely the sum of the locked-rotor current of the fire pump motor(s) and the pressure maintenance pump motor(s) and the full-load current of the associated fire pump accessory equipment when connected to this power supply. The requirement to carry the locked-rotor currents indefinitely shall not apply to conductors or devices other than overcurrent devices in the fire pump motor circuit(s)

695.6(C) Conductor Size.
(1) Fire Pump Motors and Other Equipment. Conductors supplying a fire pump motor(s), pressure maintenance pumps, and associated fire pump accessory equipment shall have a rating not less than 125 percent of the sum of the fire pump motor(s) and pressure maintenance motor(s) full-load current(s), and 100 percent of the associated fire pump accessory equipment.

The conductor size is based on 125% of the sum of the FLC of the fire pump motor and the jockey pump motor plus the additional loads provided by accessory equipment. For fire pump motors only conductors shall comply with the minimum ampacity listed in 430.22.

695.6(C)(2) Fire Pump Motors Only. Conductors supplying only a fire pump motor shall have a minimum ampacity in accordance with 430.22 and shall comply with the voltage drop requirements in 695.7.

Trevor

 

[infinity]

Re: 695.4(B)(1) & 695.6(C)

Deleted: posted in wrong topic.

[ February 15, 2006, 08:26 PM: Message edited by: infinity ]