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Fire pump feeder & disconnect #90710
12/08/04 11:17 AM
12/08/04 11:17 AM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 840
Michigan
Fire pump 20hp & booster pump 3/4 hp.460volt3phase

20hp=27amps LRC=145 amps
3/4 hp=1.6 amps LRC 12.5 amps
Disconnect Size 145 +12.5=157.5
240.6 next size up 175amps
175amp disconnect switch
The way I read it from the fire pump locked rotor sized disconnect switch to fire pump controller wire sized at 125 %
27plus 1.6=28.6x125%=28.6
according to the code 175 amp disconnect switch with 30 amp wire from switch to fire pump controller then to the mtr. code handbook 2002 pages 975-976.
Please comment . Thank u

2017 / 2014 NEC & Related Books and Study Guides
Re: Fire pump feeder & disconnect #90711
12/08/04 07:30 PM
12/08/04 07:30 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Yooper- I see you got it right. You must have had a good teacher [Linked Image]


George Little

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