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Fire pump service disconnect #62537
02/17/06 10:03 PM
02/17/06 10:03 PM
Jps1006  Offline OP
Joined: Jan 2004
Posts: 615
Northern IL
If I have a 60HP 3-phase 208 motor with a RLA 140 amps and a LRC of 1000 amps, do I set a 200-amp service using 1000-amp equipment?

Anyone have any experience with these and can describe what your set-up looked like?


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Re: Fire pump service disconnect #62538
02/18/06 11:45 PM
02/18/06 11:45 PM
Tesla  Offline
Joined: Jun 2004
Posts: 1,273
Sacramento, CA
You'll be using 1200 Amp frame equipment.

Go to 695.4 B (1)

Re: Fire pump service disconnect #62539
02/20/06 12:55 PM
02/20/06 12:55 PM
Jps1006  Offline OP
Joined: Jan 2004
Posts: 615
Northern IL
Tesla, why do you say 1200 amp? Do you interpret indefinatly to be continuous load? wouldn't that be no smaller than 1250-amp?

I don't know if it was in the specs or if I am recalling this from another site, but I thought the controller was set to only allow locked rotor current for 20 seconds.

Do you guys normally meter these? I have a meeting set up with the utility for sometime this week, so I'll find out what they want, but I'm curious what some have done in the past.

Re: Fire pump service disconnect #62540
02/23/06 11:07 PM
02/23/06 11:07 PM
Yoopersup  Offline
Joined: Mar 2003
Posts: 840
2002 NEC handbook page 975-976 gives Example and explains it all.


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