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#62537 - 02/17/06 06:03 PM Fire pump service disconnect
Jps1006 Offline
Member

Registered: 01/22/04
Posts: 609
Loc: 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?

Thanks.

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#62538 - 02/18/06 07:45 PM Re: Fire pump service disconnect
Tesla Offline
Member

Registered: 06/16/04
Posts: 1280
Loc: Sacramento, CA
You'll be using 1200 Amp frame equipment.

Go to 695.4 B (1)
_________________________
Tesla

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#62539 - 02/20/06 08:55 AM Re: Fire pump service disconnect
Jps1006 Offline
Member

Registered: 01/22/04
Posts: 609
Loc: 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.

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#62540 - 02/23/06 07:07 PM Re: Fire pump service disconnect
Yoopersup Offline
Member

Registered: 03/04/03
Posts: 826
Loc: Michigan
2002 NEC handbook page 975-976 gives Example and explains it all.

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