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#4801 - 10/18/01 12:02 PM 3- 15kw heating units  
andy19  Offline
Junior Member
Joined: Oct 2001
Posts: 1
fort worth, texas
I HAVE A 200 AMP 120/240V 1PHASE M/L/O LOAD CENTER PANEL IN A MODULAR SCHOOL BUILDING
THAT THE MANUFACTURER INSTALLED 3 -15KW 240V
1 PHASE IN. TOTAL LOAD OF 198 AMPS WITH BLOWER MOTORS. I'M PLANNING ON FEEDING THIS SUB PANEL WITH A 200 AMP FUSE DISCONNECT. anything IN THE NEC THAT SAYS I CAN'T DO THIS? I'VE ASKED SERVERAL PEOPLE AND THEY SAID I COULDN'T BUT COULDN'T GIVE ME A CODE REFERENCE.
THANKS FOR YOUR HELP
ANDY

[This message has been edited by andy19 (edited 10-18-2001).]


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#4802 - 10/19/01 08:40 PM Re: 3- 15kw heating units  
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
Andy,

The best I can say is "maybe."

See 220-15, the exception seems to offer some wiggle room. If all units will be on at the same time, what about the lights & receptacle load, are they on another feeder? Seems to me that there is not enough capacity. To apply the exception, you'll need permission from the AHJ.

Tom


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#4803 - 10/20/01 03:08 PM Re: 3- 15kw heating units  
bordew  Offline
Member
Joined: Aug 2001
Posts: 142
Vienna,Ohio, USA
Andy:
Wouldnt this be considered a continuous load?
210.20(A). So if your load is 198 amps with that kind of load the conductors could also be used as heaters (?)
Just by that the rating should be 247 amps or 125% of the load + the non-continuous load. Also art. 424.3(B) Branch circuits, fixed electric space heating equipment, shall be rated at 125 % of total load and motors.
I would think you need a bigger panel.


#4804 - 10/20/01 09:10 PM Re: 3- 15kw heating units  
electure  Offline


Member
Joined: Dec 2000
Posts: 4,260
Fullerton, CA USA
I think I'd contact whoever it was that supplied this piece of "art", and have them give you something that is Code compliant.
If it's going in a school, the school district should at least have enough clout to get something safe from them.



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