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load calculations #70387
10/05/06 04:51 PM
10/05/06 04:51 PM
doninphx  Offline OP
Junior Member
Joined: Sep 2006
Posts: 6
phoenix , az USA
I was woundering if any one had a quick way to calculate a sub panel load. 3 ph 208.

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Re: load calculations #70388
10/05/06 06:05 PM
10/05/06 06:05 PM
ShockMe77  Offline
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
What are the loads going to be?

Air conditioning, welders, lighting, etc....

Re: load calculations #70389
10/06/06 07:37 AM
10/06/06 07:37 AM
doninphx  Offline OP
Junior Member
Joined: Sep 2006
Posts: 6
phoenix , az USA
the loads are small conveyors, fractional HP motors 120 v single phase and a computer with a 60 watt light at each station.

Re: load calculations #70390
10/06/06 02:26 PM
10/06/06 02:26 PM
Almost Fried  Offline
Joined: Sep 2006
Posts: 98
Madison County, Ark. USA
Don in Phoenix:
There ain't any easy way, ya gotta do the math. Get a pencil out, list every load, in that application I would assume 100% duty cycle. Ask the customer what he plans on ading over the next couple of years, total it up, add 25% and then round up to the next larger size panelboard. Convenience outlets with no load are calculated at 180 vA. Or you can just fake it with a 225 A MLO 42 circuit, NQOD bolt on box, fed with copper enough to overcome the distance, then they will say nice things about you long after you're gone...

[This message has been edited by Almost Fried (edited 10-06-2006).]


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