




#130101  02/09/06 08:07 PM
Re: Calculations

Member
Registered: 04/30/04
Posts: 349
Loc: Los Angeles, CA

OK  here's my initial cut at this. Start with the 3Ø component  take 240,000 VA (80,000 VA per phase) divided by 240 * SqRt of 3, which comes out to around 578 amps.
Next I'd ignore the ØA load as it just counteracts the ØC load. The ØC load is 41,000  divide that by 120V for another 342 amps (on the C leg).
All in all, 578 + 342 = 920 Amps < highest leg (which is ØC).
Taking 920 amps X 1.25 = 1,150 amps, I'd vote for a 1,200 amp OCP.
Tomorrow at work I'll plug the raw data into a panel schedule and see what it says.
Radar
[This message has been edited by Radar (edited 02092006).]
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#130105  02/10/06 05:14 AM
Re: Calculations

Member
Registered: 12/12/04
Posts: 1091
Loc: nowhere usa


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