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Old 04-10-2007, 12:29 AM   #1
 
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Default Anudder service calculation question?

I once wired a 2 story house that had 3 seperate Heat & Air units. The heaters were all gas, so 20amp/120v circuit only to them. But two a/c units required 30 amp/240v circuits and one a/c unit required a 40 amp/240v circuit.

So when calulating the service load would you use only 100 percent of the largest a/c unit, or 100 percent of all 3 a/c units, or 100 percent of average of all 3 added together? Or just how would this be placed in your calculation table for finding the service load?

Thanks for your input. Still studying for that masters/contractors exam!
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Old 04-18-2007, 04:44 PM   #2
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NEC 220.21 ENTER THE LARGER OF THE HEAT AND A/C IN Va. [ A/C- VERSUS -HEAT ] { Va. = APPROXIMATE WATTS }

Also check out 220.30 (C) for the percentages for other than Air-Conditioning and Heat Pump and Supplemental Heating....

Hope this helps....

Also...to make it easy on you....here is a nice download for you from my site

http://www.theelectricalguru.com/dwellingcalc.xls

It has been edited to be based on the 2005 NEC.......ENJOY !
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