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#45990 - 12/09/04 09:31 PM how to calc power factor?  
rather_large_ben  Offline
Member
Joined: Oct 2004
Posts: 18
How do engineers calculate power factor on a ckt before anything is hooked up? Are motors all similar 80 percent-ish and they just estimate, or can they calculate it exactly.
The power company wants load calcs including power factor. Thanks, Ben


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#45991 - 12/09/04 10:43 PM Re: how to calc power factor?  
RobbieD  Offline
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Joined: Feb 2003
Posts: 231
Canada
On motors look on the talley plate.


#45992 - 12/09/04 10:47 PM Re: how to calc power factor?  
rather_large_ben  Offline
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Joined: Oct 2004
Posts: 18
so if the nameplate says 1hp, and it says 7 amps at 120V, then 746/840= 89 percent power factor?



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