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#45990 - 12/09/04 05:31 PM how to calc power factor?
rather_large_ben Offline
Member

Registered: 10/13/04
Posts: 13
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 06:43 PM Re: how to calc power factor?
RobbieD Offline
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Registered: 02/23/03
Posts: 238
Loc: Canada
On motors look on the talley plate.

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#45992 - 12/09/04 06:47 PM Re: how to calc power factor?
rather_large_ben Offline
Member

Registered: 10/13/04
Posts: 13
so if the nameplate says 1hp, and it says 7 amps at 120V, then 746/840= 89 percent power factor?

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