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how to calc power factor?
#45990 12/09/04 09:31 PM
Joined: Oct 2004
Posts: 18
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rather_large_ben Offline OP
Member
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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Re: how to calc power factor?
#45991 12/09/04 10:43 PM
Joined: Feb 2003
Posts: 231
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RobbieD Offline
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On motors look on the talley plate.
Re: how to calc power factor?
#45992 12/09/04 10:47 PM
Joined: Oct 2004
Posts: 18
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rather_large_ben Offline OP
Member
so if the nameplate says 1hp, and it says 7 amps at 120V, then 746/840= 89 percent power factor?

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