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The watt meter on three phase system is the same as the one on your house except that it monitors all three phases at once. The meter base is called a 7 jaw base which monitors the three phases and the neutral. The house meter is a 5 jaw meter. The watt meter is a totalizer which keeps track to the watts consumed by the dials on the face of the meter, which gets read monthly by the power supplier.

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15y ago
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15y ago

Single phase formula for you to use kW = I x E x pf/1000. Three phase kW = I x E x 1.73 x pf/1000. pf = power factor. Use .9 for pf and the answer will be close.

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13y ago

You can't. Knowing the FLA and kV allows you to calculate the KVA; to calculate kW, you need the power factor as well.

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6y ago

Watts = volt x amps x 1.73

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Q: How do you figure kw in a three phase system?
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