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Version 6.10
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Power Factor

Power factor is defined as the ratio of real power to apparent power. Real power (P) is the capacity of the circuit for performing work in a particular time. Apparent power (Pa) is the product of the current and voltage of the circuit.



The Power Factor Module features the ability to accurately calculate any device's power factor in one of 5 different ways.  Select the method of calculation from the top icon menu bar supporting the known values for the power factor calculation.  Along with the standard Volts controls, the Power Factor Module also has a Post to Main Module button to post the calculated power factor to the main Circuit Load Analysis Module in its appropriate entry box.

The five different methods of power factor computation are:
  • Angle of Phase Offset
  • Oscilloscope Measurement
  • Measured Values
  • Apparent Power
  • Estimate Power Factor

It simply cannot be any easier or more accurate to obtain the correct information the first time.


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Reprinted with permission from NFPA 70 2008, NEC® copyright© 2008, National Fire Protection Association. This is not the complete and official position of the NFPA on the referenced subject which is represented only by the standard in its entirety. The title National Electric Code® and the acronym NEC® are registered trademarks of the National Fire Protection Association (NFPA).

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