The NEC does not require a separate overcurrent protective device or disconnect when a power factor correction capacitor is connected to which point of a single motor circuit installation

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Q11. The NEC does not require a separate overcurrent protective device or disconnect when a power factor correction capacitor is connected to which point of a single motor circuit installation.

**Chapter 11: Power Factor**

**Page 263**

8. We are told that 1 horsepower is equivalent to 746 watts, but a 1-horsepower, 200-volt single-phase motor, according to Table 10-2 (NEC Table 430.248), has a current of 9.2 amperes. Explain this apparent discrepancy.

____________________________________________________________________________________

____________________________________________________________________________________

____________________________________________________________________________________

9. A 240-volt, 3-phase circuit has a current of 116 amperes. A wattmeter connected to the circuit indicates a load of 34.7 kilowatts.

   a. What is the power factor? __________________________________________________

   b. How many capacitive VAR would be needed to correct the power factor to 95%?

____________________________________________________________________________________

____________________________________________________________________________________

10. When a 60-volt, 60-hertz supply is connected to a capacitor, the current reads 0.6 ampere. What is the capacitance of the capacitor?

____________________________________________________________________________________

____________________________________________________________________________________

11. The NEC does not require a separate overcurrent protective device or disconnect when a power factor correction capacitor is connected to which point of a single motor circuit installation?

____________________________________________________________________________________

____________________________________________________________________________________

12. What is the NEC section for sizing conductors to a capacitor and generally what is the NEC minimum required percentage of the rated capacitor current for conductor sizing?

____________________________________________________________________________________

____________________________________________________________________________________

13. What two characteristics of a capacitor are required to be tested to determine if the capacitor is still effective?

____________________________________________________________________________________

____________________________________________________________________________________
Transcribed Image Text:**Chapter 11: Power Factor** **Page 263** 8. We are told that 1 horsepower is equivalent to 746 watts, but a 1-horsepower, 200-volt single-phase motor, according to Table 10-2 (NEC Table 430.248), has a current of 9.2 amperes. Explain this apparent discrepancy. ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ 9. A 240-volt, 3-phase circuit has a current of 116 amperes. A wattmeter connected to the circuit indicates a load of 34.7 kilowatts. a. What is the power factor? __________________________________________________ b. How many capacitive VAR would be needed to correct the power factor to 95%? ____________________________________________________________________________________ ____________________________________________________________________________________ 10. When a 60-volt, 60-hertz supply is connected to a capacitor, the current reads 0.6 ampere. What is the capacitance of the capacitor? ____________________________________________________________________________________ ____________________________________________________________________________________ 11. The NEC does not require a separate overcurrent protective device or disconnect when a power factor correction capacitor is connected to which point of a single motor circuit installation? ____________________________________________________________________________________ ____________________________________________________________________________________ 12. What is the NEC section for sizing conductors to a capacitor and generally what is the NEC minimum required percentage of the rated capacitor current for conductor sizing? ____________________________________________________________________________________ ____________________________________________________________________________________ 13. What two characteristics of a capacitor are required to be tested to determine if the capacitor is still effective? ____________________________________________________________________________________ ____________________________________________________________________________________
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