kConstant

k Constant For Voltage Drop

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k Constant for Voltage Drop

Time was when 10.4 ohms per circular mil foot was the constant for copper conductors. In an effort to be more accurate for various sizes of conductors, k is now calculated with this formula:

k = R (resistance of the conductor based on size from the NEC) times circular mils
divided by 1000.
(Be sure to use the R for uncoated conductor values since that is what is used for building wire.)

The result is the correct k for a specific conductor.

Here is a sample table of k values as provided in Reference Formulas Appendix

Find practice problems HERE.

Find audio support HERE.

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