k Constant For Voltage Drop
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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