i have a study guide with a question i do not understand.

question: what is the total resisitance in a 2-wire circuit, 30 feet in length, utilizing NO. 10 AWG THWN?

the equation they say to use is R=KxL/CM; R=10.4x60/10380=.060ohms.

I don't understand were the 10.4 comes from. The question only explains were the leght comes from and the circular mils.

:confused:

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