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Hints and Tips - How to calculate resistance of a copper cable

Ian B
Ian B has not written a bio yet…


February 15, 2021 15:01

Hi Ian B. Thanks for this tip.
I get slightly different results if I use the resistivity of copper of 0.0172Ω.mm²/m. If I put in a length of 1000m (1km) and then rearrange stuff, I get a factor of 17.2 rather than your 19.
However, looking up some reference tables of CSA vs resistance of 1km, I see that your factor of 19 is closer (see
Could it be that wires are not pure copper and so the resistivity can't be assumed to be 0.0172Ω.mm²/m.
I'd be interested in your thoughts.

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