Does stranded wire produce more voltage drop than solid wire?

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Solid wire is more efficient than stranded wire when they have the same diameter (circular mil). If the diameter of the wires were identical and one wire was solid and the other was stranded, which do you think would have more copper? Stranded wire has air between the strands, therefore will generate more voltage drop IF THE WIRES ARE IDENTICAL diameter.

This is NOT true when the frequency gets up over 400hz because of the skin effect (current rides on the skin/outer layer - therefore litz/stranded wire is required), but 50 or 60 hertz uses the entire wire to conduct electricity.

The answer is probably that stranded generates more voltage drop, but you can take a length of each cable and measure the actual resistance of both and compare. Whichever has a lower resistance will have less voltage drop.