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Re: Short in lighting circuit affects radio?
"So, even given appropriate wire size for the length of the circuit in both methods, is it more efficient (in terms of voltage drop) to run the same lights on the same circuit"
Well, IF the wire was chosen for the right voltage drop (same drop) it wouldn't make any difference whether they ran two circuits or one. It would be simpler, neater, probably cheaper and just "the right way to do it" to use one circuit. Could be that someone didn't have the right wire, so they ran two runs of lighter gauge wire. That's a perfectly adequate kludge--but still an odd one. Maybe someone said "the bow lights are awful dim, maybe if I run another wire..." who knows.
Sometimes it is just simpler to say "this isn't right, let's do it over from scratch" and move on.