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Yes, this is what I'm asking. Voltage drops based on the resistivity of the wire it passes through and the total length of run to its destination. In this case, there is 50ft of 6ga (Just double checked) to a sub panel off a 50a breaker.

To the individual that said gauge is determined by the breaker, that is not entirely accurate. You can put the wrong size gauge on a short run breaker and it will work. (you should not, but you CAN).

I'm asking if the recommended gauge rating of a wire is affected if being fed from a sub panel instead of a main panel. The question itself seems straight forward, but admittedly the caclucation to get to the answer seems perplexing.

feeding from a 50a breaker for 50ft rates 8ga wire. BUT if you ad another 50ft to that, assuming the load at the current panel is zero most of the time, does that new load get calculated to include the feeding distance. In this case, 100ft with a 50a breaker in the middle.

I'm guessing common sense says it does, but since it's AC and not DC, technically the electrons aren't actually traveling that total distance, but they are impeded by it, hence the voltage drop calculation. So I'm not sure.

So if no one can answer this, just say so and I'll stop asking. Otherwise, please offer a solution.
Seems like you pretty much know everything, but for your distance I would account for the entire length. Do your voltage drop on the total distance.

Electrons travel at the same rate, whether you excite them with AC or DC potential, so no need to be confused between the 2.
 
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