>>And WHY do WE all use 12G for our mains which are probably less tha eight feet on average?(

It's simple, really. If your cable runs are short, you might as well get 12 ga because the extra cost is trivial, heavy wire that length is easy to handle, and you might need it for part of a longar cable later.

If your cable run is medium, you either need 12 or 14 ga anyways so what the heck... might as well get 12 ga to match the shorter cables.

If your cable run is long, you need 12 ga anyways.


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