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"voltage deliver to saw is it simply dividing 1200 by 120"
This is the calculation for Amperage witch is 1200/120=12 Amps
what is the amperage of the saw?
If it is 12 Amp then you will have 5% =6V drop
A #12 wire circuit 300 ft long will have a voltage drop of 19.2 %. This will provide 97V which is unacceptable. At that distance you'll need a #4 copper conductor for a 20A circuit.
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