A contractor grade cord (12ga) will drop a tad over 5 volts 100 feet
out with a 13a load, what a good chain saw might draw.
That is less than the recommended max V/D.
In order to avoid zoning issues at the boat shop I ran everything off
two 100 foot, 12 gauge extension cords. They ran everything I threw at
them including my Table Saw and Radial Arm. I had them each plugged into
dedicated lines from the fuse box. Never noticed any problem with them
and any loss of power at the plug.
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