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- Nov 29, 2009
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- 7,268
I bought some nice 12 guage extension cords which are rated at 15 amp and 1875 watts. They are 100 feet long and run 15 amps great and I don't feel the cords getting warm at all. Except I used a voltage drop chart to calculate voltage drop and it drops 4.76 volts which is 3.96% Why do they rate the cords at 15 amps if the voltage drop is so much? Or is this fine? I thought you're supposed to stay under 3 percent? This doesn't make sense since 12 gauge wire is good for 20 amps. I got 100 foot cords cause I'd rather have too long a cord than too short. I run power tools off these cords like table saws, miter saws etc. The tools run good as far as I can tell
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