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If you are supplying power to a 100 amp cont. load then 100 x 125% = 125 amp

A #3 wire with an insulation factor of 75 and 90 degrees C is rated at 100 and 105 amps respectively.

A #1 wire with an insulation factor of 75 and 90 degrees C is rated at 130 and 140 amps respectively.

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