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What gauge wire for 75 amp?

Updated: 8/11/2023
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14y ago

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Either #6AWG copper of #4 AWG aluminum wire rated for 90 c.

These values are rated at exactly 75 amps so you still need to calculate for voltage drop, conduit fill, and ambient temperature. So as a basic rule of thumb I always step up one wire size(#4awg copper and #3 aluminum) just to be safe.

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14y ago
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7y ago

It depend on what the load is. If it is a motor load then the size of the conductor has to be increased by 125% of the motor's full load amperage.

A #6 copper conductor with an insulation rating of 90 degrees C is rated at 75 amps. If the insulation factor is 70 degrees C then the conductor size is increased to a #4 conductor. If the insulation factor is 60 degrees C then the conductor size is increased to a #3 conductor.

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11y ago

Could use #4 Copper or #3 Aluminum, not taking voltage drop into consideration. You won't have to take voltage drop into the equation, unless your wire run is over 90 or 100 feet.

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7y ago

AWG # 4 copper unless you have a run over 100 feet.

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13y ago

14 for 110 volt and 12 for 220 volt

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10y ago

AWG # 6 copper.

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