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For that current you would need five 0000 (4/0) wires in parallel for each side of the circuit, and they would heat to 90 degrees C if used for any length of time according to the NEC tables. Those wires have a diameter of 0.46 inch exactly.

There are better ways of transmitting 153 kW if there is a higher voltage available.

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10y ago
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3mo ago

To determine the wire size needed for 120VDC and 1275 Amps, you would use the formula: Wire size (AWG) = (Ampacity of wire)/(Current carrying capacity of wire). In this case, with 1275 Amps and 120VDC, the calculated wire size required is approximately 300 MCM (thousands of circular mils) which corresponds to a wire gauge of 250.

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Q: What size wire is needed for 120VDC 1275 Amps?
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