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A breaker is sized by the load current. A breaker is used to protect the load feeder from an over current being applied to the conductor. If the load draws up to 30 amps, the wire size needs to be a #10 copper conductor or larger depending on the distance to the load with an insulation rating of 90 degrees C. The 460 volt source has to do with the insulation rating of the conductor. In this case the #10 conductor will need an insulation rating of 600 volts. Do not use 300 volt rated wire.

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9y ago
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12y ago

The rule of thumb is, 1mm sq will carry 6A, so for 30A use a 6mm sq cable

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Q: What wire size for 3 phase 460 volt 30 amps?
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