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30 gauge wire is much "thinner" than 10 gauge wire. Hence, if you are using 10 gauge for an application requiring only 30 gauge, it will more than handle any current flow. However, if the application requires 10 gauge wire you cannot use 30 gauge wire.

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12y ago
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14y ago

Yes, but the circuit amperage loading has to be equal to the amperage capacity of the smallest wire which is the #20.

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Q: Can you splice a 10 ga wire to a 20 ga wire?
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