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What size wire do I need for a 60 amp subpanel?

4-gauge wire is what it would be. It's common to wire 60-amp breakers with 6-gauge, 3-conductor wire because an appliance that needs a 60-amp breaker rarely draws the full 60amp. It's a good idea to connect the 60-amp subpanel to the main panel with 4-gauge wire.

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