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Can You Use 15A Breaker on 20A Circuit and Vice Versa?
https://www.electricaltechnology.org/2025/08/use-15a-breaker-on-20a-circuit-20a-breaker-on-15a-circuit.html
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Is It Permissible to Use 15-Amp Breaker on 20A-Amp Circuit, or 20-Amp Breaker on 15A-Amp Circuit? NEC Requirements for 15A and 20A Circuits