re: I need a good electrician in the mandeville area today or tomorrow. Please recommend one.

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It did work before, but it would trip often. We’d just go and reset it and it’d be good for a week or two. Now it trips after 15 minutes.

We did add a water pump to the circuit, but that’s all that’s new and it’s hardly ever on. We did add about 8 more plug ins to the whole circuit, but nothing is plugged into them.

I don’t know what gauge the wire is.

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The frequent tripping may have indeed weakened the breaker and a new 15a might get you back to where you were but unlikely to stop the problem. There is a decent chance it is the motor in your pump cycling and the inrush current is tripping the breaker that already has a load on it. It may be time to run a dedicated circuit for the highest load which is likely the pump motor.

If I had to bet I would guess your pump motor load runs afoul of NEC 220.14(C) calculations.