re: AFCI - Breaker keeps tripping.

quote:

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Removed the wires from the breaker. Got scared it would burn it down.

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If you pulled the wires from the breaker, then the white should show infinite to ground as well as the black. Any current reading between any pair indicates a problem.

Since it take so long, I would suspect it is something plugged/wired into the circuit, though a "bleed" to ground could cause this issue (a nail or such that just nicked a wires insulation). Do you have anything on the circuit like dimmer switches, lighted switches or maybe outlets with lights or usb power plug ins? Is it possible that circuit powers up anything in the attic or a doorbell transformer? Just trying to think what may be causing the issues. Another possibility is you have some loose connections but that would likely only cause an issue if it is powering something.

These types of issues are a PIA. If you can afford to do it, calling an electrician may save you some headaches.