KyleFowler
Member
- Location
- Maryville, TN
- Occupation
- Electrician
The other day on a jobsite someone ran a hanger self tapping screw into one of the two paralled lines for a 800 amp 480v feeder. Thank God it was off when they did it however it made for a nice bang when it was turned on, simultaneously tripping the 2000 amp main and blowing one of the utility transformer fuses, fun times. Anyway, after fixing that we discovered that all 40 of the Sq D QOB 120v GFCI breakers would no longer trip when using any GFCI plug testers. Installed new GFCI breakers and voila everything is good now. We tried busting a few of the breakers apart to see what happened with no smoked parts or anything weird to be seen. Still cool to see inside a GFCI breaker though lol.
So what happened? Obviously the big short caused it but it didn't blow out any lights or other stuff. Just curious. Thanks in advance
So what happened? Obviously the big short caused it but it didn't blow out any lights or other stuff. Just curious. Thanks in advance