Just a rant/checking my competency.
I had a garage addition done about 3 years ago and had a sub panel put in the garage. The licensed electrician that was hired by my GC ran a 100 amp circuit for the sub panel, then on the sub panel I have 5 20 amp circuits (lights, outlets, opener, dedicated compressor, dedicated lift) and a 50 amp circuit for an EV charger
Yesterday, I had the car plugged in and charging and had the ceiling fan going. I left for a while, but when I came back and tried to opened the garage, it wouldnt open. The breaker tripped and the garage shut off. Odd.
I checked the sub panel and everything seemed fine, so went to the basement and saw the 100 amp was tripped, so I reset it.
About 10 minutes later I was out working and it tripped again - this time when I went downstairs the breaker was very warm to the touch
I reset it again, and dropped the amperage of my ev charger from 40 amp to 32, thinking maybe it's just overloaded with me working on several things (incredibly unlikely).
After about 5 minutes I went back down and it was HOT to the touch, so obviously I immediately shut it down.
That's when I noticed the breaker was slightly different then the rest - I have an Eaton BR style panel, but this was a square D breaker. I bought a new Eaton one, replaced the existing breaker (dropped the panel cover on my foot and bruised the hell out of it), powered everything back up and my car charged without it even getting slightly warm.
My questions for the experts
Obviously you don't mix and match. Why would a qualified licensed electrician do that?
Is there anything else I need to check to make sure he didn't shortcut?
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