Got a service (warranty) call from an old customer. Breaker was tripping, they swore up and down that nothing electrical had been moved, opened, changed, etc.
Breaker won't stay on, and dims the lights for a split second before it trips. Sounds like a bolted fault.
An hour and a half later, I narrow it down to this:
![[Linked Image from users.stargate.net]](http://users.stargate.net/~vkkelly/badgfci3.jpg)
How was 12 Ohms acting like a bolted fault?
Was the resistance decreasing with line voltage (rather than the 3VDC test voltage in the pic)?
I thought UL insisted that devices die in a safe manner...
Would you consider this safe?
Corrosion from having a small hot-tub plugged in (no in-use cover... Job was before 2002, and they didn't tell me about the hot-tub) was the main culprit. They're getting an in-use cover today!
