Went to a customers house because he smelled burning plastic in the garage.
Opened up the panel and found that the 2 pole 30 amp circuit breaker that powers the pool equipment was charred. The back of the breaker was burned badly. Also a couple of the surrounding breakers were charred. My question is why did'nt the main breaker trip to protect the buss bars? Why did'nt the 30 amp breaker trip? This home is not that old probably built around 1995-2000. 200 amp Siemens panel with a 200 amp main breaker. Anyone seen this before. Thanks for your feed back.