Even though a lot of heat was present, the fault current did not exist. The plastic melted, probably due to a poor connection, but the hot leg and the ground or neutral never came in contact with each other. If there was truly a short between legs, then the breaker would have tripped. Because there wasn't a short condition, the breaker stayed closed, which could have caused a lot more damage, but you got lucky.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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