My coworker had a large sun room installed in the back of her house a couple years ago. An electric heater (or furnace/AC unit - I forget) was also installed, and it started acting erratically earlier this year.
An electrician found an electrical cable in the crawl space that showed evidence of arcing:
I am scratching my head trying to figure out why the arcing occurred. And I’m not even sure what the electrical path was… hot wire to neutral wire? Hot wire to metal sleeve in gas line?
Did chaffing of the cable insulation occur from being in contact with the gas line? Seems unlikely given the gas line has a soft jacket. And I don’t have any reason to believe there would be much vibration.
Could the cable insulation be chemically incompatible with the jacket on the gas line? Again, seems unlikely.