I just had our annual furnace tune-up and the guy who performed the inspection gave us a B tag violation because the electrical supply wire to our gas furnace is corroded and copper wiring is exposed. I am going to contact the company who installed it to look at fixing ASAP but the technician who found the issue said he has never seen it before and can't say what caused it.
The furnace is located in our basement near the foundation wall, and being an older house, there is some dampness/potential leaking happening (will have to wait for our first spring before we know the full extent) so my first guess would have been water damage, but could it have damaged the wiring this badly? And what is that white crusty stuff?
Furnace installed and all the electrical was redone in 2017 when previous owner flipped the house.
I am just wondering if anyone has seen something like this before and can confirm the cause, and if it's something I should be worried about reoccurring after the wire is replaced.