Had a call for a possible fire in a house about 8-9 years ago, in the middle of a f-r-i-g-i-d winter spell - something like -25 nightime. (Cold, even for Chicago) Turned out that someone had wired a side light for the house (old round w/p box) with bx, and failed to install a 'drip loop' (basically installed it indoors through a hole to the outside w/p, but somehow it became a drain tube as well) the resulting corrosion finally generated enough heat to start scorching the trusses in the attic, resulting in our being called for "smell of smoke". Caught the fire before it progressed out of hand.
