Trying to remove an old wall oven I foolishly removed the microwave to make the unit lighter. I am left with an uninsulated wire in the oven chassis that sparks and smokes briefly when cut. The oven has been sitting with power off (at breaker) for a week, but the wire still smokes when cut.
1) What is this wire 2) Is there a way to make the oven safe to remove and handle?

Thanks in advance .

[IMG]https://www.evernote.com/shard/s6/sh/828a5941-e11c-4cb1-ad3f-b6b137bc1fad/f68944a92a484328cb5630b4a7c8cb44[/IMG]