There’s a big hole in my basement ceiling that allows wiring to go up to my dishwasher above. There is a single wire running from the basement through this hole and up to the upstairs level. This hole is big enough for a rat to go through, let alone a mouse. I stuffed steel wool in that hole around the wire so that mice cannot go through it. Is this a fire hazard?
No, some steel wool in a hole should not be a big fire hazard. But be aware that if there are mice in your basement, closing off one hole to the upstairs is not going to keep them out of that area.
Updated on January 15, 2018
By Dan Harmon