Steel Wool and Electrical Cables

[Prawo Jazdy]

I've recently moved into a rented place in a rural location. I thought I heard mice in the roof last week, but it doesn't look like they've been in the living space, so I thought I'd plug up any gaps with wire wool.

I hesitated around the fuse box. There's a big gap going somewhere dark and mysterious where the cables come in, but I'm a bit wary of putting steel wool next to these. Am I right to be concerned, or is there nothing really to worry about in doing this?

[Prawo Jazdy]

I suspected as much. It's not intended as a deterrent, just something they're unlikely to want to gnaw through in order to gain access to somewhere. I wonder if scrunched aluminium foil would do the same job but be safer...

[Prawo Jazdy]

From what I've read they'll just eat through expanding foam. I realise aluminium is conductive, but it was the potential fire risk of wire wool that was on my mind. Maybe I should just get an eagle.

[Prawo Jazdy]

As it's not my property I don't want to faff about with concrete, but polyfiller seems a good option if I can get it to stay in position (it's a gap in the ceiling where it meets a wall). Cheers for the suggestions.

[Prawo Jazdy]

I can't find an impedance value for cheese in my data book...