expanding foam sealant问题请教

I learned that One of the things to do to keep mice away is to seal openings of our home to the outside if they are bigger than a dime.  I live in a big building.  So I found a few openings in the utility closet.

 

1. In Pic 1,the tube has two drain pipes inside.  So should I seal the gap between the wall and the tube?  Or the gap between the tube and the pipe?  All seem to be around the size of one dime.

 

2. Picture 2 is the electrical switch for the gas furnace.  Is it safe to seal this area?  There are quite a few pipes.  Those are electrical cables? 

 

3. Which brand expanding foam sealant? 

非常感謝.