@happypat In the olden days electricity wires were overhead but now they are all underground and each box is where the cables run from the underground feed and is the junction box that supplies about half a dozen properties. If they have to cut the electricity to any particular property at any time it is easier to cut it at the junction box rather than dig a great hole in the ground to find the cable that feeds each house.
Ian
@quietpurplehaze I think the little mouse is perfectly safe, he is just reading his book.