Re, the armoured cable. I was friends with a farmer and he kept chickens and pigs and had 3 phase power to his machinery, grain milling and boiling equipment for pig food.
The cables ran along the top of the walls and were run on a catenery btween buildings. he asked me one day to fit a new cable and showed me where the rats had taken off all the sheathing from the red,blue and yellow cables as they ran along the wall. This was evident as the rats droppings were all coloured!
Duly fitted new cables, armoured and thought to myself, job well done, except that a couple weeks later i saw that the rats had taken off the plastic outer sheathing and left bare the armoured wire! They would also go across the catenary wires to get from one building to another.
In we go with two Jack Russels, Oh boy, how they worked the rats. First night about 20 or so and this went on for months. There ssemed to be no end to them until the chickens and pigs were sold off, now there are no rats.