Rodent Nests In - Ceilings Walls & Insulation
Rodents Chew wiring under insulation and in walls and they build nests to make a nice home for them selves. The Nests are often made up of very shredded materials including- Metal foils, paper materials rags and so much more which are very likely to ignite if an arc fault occurs by the Rodents chewing on your cables.
Take action place Rat & Mouse Baits often.
1. Rodent damage to cable 2. Nest (cable from item 1 removed from nest) 3. Rodents causing permanent damage in new appliances.

4. Rodent damage under "Thermal Insulation" cable was damaged by rodents under the Ceiling Insulation in multipule places.
Note well -Where Rodent damage is found: It is strongly recommended to ensure all your Safety Switchs are installed to all circuits as per the curent standards.
Have Arc Fault Detection Devices Installed.
Upgrade your mains operated interconnected photo electric smoke alarms.