"CPC stands for
Circuit Protective Conductor, which is basically the earth wire for the circuit and forms part of a system to join together all exposed conductive (metal) parts and connect them to the main earthing terminal."
I can see no clue as to what route they took from the meter to the house CU.
(I cannot easily upload the photos I took to pfm).
Would it be normal for a building company in 2014 to have taken both 25mm meter tails all the way to the CU (which is about 7m) in the form of 25mm cables?
I don't know what is allowed under building regs, but the logical routes for the cable include:
- via a duct in or under the concrete floor?
- between the room ceiling and the first floor floorboards?
- somehow coming around through the walls, although no surface trunking is visible, so what part of the walls would they channel it in?
If it does come up through the floor into the stud wall of the under-stairs cupboard, how would an electrician access the fat cable there - by cutting a hole in the stud wall or through the CU itself?