Morning,
During one of my investigations behind the kitchen sink, I found that the earth bonding wires to the water pipe were detached (I blame the plumber).
I checked all bonding points and found that:
Earth bonding to gas, water and central heating is done with 10mm^s. This connects to a block under the CU, and then via 10mm^2 to the earth bar in the CU.
The supply (TN-C-S, I think) uses 10mm^2 earth and 16mm^2 L&N. I was expecting these to all be one size fatter (16mm^2 earth and 25mm^2 L&N), but maybe this is enough for a supply fused at 60A.
Does this sound compliant with current regs?
Gerd.