I came across a slight problem when doing a new install. When the consumer unit is isolated and main earth out, I'm getting 100v between netrual and gas bonding, when main earth back in there is no fault? Tncs supply.
I have aProblem working out maximum demand and diversity. I have 8 circuits
20x 10w down lights
1x 5 kW heating ring
1x 4.5 kW heating ring
2 x socket ring
1x 7.2kw hob
1x 3 kW oven
1x 10.5 kW shower.
The problem is using the on site guide I'm getting 154.3 a!!!! What am I doing wrong...