What code would this be?

[hillbillie]

Domestic single phase TN-S

Tails to the d/b are 25mm but the earth is 10mm.

I see table 54.7 in the BGB says that 16mm would be needed but would this be C2 or C3?

 

[telectrix]

read 543.1.4 first. if you decide to use the adiabatic and then find that 10mm is adequate... no code. table 54.7 is used as a rule of thumb if you don't want to go to the trouble of calculating the csa ( 543.1.3 ). if adiabatic fails the 10mm, then a code 3. IMO.

 

[hillbillie]

Many thanks.