Main earth tns

[davesparks]

wrong the MET in domestic is within the ccu so thats what you write down.

What on earth would the MET be doing inside a cooker control unit?

The MET can either be the earth bar of the CU or an external earth block, personally I normally fit an earth block.

 

[Andy78]

I'm with the other Andy on this.
The earthing conductor is the conductor between the means of earthing and the MET. If the MET is in the CU then you only have one conductor anyway. If the MET is external to the CU, then the conductor between the CU and MET is really a CPC.