Use of crimped lugs and bonding to boilers

[BristolSpark]

Can you use crimp lugs (ring or fork type yellow tipped ) on the earth cable when bonding main incoming water and gas pipes. I assume this is ok.

Also with respect to combi boilers. Do you still have to bond the main pipes under boiler in 4mm or is that now not required due to the dual RCD scenario. system is TNC-s

 

[bugsy]

You can use ring crimps however I think you wlll find the yellow ones are 6mm co your main bonding conductors will not ft
Depends on boilers location and plumbing installation