code query.

[graham123]

A 20 room accomodation block, built 1970s main incoming water is pvc. Which then changes to copper. No evidence of a main equipotential bonding conductor leaving the main db or anywere bonded at main incoming location. Continuity check <0.02 Ohms. Would you f/I this?. So then shower rooms have no supplementary bonding installed. All continuous copper pipeowork. And no rcd protection on lighting circuits. All final circuits are via hrc fuses. So I could C2 the lighting circuit. However as the water main is pvc. I have been told their is no need for the supplementary bonding and the lighting circuit would only be a c3?

 

[telectrix]

lif no RCD protection to bathroom circuits it's a C2 if there's no supp. bonding.

 

[davesparks]

Have you tested the pipework to establish whether it is extraneous or not?
Have you tested to establish whether supplementary bonding is required

 

[malcolmsanford]

A 20 room accomodation block, built 1970s main incoming water is pvc. Which then changes to copper. No evidence of a main equipotential bonding conductor leaving the main db or anywere bonded at main incoming location. Continuity check <0.02 Ohms. Would you f/I this?. So then shower rooms have no supplementary bonding installed. All continuous copper pipeowork
If the water service is PVC coming into the building then there is no chance of that introducing a potential so no coding. The copper internal pipe system may be a different story if there is a gas main that is metalic. There could be a possibility that if the water and gas main are interconnected in the system ie at a boiler, then that pipework could pick a potentuial difference. You should test to see if the water copper system is an extraneous conductive part.

And no rcd protection on lighting circuits. All final circuits are via hrc fuses. So I could C2 the lighting circuit.

What are your Zs values for the circuit. Does it disconnect within 0.4secs?
However as the water main is pvc. I have been told their is no need for the supplementary bonding and the lighting circuit would only be a c3?

See above