Damn Earthing!

[SSE]

The house I am working at has been sheeted, filled etc and now the woman has decided she wants a whirlpool bubble bath in. There was already a supply in for something else that I can use as it's not needed now but still have a question. As all circuits are going to be rcd protected I was told there was no earthing required in the bathroom but on the installation instructions for the bath it says all conductive parts including hot and cold pipes on bath, metal supports etc must be earthed in no less than 6mm. The pipework in the house is done in plastic and copper and in the bathroom to the bath goes copper-plastic-copper at the taps. Do I need earth this or not?

 

[Deleted member 9648]

Thanks. According to that link "If some of the services are of metal and some are plastic, then those that are of metal must be main bonded" I take it that just means my main bond where its metal needs to be bonded, not everywhere where theres a metal pipe on that services, as it changes back and forth between metal and plastic?

Yes, refers to main bonding...which is required to incoming services liable to introduce an earth potential. The earth potential is being introduced from outside.....hence main bonding must be carried out close to the point of entry or on the first accessible metallic section. Beyond the main bond it doesnt matter whether continuity is broken by plastic sections, as the hazard from externally has been dealt with.