earth bonding

[mikegray]

we are having a new bathroom
the plumber has no electrical knowledge
is he responsible for earthing the system ?
i know all the copper pipes need cross bonding to earth
can i run the earth cable to the earth of the shower cable or
does the earth wire have to be a seperate wire back to yhe consumer unit

 

[Big_Spark]

Mike, the initial Earth for any set of pipes should come from the nearest electrical accessory, in your case this could well be the shower, and if that is the case then you are correct that you can run the appropriate sized earth from here.

You do not need to take it back to your consumer unit, however you do need to bond across any compression joints that might exist, soldered joints are fine though.

Regarding the Plumber, unless he is Part P registered to self certify any electrical work he undertakes (Usaually for heating systems etc) then he will not be responsible for the supplementary bonding, and from your comment about him I would assume he is not Part P registered.

 

[mikegray]

Thanks

what size earth cable should i use ?
the shower will be a 9.5 kw one if this relavent

 

[mapj1]

there is a nice explanatory leaflet referenced in the 'sticky for reference section' this has nicer pictures than I can describe.