Earth Bonding ?

[pwdrive]

Does anyone know what the regs are for earth bonding within a domestic dwelling?

I have a plastic mains water pipe into the house via a stop tap, this connects to a 15 mm copper pipe, this supplies all the water systems in the house, what should the earth bonding arrangements be, do I have to bond the sink in the kitchen?
All hot and cold water pipes in the house are copper, both for H & C water and C/H.

Lawrence.

[tiv48]

its all changed in th 17th edition of the regs
see http://wiki.diyfaq.org.uk/index.php?titl...nd_Bonding but no two people seem to give the same answer.
rob t

[pwdrive]

Hi Rob t, I am thinking 10 mm squared earth from consumer unit earth to cold water pipe, then supplamentry bonding of all pipe and metal work in the bathroom with 6 mm squared.

Lawrence.

[tiv48]

that sounds right to me .we have just finised a rewire on a cottage in cornwal ,when we started under 16th eddition lots more things had to be bonded leaving unsightly earth wire on show by the time we finnished under edition 17 a lot could be removed.
dont forget no bonding to gas pipes any more. more complex is zoneing ie in bath rooms ect.
rob t

[pwdrive]

that sounds right to me .we have just finised a rewire on a cottage in cornwal ,when we started under 16th eddition lots more things had to be bonded leaving unsightly earth wire on show by the time we finnished under edition 17 a lot could be removed.
dont forget no bonding to gas pipes any more. more complex is zoneing ie in bath rooms ect.
rob t

Thanks Rob t, no gas to worry about where I am, there are no electrical outlets in the bathroom and no electric shower, the lights are flush fitting to the ceiling with no metalwork visible, I have two 4" extractor fans in the ceiling that I think were double insulated, again no visible metal work etc.
So far as I can ascertain the supplementry (equipotential) bonding has to be done with one unbroken length of wire between the various pipe connections in the room, the radiators are small 10 mm feed so I don't think the standard bonding clamp will fit so I will bond the main flow and return pipes for the radiators at the back of the boiler stove.

Lawrence.