10 mm water bond ?

[BillyH]

I need to upgrade the bonding on a current installation but am having a problem locating exactly where to bond to. The consumer is in the cellar and so is the stop tap, however at some time in the past the pipe from the stop tap has been replaced with plastic, run across the wall and then disappears under a concrete floor. No one at the property knows where the platic ends and copper begins.All pipework throughout is copper except for the 3 mtrs from the incoming main.

Where would it be permissable to bond the 10 mm

 

[malcolmsanford]

Ive been arguing this point with warm front inspectors for years. They dont care if its plastic incoming. they still want ME bonding on the first avilable bit of copper.

Have you advised them about how you can prove if it is/or isn't an extraneous conductive part?

Often even sometimes though the water supply in the house is plastic in places or even a plastic main incomer, if there is copper pipe to gas and the water supply to the boiler is also copper yes some parts of the installation could via the gas pipe be extraneous conductive parts.

A quick and easy test is IR with a wander lead on the main MET to the metal in question and if you have >22 KΩ then it is not an extraneous conductive part and no need for supplementary bonding.

I know the gas regulations still advise cross bonding and so perhaps they are using this as a belt and braces scenario, until something goes wrong that is