Taking the water's bonding from a gas pipe?

[Richard]

It needs to connected to the main earth terminal of the installation with a minimum of 10mm sq of copper conductor or another material of the same conductance within 600mm of the point of entry to the building. By the regs theres nothing to stop you using the water rising main as a conductor if its continus copper and you are responsible for it and linking to the gas but with the increased use of pushfit and plastic pipework care must be taken. Some sparks will not agree with the above but its an option within the regs just not widely applied. A gas pipe cannot be used as an earthing conductor though.

 

[Spudnik]

A little late down the line, but remember the OSG is a GUIDE and not BS7671.