For an all-copper system like mine, Whitfield shows the water pipe
> earthed on the *street* side of the stopcock, whereas the gas pipe it is
> on the *house* side of the stopcock (Fig 5.13). I'm assuming that's
> correct but can't understand the logic behind it - before I unpack my
> earth clamps please can someone explain?!
I must be Irish - to be sure to be sure - but always bond both sides of the stopcock and gas meter/cutoff valve. Clamps ain't expensive.