In message ,
"ARWadsworth" wrote:


"Martin Angove" wrote in message
...


300mm (a foot or so) is not generally regarded as being enough of a
break to completely isolate one side from the other due to the water
inside the pipework. As Christian suggests, the best thing would be to
use a meter or more of plastic which is likely to be enough.

Agreed, but we are (I hope) talking about flexible push fit tap connectors
for the final connection from copper pipework to the taps.

I'm not sure you can imply this from the OP. FWIW, my initial mental
picture was of the OP leaving the existing taps with a short tail of
3/4" and then using a flexi to connect to the new 22mm incoming. Under
these circumstances I'd suggest it is both possible and debateably
desirable to jumper a short length of plastic.

If the pipes
supplying the plastic/flexible hose are bonded then you can ignore the
jumping of the hose with an earth lead to the taps.

And of course under most circumstances it's nigh on impossible to bond
that close to the tap anyway, as you say later :-)

Interesting question that then... it is entirely possible, under
circumstances where the final connection to the tap is a short length of
plastic, for the tap to be "earthy" via the conduction of the water, but
not part of the supplementary bonding due to a: impossibility of
attaching an earth to the tap and b: plastic washers and so on isolating
it from the bonded body of a metal bath.

Hmmm... Even if the bath were plastic/GRP etc. it wouldn't work unless
the plastic section of pipe was, as suggested, some 1m or so.

Hwyl!

M.

--
Martin Angove: http://www.tridwr.demon.co.uk/
Two free issues: http://www.livtech.co.uk/ Living With Technology
.... I'm not schizophrenic. It's this guy beside me!