electric shower cold water feed

Im installing an electric shower but i want to know if there is a problem if i use plastic pipe to feed the cold water into it.I was thinking there might be a prob with earthing(cross bonding)
T I A....GM
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Im installing anelectric shower but i want to know if there is a problem if

Nope, plastic's fine.
The shower itself will be earthed: it certainly doesn't rely on its water supply pipe for this in any way.
As for any installation the incoming cold water supply should be x-bonded to the electrical supply earth (by the meter) and to the gas.
(Q for the panel: if the incoming water pipe is MDPE and the installation pipework is also plastic does one x-bond the stopcock?)
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