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[muldave65]

if i use pushfit fittings connected to copper surely i dont need to earth clamp them

[bobplum]

ive not got the water regs book at hand but there is a belive that the clamping ring(metal) inside the pushfit may act as a conductor for the two copper sections either side
for the small cost is it worth not doing

[cyclop.orangehome.co.uk]

As there is no electrical path through a plastic pushfit fitting,even with copper either side, you will have to bridge the fitting with earth clamps.