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your utility pipes, if metallic, should be bonded back to a Main Earth Terminal (MET) at the incoming point of the electricity supply, i.e. where the meter is.
if this is not the case then contact your electricity supplier and have them install the MET. sometimes an electrician will do this, but there are cases where the methods used are unsatisfactory, and if the electricity supplier finds out it's been bodged then they're not happy.
once a nice solid earth reference in place then the metallic pipework can be connected via tagged band clamps, plus a substantial earth tail run into the new CU.
rive_gauche
@aggi
In a similar pipes and earth story I've discovered that my gas and water pipes are lacking an earth feed back to the consumer unit. I'm planning to upgrade my dated old fused consumer unit for a nice new RCD but the electrician has told me that to certify this the earth feed needs to be in place.
Given my fusebox is at the front of the house and boiler at the back it looks like a wire will have to be led back along the top of the skirting and around door frames or similar. Anything special I need to think about when doing this?