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Hobson's Choice?

Q. You recently visited a bungalow to do some electrical work. The owners had just moved in. You had an opportunity to check the electrical installation. The main gas bonding was obvious as the 10.0mm2 green and yellow cable ran externally.


You looked under the sink in the base unit, but could really only see a copper pipe rising from the floor level up to the taps as the back of the cupboard restricted the view. A 3 inch (75mm) diameter hole had been cut into the back panel for the operation of the main water stopcock handle. There were other copper pipes visible as well. It was unclear as to the type of main cold water supply pipe. The bungalow was built in the 60s/70s.


You have an old  Minor Works Certificate  given to you for the bungalow. It states that the main water pipe may not be main bonded.


You are then given a very recent E.I.C.R. stating that the main water pipe is plastic and main bonding is not required.


Do you:


1. Main bond the water pipe?


2. Buy an endoscope and have a good look?


3. Do nothing? Trust the E.I.C.R.


4. Ignore the issue.


5. Rip out the kitchen base unit that obscures your view?


6. Ask Fred down the pub?


This site changes stopcock to stop c***


Z.

Parents

  • The combi gas boiler is in the loft and has many metal pipes running to it. All are very well bonded to each other. It is suspected that the metal water pipes are bonded via them. So the gas bonding would have to be disconnected to confirm extraneous conductive parts or not.



    I don't think so - with my procedure internal parallel paths don't matter - in effect we're testing whether the whole system is extraneous or not - if the gas is plastic coming out of the ground, and the water is too, then with the supplier's earth disconnected there should be little or no connection between the MET or any internal pipework to true earth. Any bonding between the MET and internal metal has pipework shouldn't affect that (nor the boiler c.p.c.).


      - Andy.
Reply

  • The combi gas boiler is in the loft and has many metal pipes running to it. All are very well bonded to each other. It is suspected that the metal water pipes are bonded via them. So the gas bonding would have to be disconnected to confirm extraneous conductive parts or not.



    I don't think so - with my procedure internal parallel paths don't matter - in effect we're testing whether the whole system is extraneous or not - if the gas is plastic coming out of the ground, and the water is too, then with the supplier's earth disconnected there should be little or no connection between the MET or any internal pipework to true earth. Any bonding between the MET and internal metal has pipework shouldn't affect that (nor the boiler c.p.c.).


      - Andy.
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