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Thursday debate BS7671 vs CoMCoP & Gas Safe

Sergio Fernandez

I was on FaceBook the other day a saw a meter box which had the gas meter removed.  They had connected an Earth/Bond cable to the 2 ends of the remaining now defunct gas pipes.  It seems this is standard practice when a Gas meter is removed.

Several questions and points to discuss
If there is NO earth clamp on the customer side of gas meter within the permitted length of 600 mm of the outlet union of the meter; and before any branch (tee) in the pipework should the Earth bond be installed by the Gas meter engineer?  The practice of just putting the bond across where the gas meter used to be without proper consideration means that a healthy Ze and Zs could be compromised.  Additionally they could accidentally introduce potential into the building.  Do the Gas meter engineers test to see if this is an Extraneous conductive part?

Scenario 2
There is an Earth Bond of customer side of meter do the Gas meter engineers check with a clamp meter to see if there is mA or Amps.  mA probably being acceptable but Amps not acceptable.  Consider a PEN fault




As always please be polite and respectful in this purely academic debate.




Come on everybody let’s help inspire the future.

Parents

  • Unless of course the gas supply has the insulating unions required under the latest ENA guide 12, and most notable by their total absence from any real installation.

    However the rules say

    "5.2 Earthing terminal
    5.2.1 Provision of earth terminal
    PME earth terminals can be offered to consumers unless there are reasonable grounds to believe either:
    - their earthing installation is not designed to BS 7671.
    - or
    - the type of installation is not suitable for PME. (See Section 6 for examples where it may not be possible to provide a PME earth terminal).
    Where a metallic gas service is provided to a consumer’s premises with a PME earth terminal, an insulated insert should be fitted in the gas service."

    Mike.

    PS wiring matters did a thing on this you know... https://electrical.theiet.org/media/1189/insulation-inserts-in-metallic-gas-service-pipes-to-consumers-premises.pdf

    when that article came out, for a giggle I did try and buy an insulating insert at the local place that does gas stuff, and I would have had more success and less funny looks if I had been asking for tartan paint !!

  • in reply to mapj1

    Might be worth a read.  Not sure if this is still current

    https://registeredgasengineer.co.uk/technical/technical-bulletin-102-2/

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