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Discuss Earthing a gas pipe in attached garage in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. PhilCapron
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    PhilCapron New EF Member

    Location:
    marlow
    My house has a PME earth system. The gas pipe in the garage has a 6mm earth wire already but I've been told this should be changed to 10mm.I'm having an EV charging point fitted externally which required an earth rod to be installed (32ohms impedance measured)-PME cannot be used with an external EV charging point. Would it be acceptable to disconnect the 6mm PME earth from the gas pipe and connect the 10mm cable to the EVSE earth rod?
     
  2. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    is the garage separate from the house !
     
  3. Pete999
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    Pete999 Trusted Advisor

    Location:
    Northampton
    If the GAS pipe in your garage is the incoming feed to your house, then you need to BOND it to the MET which will be at the entry point of the Electric cable and meter, you are not earthing the gas pipe you are bonding it to earth
     
  4. Pete999
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    Pete999 Trusted Advisor

    Location:
    Northampton
    No
     
  5. HandySparks
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    HandySparks Trusted Advisor

    Location:
    Hampshire
    Business Name:
    Neish Electrical Services
    No. It'll be a bonding conductor (not an earth wire), which needs to be connected to the main earthing terminal near the incoming electrical supply, not a separate rod.
     
  6. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I would say no on the basis the existing 6mm is running to the house CU / MET and the advice you have is that this needs to be upgraded to 10mm - back to the CU / MET.
     
  7. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    Make the entire garage TT bond the gas in the garage to the TT system. The EVC point can then be connected to the TT system. Run a seperate 10mm bond from TNCS MET In the house to point of entry of the gas to the house. Assuming garage has own board and RCD.

    Edit: ignore this as I assumed it was detached from the house.
     
    Last edited: Aug 11, 2017
  8. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    what's the betting the garage is attached to the house!
     
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  9. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    lol....I must admit I had assumed it was detached.
     
  10. Murdoch
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    Murdoch Electrician's Arms

    Location:
    Woking
    I think the clue is in the thread title...
     
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  11. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    remember playhouse ,is it a round window or square window!
     
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  12. Wilko
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    Wilko Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Hi Phil - let me paraphrase a sentance from the EV charging Code of Practice section 6.6 "when an EV charging point is supplied from a dwelling with PME, earthing and bonding require careful consideration". Then there's the EV section 722 in BS7671, another riveting read, no doubt.

    It sounds like your gas bonding was not up to scratch from a change to PME and so that just needs to happen. The design of the EV system is another thing, imho :)
     
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    • Agree Agree x 1
    Last edited: Aug 11, 2017
  13. Leesparkykent
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    Leesparkykent You Rock Gmes Staff Member Trusted Advisor

    Location:
    Kent
    oops :oops:
     
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  14. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    upload_2017-8-11_17-51-0.png we will have to wait on this one!
     
  15. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    these threads are getting slower ever day we need to have count down clock.
     
    • Funny Funny x 3
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