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Bonding District heating Pipework,

Toby Knox

Hi

Everyone's favourite topic Earthing and bonding, Some background information, We have insulated metallic pipes going under ground to several blocks of flats. Each block has an intake room where the pipe work enters from the ground to the energy centre 1 kilometre away. Each block is at a different stage of construction with some being occupied. After spending some time on site I am yet to see any bonding in place for any pipework. I'm aware of the test for extraneous-conductive-part but due to these being occupied the pipework has meters, probes ect which creates parallel paths and the buildings in early construction phase only have temporary power with no reliable MET to test with. 

So many question how can I determine if the existing pipe work requires bonding and how can I test the new pipework with no reliable earth?

Attached is an photo of the intake room pipe work in the early stage of Construction.

Thank-you for any help on the matter.

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  • 0

    Hi Toby. It appears, in this case not currently possible to determine if an extraneous-conductive-part through measurement? The image appears to depict a conductive component that could introduce a potential and is not part of the electrical installation. Just to add, it is important to consider that even an apparent extraneous-conductive-part, which is not liable to be touched, would not necessitate bonding. For instance, this applies to ‘earthy’ metallic pipework that is enclosed by insulating material (e.g., boxed in).

  • 0 in reply to AMK

    Hi, Thankyou for the responses, I did consider this however at points the metallic pipe work is exposed for gate valves ect. If it was enclosed in its entirety then sure I would understand why this might negate bonding however these exposed parts are liable to be touched. 

  • 0 in reply to Toby Knox

    Hi Toby,
    I wanted to inquire if the gate valves etc are simultaneously accessible to exposed conductive parts.

  • 0 in reply to AMK

    Hi 

    Yes, The pipework runs parrel to a ELV tray for sensors which leads to the BMS panel, There's also serval FCU above the pipe work for Heat meters ect.  

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