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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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    Extract from 411.3.1.2 (and as stated by Broadgage)

    In each installation main protective bonding conductors complying with Chapter 54 shall connect to the main earthing terminal extraneous conductive-parts including the following:

    (i) Water installation pipes
    (ii) Gas installation pipes
    (iii) Other installation pipework and ducting
    (iv) Central heating and air conditioning systems
    (v) Exposed metallic structural parts of the building.

    However there is a caveat:

    'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding.'

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  • 0

    Extract from 411.3.1.2 (and as stated by Broadgage)

    In each installation main protective bonding conductors complying with Chapter 54 shall connect to the main earthing terminal extraneous conductive-parts including the following:

    (i) Water installation pipes
    (ii) Gas installation pipes
    (iii) Other installation pipework and ducting
    (iv) Central heating and air conditioning systems
    (v) Exposed metallic structural parts of the building.

    However there is a caveat:

    'Metallic pipes entering the building having an insulating section at their point of entry need not be connected to the protective equipotential bonding.'

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