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Bonding

Guy Chapman
I have an extension going on to my house and it has engineered joists. I am going to run cables in steel tray, for tidiness, and I am assuming this would be considered an ECP and should be bonded (that makes obvious sense to me). It will carry ring and lighting circuits. I cannot imagine that more than 10mm2 would be required for this, but every time I read new guidance they seem to have upped the ante. What do people think? And do you use link jumpers between sections of tray, or are the bolts sufficient? I've not seen anything to suggest that copper jumpers are needed, and we don't use them in datacenters (the day job), but that's just CAT7 and fibre.


Also because Reasons there are no spare ways on the earth block on the board. Do I have to source an earth block of more than 8 ways or is it legit to join two blocks together with 16mm2? I don't want to look like a pillock and have the sparks refuse to energise the circuits when done.


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    geoffsd:

    Only extraneous-conductive-parts require bonding.


    If it is not then it would be earthing, which will introduce an unnecessary hazard.


     


    There is Functional Bonding ... if provided for the purposes of EMC, as other contributors of this thread have posted, Regulation 444.5.3.1 uses the term "bonding". BS IEC 61000-5-2 uses the same terminology.


    The reasoning is :



    • it is provided for the purposes of equalization of potential to reduce the impact of radiated disturbances - although of course, it's not protective equipotential bonding.

    • there is not necessarily a connection to Earth involved in this type of functional bonding, although in most installations, a common bonding network (CBN) for EMC mitigation purposes is effectively connected to Earth via at least one point (the MET, via extraneous-conductive-parts bonded there and continuing inside the installation, or via exposed-conductive-parts).

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  • 0
    geoffsd:

    Only extraneous-conductive-parts require bonding.


    If it is not then it would be earthing, which will introduce an unnecessary hazard.


     


    There is Functional Bonding ... if provided for the purposes of EMC, as other contributors of this thread have posted, Regulation 444.5.3.1 uses the term "bonding". BS IEC 61000-5-2 uses the same terminology.


    The reasoning is :



    • it is provided for the purposes of equalization of potential to reduce the impact of radiated disturbances - although of course, it's not protective equipotential bonding.

    • there is not necessarily a connection to Earth involved in this type of functional bonding, although in most installations, a common bonding network (CBN) for EMC mitigation purposes is effectively connected to Earth via at least one point (the MET, via extraneous-conductive-parts bonded there and continuing inside the installation, or via exposed-conductive-parts).

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