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Equipotential Bonding

Jason Carthy

My question is what is the industry recommended practice for the following:

I have a waste water process site, The site consists of 3 MCC's fed from there own dedicated 11kV:0.4kV transformer. The site has its own 11kV network.

The majority of the process pipe work is located externally, Each system can consist of pumps and 400V actuated valves which are mounted in the pipework. Some sections of the pipework are buried in the ground. 

Can the pipework be considered as extraneous conductive part or an exposed conductive part due to the connection of the 400V pumps and valves. Is there any consideration to connecting all three LV Systems earthing systems together by the addition of any bonding conductors. The pipework may already be doing this. 

Reading the guidance notes 8 on earthing and bonding it  not 100% clear as it doesn't really cover industrial process installations. Any information would be greatly received.

Thanks 

Jason 

  • 0

    Can the pipework be considered as extraneous conductive part or an exposed conductive part due to the connection of the 400V pumps and valves.

    I'd say the valve bodies ( i.e. the bits containing the live parts - presuming they're class I and therefore earthed) are exposed-conductive-parts, while the pipework would be an extraneous-conductive-part (due either to being in contact with the ground, or being in contact with exposed-conductive-parts belonging to different a earthing system).

       - Andy.

  • 0

    Assuming this is in the UK... Does WIMES have anything relevant to say on earthing & bonding?

    It's been a long time since I've done work on a (W)WTW so my copies are out of date.

  • 0 in reply to Jam

    Thanks for your reply, WIMES is gives the standard reference to BS7671 & BS EN 7430 earthing code of practice. 

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