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O PEN Devices and Supplies

Yassir Khalil

Just as a topic of discussion, O PEN devices are now required to be installed for EV chargers either inside a consumer unit or the Charger itself for TN-CS PME supplies 
when do you think it will become a requirement to fit these devices on final circuits or supplies where metallic objects are connected, for example kitchen appliances or protective bonding conductors connected to pipe work or the use of appliances outside surely the disconnection of the all conductors and CPC and bonding conductors is requirement in the event of this fault occurring. Any Thoughts ?  

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  • I foresee the same with OPDDs, starting with the next edition of the EV code of practice I suspect they will become the preferred option where an installation is PME and eventually I suspect all new TN installations will require one. 

    There was a suggestion a while ago that open-PEN detection (based on L-N voltage) could be easily built-into smart meters - they already have voltage measurement and a contactor already built-in - even if they only disconnected the load leaving the PE connected it would be an improvement (if all loads were removed then the PEN wouldn't be at a hazardous voltage) - and of course they can automatically inform the DNO of the problem and possibly wait for the DNO to signal that the repair had been made before reenergising).

    But of course we live in a world where we couldn't even get the smart meter installation program to include an isolator, so that's going to be far too much like joined-up thinking....

        - Andy.

  • in reply to AJJewsbury

    The suggestion re SMART meters would not be to disconnect the installation (that may also not take away the problem due to diverted neutral currents and shared extraneous-conductive-parts) but instead to notify the DNO so they can investigate.

    I believe this is proposed for (if not actually being implemented right now in) Australia.

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  • in reply to AJJewsbury

    The suggestion re SMART meters would not be to disconnect the installation (that may also not take away the problem due to diverted neutral currents and shared extraneous-conductive-parts) but instead to notify the DNO so they can investigate.

    I believe this is proposed for (if not actually being implemented right now in) Australia.

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