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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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  • unlike perhaps a lamp post which folk do not normally touch, and is planted in the ground

    Don't make too many assumptions about steel lighting columns - the root is usually painted with thick bitumen paint against corrosion and in many situations they're planted into plastic sleeves to aid later replacement - so contact with the soil can sometimes be a little precarious.

      - Andy.

  • in reply to AJJewsbury

    Very true, and there are other factors, the  ground may be dry, especially in a concrete or tarmac pavement,  but also the lamp load is physically small, and folk have no need to touch the thing- which is not true for cars which have handles especially for the purpose ;-)  I agree lamp post  earthing is not always going to be sub kilo-ohm, but often it will be, and my point was more that in the car case, every single one of these fortuitous safety factors is absent -  the stars are all wrong for the EV case. For other things such an unlucky alignment is less likely. Which is perhaps why after half a century of PME installed up and down the land, with varying degrees of beautiful and ugly installations, the open neutral problem has only really come to the fore now. That and of course some of those half century old cables are rather past their prime...

    Mike.

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  • in reply to AJJewsbury

    Very true, and there are other factors, the  ground may be dry, especially in a concrete or tarmac pavement,  but also the lamp load is physically small, and folk have no need to touch the thing- which is not true for cars which have handles especially for the purpose ;-)  I agree lamp post  earthing is not always going to be sub kilo-ohm, but often it will be, and my point was more that in the car case, every single one of these fortuitous safety factors is absent -  the stars are all wrong for the EV case. For other things such an unlucky alignment is less likely. Which is perhaps why after half a century of PME installed up and down the land, with varying degrees of beautiful and ugly installations, the open neutral problem has only really come to the fore now. That and of course some of those half century old cables are rather past their prime...

    Mike.

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