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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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  • As far as possible equipment out doors could/should be double insulated, so the CPC, and any problem voltages on it, vanishes, and for hand held things like hedge trimmers it is required by product standards.

    Cars are most a unusual case in being class 1 (earthed metal case), a high current load and easy to touch and without a self earthing construction, (unlike perhaps a lamp post which folk do not normally touch, and is planted in the ground not on rubber tyres )

    So long as we avoid or ignore the live outside tap problem, the only thing that really needs the switched CPC is the car I suggest if you really want to do something to the whole building the correct thing to do is to TT instead.  (and insulating joints on all incoming metallic services.)

    Mike.

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  • As far as possible equipment out doors could/should be double insulated, so the CPC, and any problem voltages on it, vanishes, and for hand held things like hedge trimmers it is required by product standards.

    Cars are most a unusual case in being class 1 (earthed metal case), a high current load and easy to touch and without a self earthing construction, (unlike perhaps a lamp post which folk do not normally touch, and is planted in the ground not on rubber tyres )

    So long as we avoid or ignore the live outside tap problem, the only thing that really needs the switched CPC is the car I suggest if you really want to do something to the whole building the correct thing to do is to TT instead.  (and insulating joints on all incoming metallic services.)

    Mike.

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