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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 ?  

Parents

  • a clearer demonstration of PME arcing problems I have not seen

    Impressive! I wonder what's triggering the arc? I'm guessing there's a consistent small gap between conductive parts somewhere - most unusual for plumbing fittings (either metal-to-metal or metal-to-plastic).

       - Andy.

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  • a clearer demonstration of PME arcing problems I have not seen

    Impressive! I wonder what's triggering the arc? I'm guessing there's a consistent small gap between conductive parts somewhere - most unusual for plumbing fittings (either metal-to-metal or metal-to-plastic).

       - Andy.

Children
  • in reply to AJJewsbury

    Well given the hissing and spitting, the dreaded high resistance char I expect. It is quite likely to be some sort of organic jointing compound, perhaps a grease or a putty-like thing between two metal parts, that conducts to a degree, and is heated and pyrolysed to produce something more like a sooty carbon deposit that has a resistance  of several ohms that then heats up and does more burning/ boiling off of any oil or moisture.

    I think it might be a compression type copper to lead transition, and if it is, then something like "plumbers mait" may have been used, but I am only guessing.

    A properly sweated lead to copper soldered joint would probably have been good for half a kA at least with water running in the pipe, but no-one does those any more.

    Mike.

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