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O PEN devices on circuits with TN-CS supplies

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 surely the disconnection of the CPC and bonding conductors is requirement in the event of this fault occurring. Any Thoughts ?