![]() ensure adequate separation distances below ground, between exposed-conductive-parts connected to different earthing arrangements.understand the risks associated with driving electrodes.determine when it is unsafe to employ a TT earthing arrangement in installations with TN supply earthing arrangements.New and extended guidance is now included, to help designers and installers: Further, this approach may not offer any benefit at all in small curtilage properties, such as a common semi-detached dwelling. Unsafe installation practices have been observed where a separate TT supply is used for electric vehicle charging equipment. Updated guidance on deriving a TT earthing arrangement from a TN supply ![]() This method is described fully in Annex J of the IET Code of Practice for EV Charging Equipment Installation 4 th Edition.
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