Wiring Regulations BS7671

Section 722 Electric Vehicle Charging Installations

A look at the specific regulations covering charging installations for electric vehicles. Specifically the earthing arrangements that can be used and the type of RCD that is required.

BS7671:2018 Section 722 EV Charging

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The main point regarding earthing is that TN-C-S cannot be used for EV charging equipment unless one of three specific items is met. Unfortunately those three items are next to impossible in reality, and the only realistic option is to use a separate earth electrode as a TT system, not connecting to the TN-C-S earth at all.