Helpful video reference. We reference "Tesla Wall Connector Gen 3 UK installation" as the video reference for this guide. It covers the UK-specific installation steps correctly, including the 32A RCBO requirement and the cable sizing that UK building regulations require for this circuit.
1. Check your consumer unit has space
Open the consumer unit door and count the spare ways. You need one free 32A way (or a way that can be freed by moving circuits). The board must be suitable for a Type A RCBO, which means a modern dual-RCD or RCBO board. If you have an older rewireable fuse box or a board with no RCD protection at all, a consumer unit upgrade is likely required before the charger can be installed safely and legally.
Also check the earthing arrangement. If your supply is TN-C-S (PME), the Installation Requirements for Electric Vehicle Charging Equipment (PAS 63100) require open PEN fault protection, either built into the charger (the Wall Connector Gen 3 has this) or installed separately. Confirm with your electrician which arrangement your supply uses.
2. Choose the install position and plan the cable route
The Wall Connector should be mounted at a height that places the cable outlet around waist height when plugged into the car. Most people mount it on a garage wall or external house wall near where the car parks. Measure the cable length required from the consumer unit to the charger and add 20% for routing.
Plan the route to minimise the length of external cable run. Where cable must run externally, use 6 mm² steel wire armoured (SWA) cable with appropriate weatherproof terminations at both ends. Internal runs can use 6 mm² twin-and-earth in conduit or clipped direct.
3. Run the 6 mm² cable
6 mm² is the standard cable size for a 32A EV charger circuit up to approximately 40 metres. For longer runs, check the voltage drop calculation under BS 7671 Appendix 4: you may need to upsize to 10 mm².
Clip the cable at regular intervals. Where it passes through walls, use a suitable grommet or bushings to protect the sheath. Where it enters the consumer unit, use a cable gland. Ensure the cable is clearly labelled at both ends with a durable marker: "EV Charger 32A".
4. Fit the 32A Type A RCBO in the consumer unit
With the main isolator switched off and confirmed dead, fit the 32A Type A RCBO into the spare way. A Type A device responds to both AC and pulsed DC fault currents. Do not substitute a Type AC RCBO: the Wall Connector's onboard charging electronics can produce DC fault components that a Type AC device cannot reliably detect, leaving the circuit without adequate fault protection.
Terminate the supply cable live (brown) and neutral (blue) to the RCBO, and the earth (green/yellow) to the earth bar. Tighten all terminations to the torque specified in the consumer unit manufacturer's instructions.
5. Mount the Wall Connector and make connections
Fix the mounting plate to the wall using suitable fixings for the substrate. Feed the supply cable through the cable entry point at the base of the unit. Connect live, neutral and earth to the terminal block inside the Wall Connector as shown in the installation guide. The earth must be connected before live and neutral: connect earth last when disconnecting.
Ensure the cable is not under tension inside the unit: leave a service loop of at least 100 mm. Fit the wall connector body onto the mounting plate and secure with the retention screw.
6. Commission via the Tesla app
Restore power at the consumer unit. The Wall Connector will perform a self-test sequence (LED patterns indicate the stages). Open the Tesla app on a smartphone, go to Charging, and add a new home charger. Follow the in-app pairing process to connect the charger to your Wi-Fi network and your Tesla account.
Once paired, the app allows you to set the maximum charge current (reduce this if your supply is limited), configure a charge schedule to take advantage of off-peak tariffs, and monitor charge sessions. Test with the car: connect the cable and confirm the charging session starts correctly.
7. Complete Part P notification and obtain your EIC
The installing electrician must notify the installation to the relevant building control body under Part P of the Building Regulations and issue an Electrical Installation Certificate (EIC). You should receive a copy of the EIC within 30 days of completion. Keep it: it is required if you sell the property and useful for any future electrical inspection. Without the EIC the installation has not been completed legally.
When to call us
This is not a DIY job. Even if you are comfortable with basic electrical work, a home EV charger installation is notifiable under Part P and requires an EIC from a registered electrician. Call Richard for a survey and fixed quote covering the full installation and certification.
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Richard installs Tesla Wall Connectors and other home EV chargers across east Kent. Survey, install and Part P certification included.
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