Sometimes, yes, but only if that consumer unit has enough spare capacity, the right protective devices, and an earthing arrangement your installer can certify for EV charging. Many garage units were fitted to run lights and a couple of sockets, not a 32 A continuous load for hours at a time. In practice, installers often fit a separate dedicated unit for the charger instead.
Key Takeaways
- A garage consumer unit can feed a charger only if capacity, protection and earthing all check out.
- Many garage units were never designed for a 32 A continuous load.
- A separate dedicated unit is a common and legitimate outcome, not a sales trick.
- The survey decides; do not open the unit or add the circuit yourself.
What Your Installer Checks First
It is a judgement call made at survey. These are the checks that decide it:
- Spare capacity. A 7.4 kW single-phase charger draws about 32 A continuously. The unit needs a spare way, and the cable and protective device feeding the garage must be rated for the charger plus the existing garage loads.
- Protective devices. EV charging needs protection that responds to DC residual currents as well as AC faults. Many chargers include 6 mA DC detection; where they do not, the board must provide a suitable device. Your installer selects the arrangement.
- Earthing and PEN protection. If the house supply uses a PME earthing arrangement, the installation must deal with a broken PEN conductor fault: through the charger’s built-in open-PEN protection, an earth electrode, or another method the wiring rules allow.
- Cable run and condition. Distance, voltage drop, and the age and state of the existing unit all count. A corroded or unlabelled board is a warning sign, not a starting point.
The IET’s Code of Practice for EV charging installations is the document installers work to in the UK, and our wallbox installation guide walks through the wider job these checks belong to.
When the Answer Is No
| What the survey finds | Likely outcome |
|---|---|
| Garage unit fed by a small cable or a low-rated protective device | The charger is fed from a separate dedicated unit at the main board, or the garage feed is upgraded first. |
| No spare ways in the garage unit | A small dedicated consumer unit is fitted for the charger alone. |
| Earthing arrangement cannot be confirmed as suitable | An earth electrode, or a charger with built-in open-PEN protection, forms part of the design. |
| Old unit with no suitable fault protection | The unit is replaced or upgraded as part of the same job. |
None of this is DIY territory. Do not open a consumer unit or add a circuit yourself: the survey, the design and the testing are the installer’s job, and a charger connected to an unsuitable board is a fault waiting for a heavy load to find it. What counts as a standard EV charger installation gives a fair picture of the work involved.
Notifications and Paperwork
In the UK, most charge point installations must be notified to the distribution network operator (DNO), the company that runs the local grid. Your installer normally submits the form, alongside the earthing confirmation, and you receive the electrical certificate for the work. It is another reason the question is settled by a professional visit, not a photo of your board.
A Charger Suited to Either Route
Whichever way the supply is arranged, the charger itself is specified the same way: matched to the supply and the car. The EV-ACT3204PE is a 22 kW wallbox for three-phase supplies, with a a tethered Type 2 cable, RFID and app control, an IP66 enclosure and CE marking. Your installer confirms the rating your supply can actually feed before anything is ordered.
Frequently Asked Questions
Can I run a portable charger from a garage socket instead?
A socket-fed portable charger is fine for occasional charging, but a domestic socket is not designed for full-rate charging every night, year after year. For daily charging, a dedicated charge point on its own circuit is the recommended route.
Does a separate consumer unit add a lot to the cost?
It depends on the cable run and the state of the existing board, so get an itemised quote. Where the garage unit is unsuitable, a small dedicated unit is usually simpler than reworking the old board.
How do I know if my supply is PME?
Most householders cannot tell from looking. Your installer identifies the earthing arrangement during the survey and designs the PEN protection around it. That check is part of the job, not an extra.
Related Reading
- Wallbox Home Charger Installation Guide 2026
- What Is a Standard EV Charger Installation?
- Are Home EV Chargers Safe?
- Can I Install a Level 2 Charger Myself?
