Not always, but often. In the UK, the supply cable from the consumer unit to a charge point must be protected against mechanical damage suitable to its route. Steel wire armoured (SWA) cable is common for external runs, buried runs and routes along driveways because the armour provides both mechanical protection and, in many designs, a protective earth path. Inside a building, standard cable in walls or in conduit may be sufficient. The installer decides based on BS 7671 and the IET Code of Practice for EV charging equipment installation.
Typical Choices
| Route | Common cable choice |
|---|---|
| Inside garage, short run | Twin and earth in conduit or trunking |
| External wall, exposed to impact | SWA or cable in protective conduit |
| Buried to driveway pedestal | SWA at suitable depth, with marker tape |
Other UK Requirements to Know
- Earthing: many UK homes use a PME (TN-C-S) supply, which needs PEN fault protection or a separate earth arrangement for EV charging; see PEN fault protection.
- RCD: 30 mA protection with DC fault handling; see RCD protection for EV chargers.
- Smart charging: home charge points must meet the 2021 Smart Charge Points Regulations.
- Notification: the installation is notifiable building work, normally certified by a registered electrician.
Charger Hardware
Wallboxes such as the EVDANCE EV-ACT3204E 22 kW wallbox are hard-wired and mounted outdoors with IP65/IP66 protection; the supply cable choice depends on the route. Ask your installer to explain the cable and earthing design.
Frequently Asked Questions
Is SWA cable required for EV chargers?
Not always; it depends on the route and protection needed.
Can I use twin and earth outside?
Not unprotected; it needs suitable conduit or a different cable type.
Does the armour act as the earth?
In many designs it can, if properly terminated and sized.
Related Reading
- Does the Tesla Wall Connector Have PEN Protection?
- RCD Protection for EV Chargers
- How to Hide and Manage an EV Charger Cable
Key Takeaways
- SWA is common for external and buried charge point supplies.
- Indoors, protected standard cable may be enough.
- Earthing, RCD and smart-charging rules also apply in the UK.