It is technically possible to extend mobile EV charging cables that plug into a standard household socket, but this is strongly discouraged for safety reasons. Extension cables are often not designed to handle the continuous high currents required for EV charging—typically between 10A and 16A. Using an unsuitable extension lead increases the risk of overheating, cable damage, or even fire, especially when charging over several hours. The connectors and wiring of most standard extension cords are simply not built for this kind of prolonged electrical load.
If you do choose to use an extension cable, it’s essential to use a high-quality outdoor-rated extension lead with a minimum conductor thickness of 1.5 mm²—ideally 2.5 mm²—for safe current handling. The extension cable should be properly grounded and have a high IP rating, such as IP44 or higher, to protect against moisture, dust, and other environmental hazards. A rugged, heat-resistant cable housing is also important to reduce the risk of electrical faults or insulation failure.
Still, even with the best extension cord, charging performance and safety can be compromised. That’s why Voldt® recommends selecting a mobile charger with the correct cable length from the outset. Our mobile charging cables are available in lengths up to 20 metres and are specifically engineered to handle EV charging loads safely—without relying on third-party extensions. This ensures maximum safety, full compliance with CE and TÜV certifications, and peace of mind while charging.
