For an 11 kW charging station, a ground cable with a suitable cross-section is generally recommended to safely transport the required power. The right choice of ground cable depends on various factors, including the distance between the charging station and the electrical connection, the installation environment, and the specific requirements of the manufacturer of the charging station.

In most cases, a 5-core ground cable with a cross-section of 6 mm² to 10 mm² is recommended for an 11 kW charging station. These cables are suitable for both single-phase and three-phase connections, depending on the type of charging station and the configuration of the electricity grid.

However, it is important to mention that the exact specifications and regulations can vary depending on local regulations and specific installation requirements. Therefore, it is advisable to consult a professional electrician who has experience with installing charging stations to select the right ground cable and perform the installation correctly and safely.