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 several factors, including the distance between the charging station and the electrical connection, the installation environment, and the specific requirements of the charging station manufacturer.

In most cases, a 5-core ground cable with a cross-section ranging from 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 power grid.

However, it is important to mention that the exact specifications and regulations may 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 to perform the installation correctly and safely.