APPARATUS FOR DETECTING AN ELECTRICAL CONNECTION

An apparatus for detecting a plug-in connection has first, second and third electrical conductors, a first measuring arrangement, and a charging connection. The charging connection enables connection to a single-phase power grid to connect the first active conductor to the first electrical conductor, the second active conductor to the second electrical conductor, and the third electrical conductor to the protective conductor. The first measuring arrangement has an AC voltage source, a first measuring apparatus, and an evaluating apparatus. The AC voltage source applies a first AC voltage having at least a first frequency between the first and third conductors to generate a first AC current. The first measuring apparatus generates a first signal characterizing the first AC current caused by the first AC voltage. The evaluating apparatus evaluates the first signal to decide which plug-in connection the charging connection is connected to for charging.