Abstract: A medical system comprising an internal unit; a transformer core; internal cabling comprising an internal winding around the transformer core; and an external unit comprising power supply circuitry and external cabling coupled to the power supply circuitry for enabling supply of power from the power supply circuitry to the internal unit via the transformer core. The external cabling comprises a connector including a first connector part and a second connector part; a first conductive current path between the power supply circuitry and the first connector part; a second conductive current path between the power supply circuitry and the second connector part; and a third conductive current path between the first connector part and the second connector part, conductively connecting the first connector part and the second connector part.