A cable for connecting to a connector of a high-voltage device includes an integral yield sensor. The yield sensor may be a pressure or force sensor, or a displacement sensor, including a stator part and a mobile part, and a spring for maintaining a compression force on the end portion of the cable towards the connector of the high-voltage device. The displacement sensor can include a Hall effect sensor and a linear array of magnetic elements arranged such that the Hall effect sensor moves relative to the linear array if there is any movement between the stator and mobile parts of the sensor, The magnetic field readings are interpreted in order to determine the amount of movement. A system for controlling a high voltage device in response to pressure and other information received from sensors in the cable is also provided.