A system to measure alternating current, AC, voltage in an insulated conductor comprising a conductor and an insulator surrounding the conductor, the system comprising: a housing; a sensor assembly physically coupled to the housing; a voltage measurement subsystem; and at least one processor communicatively coupled to the voltage measurement subsystem, the system characterized in that: the sensor assembly is selectively positionable proximate the insulated conductor without galvanically contacting the conductor, the sensor assembly comprises a first electrode (S 1), a second electrode (S 2), and a third electrode (S 3), and the first (S 1), second (S 2) and third (S 3) electrodes each capacitively couple with the insulated conductor when the sensor assembly is positioned proximate the insulated conductor, wherein each of the electrodes (S 1, S 2, S 3) capacitively couples with the conductor of the insulated conductor forming respective sensor coupling capacitors (C 1, C 2, C 3), and each of the first (C 1), second (C 2) and third (C 3) sensor coupling capacitors differs from the other of the sensor coupling capacitors (C 1, C 2, C 3) with respect to at least one physical dimension that affects the capacitive coupling; the voltage measurement subsystem being electrically coupled to the first (S 1), second (S 2) and third (S 3) electrodes, the voltage measurement subsystem (102 is configured to generate first, second and third sensor voltage signals that are indicative of voltages at the first (S 1), second (S 2) and third (S 3) electrodes, respectively; and the at least one processor is, in operation, configured to: receive the first, second and third sensor voltage signals from the voltage measurement subsystem; and determine the AC voltage in the insulated conductor based at least in part on the received first, second and third sensor voltage signals. a housing; a sensor assembly physically coupled to the housing; a voltage measurement subsystem; and at least one processor communicatively coupled to the voltage measurement subsystem, the system characterized in that: the sensor assembly is selectively positionable proximate the insulated conductor without galvanically contacting the conductor, the sensor assembly comprises a first electrode (S 1), a second electrode (S 2), and a third electrode (S 3), and the first (S 1), second (S 2) and third (S 3) electrodes each capacitively couple with the insulated conductor when the sensor assembly is positioned proximate the insulated conductor, wherein each of the electrodes (S 1, S 2, S 3) capacitively couples with the conductor of the insulated conductor forming respective sensor coupling capacitors (C 1, C 2, C 3), and each of the first (C 1), second (C 2) and third (C 3) sensor coupling capacitors differs from the other of the sensor coupling capacitors (C 1, C 2, C 3) with respect to at least one physical dimension that affects the capacitive coupling; the voltage measurement subsystem being electrically coupled to the first (S 1), second (S 2) and third (S 3) electrodes, the voltage measurement subsystem (102 is configured to generate first, second and third sensor voltage signals that are indicative of voltages at the first (S 1), second (S 2) and third (S 3) electrodes, respectively; and the at least one processor is, in operation, configured to: receive the first, second and third sensor voltage signals from the voltage measurement subsystem; and determine the AC voltage in the insulated conductor based at least in part on the received first, second and third sensor voltage signals. the sensor assembly is selectively positionable proximate the insulated conductor without galvanically contacting the conductor, the sensor assembly comprises a first electrode (S 1), a second electrode (S 2), and a third electrode (S 3), and the first (S 1), second (S 2) and third (S 3) electrodes each capacitively couple with the insulated conductor when the sensor assembly is positioned proximate the insulated conductor, wherein each of the electrodes (S 1, S 2, S 3) capacitively couples with the conductor of the insulated conductor forming respective sensor coupling capacitors (C 1, C 2, C 3), and each of the first (C 1), second (C 2) and third (C 3) sensor coupling capacitors differs from the other of the sensor coupling capacitors (C 1, C 2, C 3) with respect to at least one physical dimension that affects the capacitive coupling; the voltage measurement subsystem being electrically coupled to the first (S 1), second (S 2) and third (S 3) electrodes, the voltage measurement subsystem (102 is configured to generate first, second and third sensor voltage signals that are indicative of voltages at the first (S 1), second (S 2) and third (S 3) electrodes, respectively; and the at least one processor is, in operation, configured to: receive the first, second and third sensor voltage signals from the voltage measurement subsystem; and determine the AC voltage in the insulated conductor based at least in part on the received first, second and third sensor voltage signals. receive the first, second and third sensor voltage signals from the voltage measurement subsystem; and determine the AC voltage in the insulated conductor based at least in part on the received first, second and third sensor voltage signals.