Systems and methods for measuring AC voltage of an insulated conductor are provided, without requiring a galvanic connection between the conductor and a test electrode or probe. A non-galvanic contact (or “non-contact”) voltage measurement system includes a sensor subsystem, an internal ground guard and a reference shield. A common mode reference voltage source is electrically coupled between the internal ground guard and the reference shield to generate an AC reference voltage which causes a reference current to pass through the conductive sensor. Control circuitry receives a signal indicative of current flowing through the sensor subsystem due to the AC reference voltage and the AC voltage in the insulated conductor, and determines the AC voltage in the insulated conductor based at least in part on the received signal. The sensor subsystem includes at least two independent sensors that are used to compensate for conductor position while improving accuracy and dynamic range.