an apparatus for measuring voltage in a broadband over power line system including a first load having a first predetermined impedance , and a second load having a second predetermined impedance . wherein the apparatus is contained within a capacitor - based bpl coupler . also a method of measuring a voltage and a phase angle in a broadband over power line system comprising attaching a voltage divider to a medium voltage power line , measuring a voltage and a phase angle at said voltage divider and calculating said voltage and the phase angle based on the measured voltage and the measured phase angle . wherein the voltage divider may be placed within a coupler along the broadband over power line system .