Driving Safety: Signals, Signs and Pavement Markings II Questions taken from the PA Drivers' Manual Progress Indicator: Question 2 of 27 2.  Medium Voltage is defined as: Choices: Voltage from 600 to 1,000 volts Voltage from 661 to 1,000 volts Voltage from 551 to 1,000 volts Voltage from 676 to 1,000 volts