A great tool for electrical engineers and electricians.This app will calculate:The voltage/percent drop for a wireMinimum wire size for a given percent dropMax wire length for a given percent dropMax amps for a given percent dropThe impedance of the wire based on the inputted valuesClick on the green "Voltage" label for custom voltages.Where length is inputted you can use your GPS from your phone to get an approximate distance (only as accurate as the GPS in your phone).Email the answers to others.Uses the 2008/2011 NEC values for impedanceGet Box/Conduit fill, Fault and Wire Ampacity calculations with Electrical Pro!