Wire Conductor Chart June 29, 2019 What is wire ampacity and how do you find ampacity rating?. When selecting a cable, one must know its wire ampacity rating. This rating has been determined by the NEC (National Electrical Code).. www.wireandcabletips.com Three Color CableTrailer Hook Up ElectricalInstalling A Honeywell Thermostat InstructionsHow To Install Transformer For Landscape LightingTrailer Wiring Plugs And SocketsElectrical Ground Wire SizeHoneywell Thermostat Wiring For AcKia Spectra Wiring Diagram