The IEC line of plugs and connectors are made with a rugged super tough, one piece housing. The thermoset polyester contact carrier provides a high resistance to electrical tracking. They withstand higher temperatures which may result from overload or arcing. The heavy duty, external cord grip provides superior strain relief on the conductors. Hubbell® horsepower rated plugs and receptacles meet NEC 430.109(F) requirements and recognizes as an approved disconnecting/line of sight disconnecting means.