This looks like a power cord that would be used for a welder that can run on 120 or 240v usually at about half the capacity when at 1/2 the voltage Edit: never

This looks like a power cord that would be used for a welder that can run on 120 or 240v usually at about half the capacity when at 1/2 the voltage Edit: nevermind since it was pointed out that this is only a 120v appliance end