Grainger offers a NEMA grade, portable GFCI plug. This GFCI extension cord has a ground fault circuit breaker that diverts power when an overload current is detected. The GFCI cord prevents dangerous high voltage electrical shocks from water and other hazards. It is useful when a standard GFCI receptacle is not available. Ideal for the job site, or mechanic's garage, just attach the GFCI plug to your retractable cord or an existing extension cord set to protect yourself and your employees.