Watt Doctor-

To be more specific we must provide two 240 volt, 50 amp "pigtails" for sound system Technicians to plug their equipment in. One will be placed at each end of a very large State Park. We simply connect the 50 amp cable to the 50 breaker in the panelboard. We leave approx. 10 feet of cable coiled up with a female cord end on it for the sound Technicians to plug into the day of the event. We have been doing this for years without GFCI protection.
Frank