My question concerns the use of a single dedicated receptacle vs a GFI receptacle to power a 120vac sump pump. The sump pumps are located in two different environments. The first being a boiler room with concrete floors and walls. The floors are damp and certain times of the year are wet in areas. The second location is in a building crawl space with dirt floors. Is it mandatory to plug these sump pumps into a GFI receptacle or can I use a single receptacle? If allowed to use a single receptacle should the plug on the end of the pump be changed to a twist lock to insure no one could plug into it?