I have a question concerning ground fault protection on aerator motors in a lagoon at a water treatment facility. These are 3 phase 480V motors, floating throughout the lagoon, connected via a submersed 4 Wire cord. Of course, no one actually enters the lagoons, but maintenance is often performed by boating out to the motors. GF protection is not required for the equipment. Should (or is it) required for personnel safety? I cannot find any thing to say it is.