i think the "having a grounded type plug" would be a good thing in the long run, in case you had to plug in an extension cord, and just had the standard 3 prong available at the time. I'm thinking of attaching all my grounds together inside the Enclosure as a just to be safe, in case for some reason i power some type of light, or spotlight, or something that has a three prong plug. that way i dont have to look for adapters.