Dj1209
Well-Known Member
Hello I was just wondering if any one out there knows whether I need the third round prong to be plugged in. I was running all of my cfls off a 120v timer but it was just the two rectangle slots and today when I went to put my 400w hps in I noticed that if I plug it in that other round pin would not be plugged into anything I think its just the ground but am unsure does it have to be in. I must know soon because I can't run it wig a risk of fire or something worse.