well to me that ballast is unlike one i have ever seen, but it should have either a plug in to another socket thing with the other end of that having an open white, black and green(ground) cables although i am inexperienced with 400s, they may not have grounds. Either way you take the black/whites and hook it to your socket (might be labelled but usually you can put either one on either one) now the plug im talking about is a small cable coming from the female end(not the AC side) and just plugs into the socket cord, or it may not (i know im really high right now and explaining is hard sorry bro) and then after you have connected the black/white wires into the socket and tightened the screws/clamps whatever your model has, and then depending if it has a ground just grounding it to metal, although i know alot of people who leave the ground untouched. Anyways man i know im really really hard to understand but i hope i could help you dude. From the looks of the diagram on the case it shouldnt need a ground, anyways diude good luck and hope i could help with my stoned ass.