Hot Ballast

Hi guys Im running a 600w hps and am a bit worried about the ballast, it seems to be getting really hot. Its too almost to touch when its been running a few hours. This is my first grow using a HPS so im not sure if this is normal or if my house is going to burn down while i sleep? The plants sure seem to like it though Is this normal?

i Think it is. I have a 600w electronic galaxy ballast and it runs pretty hot, but i think they are suppose to. Myne on my concrete ground and nothing is touching it at all so im not worried. So yea think its straight

Thanks for the advice man...ill sleep easier now