If you are talking about wiring into a distribution pannel with bare
wire or camlock connectors, then no you dont have to be a licensed electrician, but it does (at least in maryland) have to be inspected by an electrician. I would highly suggest getting one to do it though... most of those distros are 100 - 200 Amps at 120v... thats a hell of a
shock if you screw up... doing the math thats up to 24,000 watts. a normal electrical
socket only is 2,400 watts. Just a thought.