I've seen some panels with large bare lugs sticking out the bottom. Sometimes I tape over these. But there should be a plastic cover provided for safety reasons.
I just installed a SquareD panel and it had attachment points for nylon TyRaps so you can secure your bundle of wires or even hold down the big cables so they don't spring out all over the blace like a busted gut. This is a good innovation.
My biggest point is that the covers should be secured with studs instead of screws. That way, the studs will support the weight of the cover until you get the nuts on instead of trying to hold the heavy cover in place while using your second hand to line up the screw and your third hand to manipulate the screwdriver/gun. Siemans has the worst panels. They use those obsolete slotted screws. Also they use about six quick nuts. You get five of them started and then you hear a clunk as the last falls out of its hole and into the innards of the panel so you have to start all over.
~Peter
