Re: NEC Poster's!! Can I see what you look like too?
ctroyp,
No, we do not have to cover the exposed breaker slots when the cover/dead front is removed. The breaker buss is overcurrent protected by the main breaker.
The main lugs are covered in "service" panels because they often have no overcurrent protection except the transformer primary fuse.
Your post reminded me of a time, back in the sixties, when I was pulling feeder runs back into a live 120/208 volt splitter trough, the kind with four bare buss-bars running the full length of the trough.
The electrical room was quite small, we didn't have a fish reel, and my helper was trying to coil up the 100 ft fish, and keep it under control as I pulled.
Well you can probably guess the rest. The "springy" fish got away from him and just about filled the room.
Everybody ducked, and after the smoke cleared, our only 100 ft fish was in about six pieces.
Ed