What are the rules about using planks for working less than 4 ft above the floor? I've made a bracket ass'y. to hook over the walls of system furniture of office spaces, and use a 2x10 plank attached to the bracket, and the other end supported by a step ladder. This allows access to light fixtures that are over the walls and intersections of system furniture. I haven't tried to let an OSHA compliance officer check it out yet, and am wondering if my setup will be allowed. I've been told that as long as I am less than 4 ft up, that I don't need handrails for my plank/scaffold. Anyone got experience in this sort of scenario, so as to help me fine tune my setup?