2.10.1 Guarding of Equipment
In machinery spaces, machine rooms, control spaces, and control rooms, the following shall be guarded to protect against accidental contact:
(a) driving-machine sheaves and ropes whose vertical projection upon a horizontal plane extends beyond the base of the machine, unless the driving-machine sheave is located to minimize the possibility of contact
(c) exposed gears, sprockets, tape or rope sheaves, or drums of selectors, floor controllers, or signal machines, and their driving ropes, chains, or tapes
(d) keys, keyways, and screws in projecting shafts Hand-winding wheels and flywheels that are not guarded shall have yellow markings.