(a) Driving machines shall be of the traction, drum, screw, or rack and pinion type. The installation of belt-drive and chain-drive machines is prohibited. [1502.10a]
- (1) Screw machines shall conform to the requirements of Section 3088.
- (2) The rack and pinion drive shall consist of one or more power-driven rotating pinions mounted on the car and arranged to travel on a stationary vertical rack mounted in the hoistway. The drive shall have at least one pinion, one rack, and two backup rollers. The pinion and rack shall be of steel with a minimum safety factor of eight for the pinion and the rack. Driving machines located within the car shall be fully enclosed with solid or openwork metal which shall reject a ball ½ in. (13 mm) in diameter and which shall be locked.
(b) Winding drums, traction sheaves and overhead and deflecting sheaves shall be of cast iron or steel and of a pitch diameter or not less than 30 times the diameter of the wire suspension ropes. The rope grooves shall be machined. [1502.10b]
Exception to subsection 3085.20(b): Where 8 x 19 steel ropes are used on a drum type machine installation, the pitch diameter of drums and sheaves may be reduced to 21 times the diameter of the rope.
- (c) The factor of safety for driving machines and sheaves shall conform to the requirements of subsection 3038(c). [1502.10c]
- (d) Bolts transmitting torque and set screws shall conform to the requirements of subsection 3038(d). [1502.10d]
- (e) Friction-gearing or clutch mechanisms shall not be used for connecting the drum or sheaves to the main driving mechanism. [1502.10e]
- (f) Worms and worm gears made of cast iron shall not be used. [1502.10f]
- (g) Driving machines shall be equipped with brakes meeting the requirements of subsection 3038(h). [1502.10g]
- (h) A single ground or short circuit, a counter-voltage or a motor field discharge shall not prevent the brake magnet from allowing the brake to set when the operating device is placed in the stop position. [1502.10h]
(i) A permanent, safe and convenient means of access to elevator machine rooms and overhead machinery spaces shall be provided for authorized personnel. [1502.10i]
(Title 24, Part 7, Section 7-3085.20)
Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.