R 408.41478 Additional requirements for personnel hoists.

Rule 1478. (1) A personnel hoist shall be used to raise or lower an employee in a tunnel shaft or caisson. A crane may be used to raise or lower an employee, if the crane and the work platform are as prescribed in Construction Safety and Health Standard Part 10. “Cranes and Derricks,” as referenced in R 408.41410. The hoist shall comply with 1967 PA 227, MCL 408.801 to 408.824, and the elevator safety rules of the Bureau of Construction Codes, Elevator Safety Board, R 408.7001 to R 408.8695. (2) All sides of personnel cages shall be enclosed by 1/2-inch (12.70 mm) wire mesh, at least no. 14 gauge or its equivalent, to a height of at least 6 feet (1.83 m). When the cage or skip is being used as a work platform, its sides may be reduced in height to 42 inches (1.07 m) when the conveyance is not in motion. All personnel cages shall be provided with a positive-locking door that only opens inward. (3) Flammable or combustible liquids or gases shall not be permitted on the work platform if the platform is occupied by an employee or employees. (4) Hoist drum systems shall be equipped with at least 2 means of stopping the load, each of which shall be capable of stopping and holding 150 % of the hoist’s rated line pull. A broken-rope safety, safety catch, or arrestment device is not a permissible means of stopping. (5) The operator shall remain within sight and sound of the signals at the operator’s station. (6) All personnel cages shall be provided with a protective canopy. The canopy shall be made of steel plate, at least 3/16-inch (4.763 mm) in thickness, or material of equivalent strength and impact resistance. The canopy shall be sloped to the outside, and so designed that a section may be readily pushed upward to afford emergency egress. The canopy shall cover the top in such a manner as to protect those inside from objects falling in the shaft. (7) Personnel platforms operating on guide rails or guide ropes shall be equipped with broken-rope safety devices, safety catches or arrestment devices that will stop and hold 150 % of the weight of the personnel platform and its maximum rates load. (8) During sinking operations in shafts where guides and safeties are not yet used, the travel speed of the personnel platform shall not exceed 200 feet (60.96 m) per minute. Governor controls set for 200 feet (60.96 m) per minute shall be installed in the control system and shall be used during personnel hoisting. (9) The personnel platform may travel over the controlled length of the hoistway at rated speeds up to 600 feet (182.88 m) per minute during sinking operations in shafts where guides and safeties are used. (10) The personnel platform may travel at rated speeds greater than 600 feet (182.88m) per minute in completed shafts.