Michigan Administrative Code › Department - Labor and Economic Opportunity › MIOSHA › General Industry and Construction Safety and Occupational Health Standards › Construction Safety and Health Standard › Part 14 - TUNNELS, SHAFTS, CAISSONS, AND COFFERDAMS › TUNNELS AND SHAFTS › Section R. 408.41478 - Additional requirements for personnel hoists

Current through Vol. 24-12, July 15, 2024
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 hoists 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
						operators 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.