Michigan Administrative Code › Department - Labor and Economic Opportunity › MIOSHA › General Industry and Construction Safety and Occupational Health Standards › General Industry Safety Standards › Part 5 - POWERED PLATFORMS FOR BUILDING MAINTENANCE › WIRE, FIBER AND SYNTHETIC ROPE › Section R. 408.10577 - Control circuits; power circuits; components

Current through Vol. 24-12, July 15, 2024
Rule 577.
(1)
						Electrical wiring and equipment shall be in compliance with the requirements
						specified in General Industry Safety Standard Part 39 "Design Safety Standards
						for Electrical Systems," as referenced in
						R
						408.10509, except as otherwise required by these
						rules.
(2) An electrical runway
						conductor system shall be of a type that is designed for use in exterior
						locations and shall be located so that the system does not come into contact
						with accumulated snow or water.
(3)
						Cables shall be protected against damage that results from over-tensioning or
						from other causes.
(4) Devices
						shall be included in the control system for the equipment which will provide
						protection against electrical overloads, 3-phase reversal, and phase failure.
						The control system shall have a separate method, which shall be independent of
						the direction control circuit, for breaking the power circuit if there is an
						emergency or malfunction.
(5)
						Suspended or supported equipment shall have a control system that will require
						the operator of the equipment to follow predetermined procedures.
(6) All of the following requirements apply
						to electrical protection devices:
(a) On
						installations where the carriage does not have a stability factor of at least 4
						against overturning, an electrical contact or contacts shall be provided and
						connected so that the operating devices for the suspended or supported
						equipment shall be operative only when the carriage is located and mechanically
						retained at an established operating point.
(b) Overload protection shall be provided in
						the hoisting or suspension system to protect against the equipment operating in
						the "up" direction with a load of more than 125% of the rated load of the
						platform.
(c) An automatic detector
						shall be provided for each suspension point which will interrupt power to all
						hoisting motors for travel in the "down" direction and which will apply the
						primary brakes if any suspension wire rope becomes slack. A continuous-pressure
						rigging-bypass switch that is designed for use during rigging is permitted.
						This switch shall only be used by authorized personnel during
						rigging.
(d) Upper and lower
						directional switches that are designed to prevent the travel of suspended units
						beyond safe upward and downward levels shall be provided.
(e) Emergency stop switches shall be provided
						on remote controlled, roof-powered platforms that are adjacent to each control
						station on the platform.
(f) Cables
						that are in constant tension shall have overload devices which will prevent the
						tension in the cable from interfering with the load-limiting device or with the
						platform roll-limiting device. The setting of these devices shall be
						coordinated with other overload settings at the time the system is designed and
						shall be clearly indicated on or near the device. The device shall interrupt
						the equipment travel in the "down" direction.