Section R. 408.10575a - Suspended equipmentRule 575a.
(1) Each suspended unit component, except for suspension ropes and guardrail systems, shall be capable of supporting not less than 4 times the maximum intended live load applied or transmitted to that component.(2) Each suspended unit component shall be constructed of materials that will withstand anticipated weather conditions.(3) Each suspended unit shall be provided with a load rating plate that is conspicuously located and that states the unit weight and rated load of the suspended unit.(4) When the suspension points on a suspended unit are not at the unit ends, the unit shall be capable of remaining continuously stable under all conditions of use and position of the live load and shall maintain not less than a 1.5 to 1 stability factor against unit upset.(5) Guide rollers, guide shoes, or building face rollers shall be provided and shall compensate for variations in building dimensions and for minor horizontal out-of-level variations of each suspended unit.(6) Each working platform of a suspended unit shall be secured to the building facade by 1 or more of the following methods or by an equivalent method that is in compliance with the provisions of R 408.10561 and R 408.10562: (c) Button guide engagement.(e) Building face rollers.(7) Each working platform of a suspended unit shall be provided with a guardrail system on all sides, which shall meet the requirements of General Industry Safety and Health Standard Part 2 "Walking-Working Surfaces," as referenced in R 408.10509. All of the following provisions apply to the guardrail system: (a) The system shall consist of a top guardrail, midrail, and toeboard.(b) The top guardrail shall be not less than 42 inches high and shall be able to withstand not less than a 200-pound force in any downward or outward direction.(c) The midrail shall be able to withstand not less than a 75-pound (333 n) force in any direction.(d) The areas between the guardrail and toeboard on the ends and outboard side, and the area between the midrail and toeboard on the inboard side, shall be closed with a material that is capable of withstanding a load of 100 pounds (45.4 kg.) applied horizontally over any area of 1 square foot (.09 m2). All openings in the material shall be small enough to prevent the passage of lifelines and potential falling objects that may be hazardous to persons below.(e) Toeboards shall be capable of withstanding a force of not less than 50 pounds (222 n) applied in any direction at any point along the toeboard.(f) Toeboards shall be not less than 4 inches in height from the top edge to the level of the platform floor.(g) Toeboards shall be securely fastened in place at the outermost edge of the platform and have not more than 1/4 of an inch (1.3 cm) clearance above the platform.(h) Toeboards shall be solid or have an opening that is not more than 1 inch (2.5 cm) in the greatest dimension.Mich. Admin. Code R. 408.10575a
2016 AACS; 2018 MR 3, Eff. 2/20/2018