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
POWERED PLATFORM INSTALLATIONS - EQUIPMENT
Section R. 408.10566 - Outriggers

(1) Outriggers may be used as a method of suspension for ground-rigged working platforms where the point of suspension is not more than 300 feet (91.5 m) above a safe surface. A tie-in guide system or systems shall be provided and shall be in compliance with the requirements of R 408.10561 and R 408.10562.

(2) Outriggers shall be used only with self-powered, ground-rigged working platforms.

(3) Each outrigger shall be secured with a tie-down to a verified anchorage on the building during the entire period of its use. The anchorage shall be designed to have a stability factor of not less than 4 against overturning or upsetting the outrigger.

(4) Access to and egress from the working platform shall be from and to a safe surface below the point of suspension.

(5) Each portable outrigger shall be designed for lateral stability to prevent rollover if lateral load is accidentally applied to the outrigger.

The accidental lateral load to be considered in this design system shall be not less than 70% of the rated load of the hoist.

(6) Each portable outrigger shall be designed to support a load of not less than 4 times the rated load of the hoist.

(7) Each portable outrigger shall be located so that the suspension wire ropes for 2-point suspended working platforms are hung parallel.

(8) A portable outrigger shall be tied back to a verified anchor on the building with a rope that is equivalent in strength to the suspension rope.

(9) The tie-back rope shall be installed parallel to the centerline of the outrigger.