R 408.10562 Intermittent stabilization systems.

Rule 562. (1) An intermittent stabilization system shall keep equipment in continuous contact with the building facade and shall prevent sudden horizontal movement of the platform. The system may be used together with continuous positive building guide systems that use tie-in guides on the same building if the requirements for each system are met. (2) The maximum vertical interval between building anchors shall be 3 floors or 50 feet (15.3 m), whichever is less. (3) Building anchors shall be located vertically so that attachments of the stabilizer ties will not cause the platform suspension ropes to angulate the platform horizontally across the face of the building. The anchors shall be positioned horizontally on the building face so as to be symmetrical about the platform suspension ropes. (4) Building anchors shall be visible to employees and shall allow a stabilizer tie attachment for each of the platform suspension ropes at each vertical interval. If more than 2 suspension ropes are used on a platform, only the 2 building-side suspension ropes at the platform ends shall require a stabilizer attachment. (5) Building anchors that extend beyond the face of the building shall be free of sharp edges or points. Where cables, suspension wire ropes, and lifelines may be in contact with the building face, external building anchors shall not interfere with their handling or operation. (6) The intermittent stabilization system building anchors and components shall be capable of sustaining, without failure, not less than 4 times the maximum anticipated load applied or transmitted to the components and anchors. If 2 anchors share the wind load, the minimum design wind load for each anchor shall be 300 pounds (1334 n). (7) The building anchors and stabilizer ties shall be capable of sustaining anticipated horizontal and vertical loads from winds specified for roof storage design which may act on the platform and wire ropes if the platform is stranded on a building face. If the building anchors have different spacing than the suspension wire rope or if the building requires different suspension spacings on 1 platform, 1 building anchor and stabilizer tie shall be capable of sustaining the wind loads. (8) A powered platform shall be suspended by 2 or more cables. Where 2 cables are used, each employee on the work platform shall use a safety harness and lanyard that is attached to an individual lifeline. The lifeline shall be secured to the building structure and shall be independent of any cable and structures that support the powered platform. (9) When normal voice communication cannot be understood, a powered platform shall be equipped with a 2-way voice communication system between the operator and persons who are stationed at a supervised location in the vicinity or within the building being serviced. The communication system shall be operative and shall be tended at all times. (10) Where thrustouts are used in place of a roof car, they shall be anchored to the building structure with fasteners that are capable of sustaining the imposed load.