R 408.10572 Working platforms.

Rule 572. A working platform that is used on the exterior of a building shall be equipped with rollers which will be in contact with the building face. Where the vertical working travel of a working platform is more than 130 feet, the platform shall be equipped with guide rollers or guide shoes which shall positively engage guides, such as "t" rails or indented mullions. The guide rollers or guide shoes shall enter the guides at the lowest possible speed and shall not require any manual assistance from an employee while the work platform is in motion. A working platform that is installed before the effective date of this standard and that has a rise of more than 130 feet may use an equivalent means to tie the platform to the building instead of guide rollers or guide shoes.