ASME A120.1-2008 pdf free download.Safety Requirements for Powered Platforms and Traveling Ladders and Gantries for Building Maintenance.
registered professional engineer: a person who has been duly registered and licensed by an authority within the United States to practice the profession of engineering.
remedial work: restoration, renovation, or modifications employing crafts associated with the construction industry, such as masonry, glazing, caulking, and carpentry.
remote powered platform and equipment: a powered platform or suspended equipment where the means of raising and lowering the suspended unit is located at an elevation or location other than on the platform or suspended unit.
reverse bend: a reverse bend in a wire rope is one where a rope bends around one sheave followed by bending around a second sheave in the opposite direction.
rope lay length: the length, parallel to the longitudinal axis, in which a wire makes one complete turn about the axis of the strand or a strand about the axis of a rope. In this connection it is also referred to as lay length or pitch.
saft surface: a horizontal surface intended to be occupied by personnel, which is so protected that it can he reasonably assured that said occupants will be protected against injury or from falling.
self-powered platform: a powered platform where the hoist(s) is located on the platform.
single wrap Oaier) drum hoist: a type of winding drum hoist that accumulates the suspension wire rope in a single layer on the surface of the hoisting drum.
speed reducer: a positive-type speed-reducing machine.
stability factor: the ratio of the stabilizing moment to the overturning moment.
strain relief anchor: a positive device used for the mechanical anchorage of cable to prevent undue strain on the cable connectors.
strand: a symmetrically arranged and helically-wound assembly of wires.
sup ported equipinen t: any building maintenance equipment that is held or moved to its working position by means of attachment directly to the building or extensions of the building being maintained.
suspended equipment (suspended scaffold): any building maintenance equipment that is suspended or moved to its working position by means of ropes or combination cables attached to some anchorage above the equipment.
tail line: the nonsupporting end of a suspension wire rope.
(a) The exteriors of all buildings shall be designed with guides to provide a positive and continuous means of engagement between the suspended or supported portion of the equipment and the building during full vertical travel of the suspended or supported unit on the face of the building.
(b) A method shall be provided to separate the guide shoes from the platform without the use of tools, in case of an emergency.
(a) Where the building exterior prohibits the installation of building tie-in-guides at the uppermost elevation of the building, they may be omitted for not more than 50 ft (15 m) of the uppermost elevation. When angulated roping is employed, the allowable unguided distance may be increased to 75 ft (23 m), provided a stabilizing force of at least 10 lb (44.5 N) is maintained under all conditions of loading.
(b) Continuous tie-in-guides may be eliminated on the exterior of buildings where either
(1) the building is provided with an intermittent stabilization system (equipment tie-in-devices) in accordance with para. 220.127.116.11; or
(2) the equipment installation utilizes angulated roping, a stabilizing force of at least 10 lb (4.5 kg) is maintained under all conditions of loading, and only where the rise of the suspended portion of the equipment does not exceed 130 ft (40 m).