Abstract： ASME A120.1:2014 pdf download.Safety Requirements for Powered Platforms and Traveling Ladders and Gantries for Building Maintenance. 3.2.7 Height Restriction 3.2.7.1 Buildings with vertical platform travel exceeding 490 It (150 m) shall emp...

ASME A120.1:2014 pdf download.Safety Requirements for Powered Platforms and Traveling Ladders and Gantries for

Building Maintenance.

3.2.7 Height Restriction

3.2.7.1 Buildings with vertical platform travel exceeding 490 It (150 m) shall employ powered equipment with the

hoists located at the roof level.

3.2.7.2 Powered platforms shall not be ground rigged where the point of suspension exceeds 300 ft (92 m) above a

safe surface.

3.2.8 Movement and Positioning. The manual effort required to move, assemble, or operate equipment shall not

exceed 70 lb (33 kg) per person, except as otherwise stated in the Standard.

3.3 Carriage

Unless employing a suspension system listed in para. 3.2.6(b), (c), or (d), a carriage or equivalent shall be

provided, regardless of the elevation of the point of suspension or support, whenever it is necessary to traverse the suspended or supported portion of the equipment horizontally to a working or storage location or when access to or egress from the equipment is at approximately the elevation of the point of suspension.

3.3.1 Movement and Positioning

(a) The horizontal movement of a carriage shall he controlled to ensure safe movement and accurate positioning.

When carriages are running on rails or tracks, provisions shall be made to prevent disengagement of wheels from

their tracks.

(b) Manually propelled carriages shall only be used on level surfaces and be capable of movement with a positive

force of less than 70 lb (33 kg) per person, with a maximum of 140 lb (66 kg). The carriage shall have a manually released and automatically applied braking system that can stop and hold the carriage at the intended stopping

point.

3.3.2 Restriction of Movement

(a) Structural stops or curbs shall be provided to prevent the movement of the carriage beyond the designated

limits of travel and to activate end of travel interlock switches on electric powered carriages. Such stops, and

the building component(s) they are fastened to, shall be capable of withstanding/absorbing 140% of the dynamic

forces from the moving mass of a propelled carriage.

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