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1910.66(f)(5)(i) General Requirements
1910.66(f)(5)(i)(A)
Each suspended unit component, except suspension ropes and guardrail systems, shall be capable of supporting, without failure, at least four times the maximum intended live load applied or transmitted to that component.
1910.66(f)(5)(i)(B)
Each suspended unit component shall be constructed of materials that will withstand anticipated weather conditions.
1910.66(f)(5)(i)(C)
Each suspended unit shall be provided with a load rating plate, conspicuously located, stating the unit weight and rated load of the suspended unit.
1910.66(f)(5)(i)(D)
When the suspension points on a suspended unit are not at the unit ends, the unit shall be capable of remaining continuously stable under all conditions of use and position of the live load, and shall maintain at least a 1.5 to 1 stability factor against unit upset.
1910.66(f)(5)(i)(E)
Guide rollers, guide shoes or building face rollers shall be provided, and shall compensate for variations in building dimensions and for minor horizontal out-of-level variations of each suspended unit.
1910.66(f)(5)(i)(F)
Each working platform of a suspended unit shall be secured to the building facade by one or more of the following methods, or by an equivalent method:
1910.66(f)(5)(i)(F)(1)
Continuous engagement to building anchors as provided in paragraph (e)(2)(i) of this section;
1910.66(f)(5)(i)(F)(2)
Intermittent engagement to building anchors as provided in paragraph (e)(2)(iii)(A) of this section;
1910.66(f)(5)(i)(F)(3)
Button guide engagement as provided in paragraph (e)(2)(iii)(B) of this section; or
1910.66(f)(5)(i)(F)(4)
Angulated roping and building face rollers as provided in paragraph (e)(2)(iii)(C) of this section.
1910.66(f)(5)(i)(G)
Each working platform of a suspended unit shall be provided with a guardrail system on all sides which shall meet the following requirements:
1910.66(f)(5)(i)(G)(1)
The system shall consist of a top guardrail, midrail, and a toeboard;
1910.66(f)(5)(i)(G)(2)
The top guardrail shall not be less than 36 inches (914 mm) high and shall be able to withstand at least a 100-pound (444 n) force in any downward or outward direction;
1910.66(f)(5)(i)(G)(3)
The midrail shall be able to withstand at least a 75-pound (333 n) force in any downward or outward direction; and
1910.66(f)(5)(i)(G)(4)
The areas between the guardrail and toeboard on the ends and outboard side, and the area between the midrail and toeboard on the inboard side, shall be closed with a material that is capable of withstanding a load of 100 pounds (45.4 KG.) applied horizontally over any area of one square foot (.09 m2). The material shall have all openings small enough to reject passage of life lines and potential falling objects which may be hazardous to persons below.
1910.66(f)(5)(i)(G)(5)
Toeboards shall be capable of withstanding, without failure, a force of at least 50 pounds (222 n) applied in any downward or horizontal direction at any point along the toeboard.
1910.66(f)(5)(i)(G)(6)
Toeboards shall be three and one-half inches (9 cm) minimum in length from their top edge to the level of the platform floor.
1910.66(f)(5)(i)(G)(7)
Toeboards shall be securely fastened in place at the outermost edge of the platform and have no more than one-half inch (1.3 cm) clearance above the platform floor.
1910.66(f)(5)(i)(G)(8)
Toeboards shall be solid or with an opening not over one inch (2.5 cm) in the greatest dimension.
1910.66(f)(5)(iii) Single Point Suspended Working Platforms
1910.66(f)(5)(iii)(A)
The requirements of paragraphs (f)(5)(ii) (A) through (K) of this section shall also apply to a single point working platform.
1910.66(f)(5)(iii)(B)
Each single point suspended working platform shall be provided with a secondary wire rope suspension system which will prevent the working platform from falling should there be a failure of the primary means of support, or if the platform contains overhead structures which restrict the egress of the employees. A horizontal life line or a direct connection anchorage shall be provided as part of a personal fall arrest system that meets the requirements of subpart I of this part for each employee on the platform.
1910.66(f)(5)(iv) Ground-Rigged Working Platforms
1910.66(f)(5)(iv)(A)
Groundrigged working platforms shall comply with all the requirements of paragraphs (f)(5)(ii) (A) through (M) of this section.
1910.66(f)(5)(iv)(B)
After each day's use, the power supply within the building shall be disconnected from a ground-rigged working platform, and the platform shall be either disengaged from its suspension points or secured and stored at grade.
1910.66(f)(5)(v) Intermittently Stabilized Platforms
1910.66(f)(5)(v)(A)
The platform shall comply with paragraphs (F)(5)(ii) (A) through (M) of this section.
1910.66(f)(5)(v)(B)
Each stabilizer tie shall be equipped with a "quick connect-quick disconnect" device which cannot be accidently disengaged, for attachment to the building anchor, and shall be resistant to adverse environmental conditions.
1910.66(f)(5)(v)(C)
The platform shall be provided with a stopping device that will interrupt the hoist power supply in the event the platform contacts a stabilizer tie during its ascent.
1910.66(f)(5)(v)(D)
Building face rollers shall not be placed at the anchor setting if exterior anchors are used on the building face.
1910.66(f)(5)(v)(E)
Stabilizer ties used on intermittently stabilized platforms shall allow for the specific attachment length needed to effect the predetermined angulation of the suspended wire rope. The specific attachment length shall be maintained at all building anchor locations.
1910.66(f)(5)(v)(F)
The platform shall be in continuous contact with the face of the building during ascent and descent.
1910.66(f)(5)(v)(G)
The attachment and removal of stabilizer ties shall not require the horizontal movement of the platform.
1910.66(f)(5)(v)(H)
The platform-mounted equipment and its suspension wire ropes shall not be physically damaged by the loads from the stabilizer tie or its building anchor. The platform, platform mounted equipment and wire ropes shall be able to withstand a load that is at least twice the ultimate strength of the stabilizer tie.

Note: See figure II in appendix B of this section for a description of a typical intermittent stabilization system.
1910.66(f)(5)(vi) Button-Guide Stabilized Platforms
1910.66(f)(5)(vi)(A)
The platform shall comply with paragraphs (f)(5)(ii) (A) through (M) of this section.
1910.66(f)(5)(vi)(B)
Each guide track on the platform shall engage a minimum of two guide buttons during any vertical travel of the platform following the initial button engagement.
1910.66(f)(5)(vi)(C)
Each guide track on a platform that is part of a roof rigged system shall be provided with a storage position on the platform.
1910.66(f)(5)(vi)(D)
Each guide track on the platform shall be sufficiently maneuverable by platform occupants to permit easy engagement of the guide buttons, and easy movement into and out of its storage position on the platform.
1910.66(f)(5)(vi)(E)
Two guide tracks shall be mounted on the platform and shall provide continuous contact with the building face.
1910.66(f)(5)(vi)(F)
The load carrying components of the button guide stabilization system which transmit the load into the platform shall be capable of supporting the weight of the platform, or provision shall be made in the guide track connectors or platform attachments to prevent the weight of the platform from being transmitted to the platform attachments.

Note: See figure III in appendix B of this section for a description of a typical button guide stabilization system.
1910.66(f)(5)(ii) Two and Four-Point Suspended Working Platforms
1910.66(f)(5)(ii)(A)
The working platform shall be not less than 24 inches (610 mm) wide and shall be provided with a minimum of a 12 inch (305 mm) wide passage at or past any obstruction on the platform.
1910.66(f)(5)(ii)(B)
The flooring shall be of a slip-resistant type and shall contain no opening that would allow the passage of life lines, cables and other potential falling objects. If a larger opening is provided, it shall be protected by placing a material under the opening which shall prevent the passage of life lines, cables and potential falling objects.
1910.66(f)(5)(ii)(C)
The working platfrom shall be provided with a means of suspension that will restrict the platform's inboard to outboard roll about its longitudinal axis to a maximum of 15 degrees from a horizontal plane when moving the live load from the inboard to the outboard side of the platform.
1910.66(f)(5)(ii)(D)
Any cable suspended from above the platform shall be provided with a means for storage to prevent accumulation of the cable on the floor of the platform.
1910.66(f)(5)(ii)(E)
All operating controls for the vertical travel of the platform shall be of the continuous-pressure type, and shall be located on the platform.
1910.66(f)(5)(ii)(F)
Each operating station of every working platform shall be provided with a means of interrupting the power supply to all hoist motors to stop any further powered ascent or descent of the platform.
1910.66(f)(5)(ii)(G)
The maximum rated speed of the platform shall not exceed 50 feet per minute (0.3 ms) with single speed hoists, nor 75 feet per minute (0.4 ms) with multi-speed hoists.
1910.66(f)(5)(ii)(H)
Provisions shall be made for securing all tools, water tanks, and other accessories to prevent their movement or accumulation on the floor of the platform.
1910.66(f)(5)(ii)(I)
Portable fire extinguishers conforming to the provisions of §§1910.155 and 1910.157 of this part shall be provided and securely attached on all working platforms.
1910.66(f)(5)(ii)(J)
Access to and egress from a working platfrom, except for those that land directly on a safe surface, shall be provided by stairs, ladders, platforms and runways conforming to the provisions of subpart D of this part. Access gates shall be self-closing and self-latching.
1910.66(f)(5)(ii)(K)
Means of access to or egress from a working platform which is 48 inches (1.2 m) or more above a safe surface shall be provided with a guardrail system or ladder handrails that conform to the provisions of subpart D of this part.
1910.66(f)(5)(ii)(L)
The platform shall be provided with a secondary wire rope suspension system if the platform contains overhead structures which restrict the emergency egress of employees. A horizontal lifeline or a direct connection anchorage shall be provided as part of a personal fall arrest system that meets the requirements of subpart I of this part for each employee on such a platform.
1910.66(f)(5)(ii)(M)
A vertical lifeline shall be provided as part of a personal fall arrest system that meets the requirements of subpart I of this part for each employee on a working platform suspended by two or more wire ropes, if the failure of one wire rope or suspension attachment will cause the platform to upset. If a secondary wire rope suspension is used, vertical lifelines are not required for the personal fall arrest system, provided that each employee is attached to a horizontal lifeline anchored to the platform.
1910.66(f)(5)(ii)(N)
An emergency electric operating device shall be provided on roof powered platforms near the hoisting machine for use in the event of failure of the normal operating device located on the working platform, or failure of the cable connected to the platform. The emergency electric operating device shall be mounted in a secured compartment, and the compartment shall be labeled with instructions for use. A means for opening the compartment shall be mounted in a break-glass receptable located near the emergency electric operating device or in an equivalent secure and accessible location.

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