Single-Point Adjustable Suspension Scaffolds

A single-point adjustable suspension scaffold is a suspension scaffold consisting of a platform suspended by one rope from an overhead support and equipped with means to permit the movement of the platform to desired work levels.

Single-point adjustable suspension scaffolds must adhere to the following criteria:

• When two single-point adjustable suspension scaffolds are combined to form a two-point adjustable suspension scaffold, the resulting two-point scaffold must comply with the requirements for two-point adjustable suspension scaffolds.
• The supporting rope between the scaffold and the suspension device must be kept vertical unless all of the following conditions are met:
  • A qualified person has designed the rigging.
  • The scaffold is accessible to rescuers.
  • The supporting rope is protected to ensure that it will not chafe at any point where a change in direction occurs.
  • The scaffold is positioned so that swinging cannot bring the scaffold into contact with another surface.
• Boatswains' chair tackle must consist of correct size ball bearings or bushed blocks containing safety hooks and properly "eye-spliced" minimum 5/8-inch diameter first-grade manila rope, or other rope which will satisfy the criteria (such as strength and durability) of manila rope.
• Boatswains' chair seat slings must be reeved through four corner holes in the seat; must cross each other on the underside of the seat; and must be rigged so as to prevent slippage which could cause an out-of-level condition.
• Boatswains' chair seat slings must be a minimum of 5/8-inch diameter fiber, synthetic, or other rope which will satisfy the criteria (such as strength, slip resistance, durability, etc.) of first-grade manila rope.
• When a heat-producing process such as gas or arc welding is being conducted, boatswains' chair seat slings must be a minimum of 3/8-inch wire rope.
• Non-cross-laminated wood boatswains' chairs must be reinforced on their underside by cleats securely fastened to prevent the board from splitting.

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