When winding drum hoists are used on a suspended scaffold, they shall contain not fewer than four wraps of the suspension rope at the lowest point of scaffold travel. When other types of hoists are used, the suspension ropes shall be long enough to allow the scaffold to be lowered to the level below without the rope end passing through the hoist, or the rope end shall be configured or provided with means to prevent the end from passing through the hoist.
Ropes shall be replaced or removed if any of the following conditions exist, and as otherwise prescribed by rule of the department:
- Any physical damage that impairs the function and strength of the rope.
- Presence of kinks that might impair the tracking or wrapping of the rope around the drums or sheaves.
- Presence of abrasion, corrosion, scrubbing, flasttening or peening causing the loss of more than one-third of the original diameter of the outside wires.
- Heat damage caused by a torch or any damage caused by contact with electrical wires.
- Evidence that the secondary brake has been activated during an overspeed condition and has engaged the suspension rope.
Precautions shall be taken to prevent the possibility of arcing through the suspension wire rope during welding operations.
The suspension wire rope shall be covered with insulating material extending at least 4 feet (1219 mm) above the hoist. If there is a tail line below the hoist, it shall be insulated to prevent contact with the platform. The portion of the tail line that hangs free below the scaffold shall be guided or retained or both so that it does not become grounded.
In addition to a work lead attachment required by the welding process, a grounding conductor shall be connected from the scaffold to the structure. The size of the connector shall be at least the size of the welding process work lead, and this conductor shall not be in series with the welding process or the work piece.
An active welding rod or uninsulated welding lead shall not be allowed to make contact with the scaffold or its suspension system.
When wire clips are used on suspended scaffolds there shall be a minimum of three wire rope clips installed a minimum of six rope diameters apart. The clips shall be retightened to the manufacturer's specifications after initial loading. U-bolt clips shall not be used at the point of suspension. When U-bolt clips are used, the U-bolt shall be placed over the dead end of the rope and the saddle shall be placed over the live end of the rope.