- When welding is being performed from suspended scaffolds, the following precautions must be taken, as they apply, to
reduce the possibility of welding current arcing through the suspension wire ropes:
- An insulated thimble must be used to attach each suspension wire rope to its hanging support (such as cornice
hook or outrigger). Excess suspension wire rope and any additional independent lines from grounding must also be insulated;
- The suspension wire rope must be covered with insulating material at least 4 feet (1.2 m) above the hoist;
- If there is a tail line below the hoist, it must be insulated to prevent contact with the platform. The portion
of the tail line that hangs free below the scaffold must be guided or retained, or both, so that it does not become
- Each hoist must be covered with insulated protective covers; [1926.451(f)(17)(iii)]
- In addition to a work lead attachment required by the welding process, a grounding conductor must connected
from the scaffold to the structure (see Accident Report). The size of this conductor must be at least the size of the welding process work
lead, and this conductor must not be in series with the welding process or the work piece;
- An active welding rod or uninsulated welding lead must not be allowed to contact the scaffold or its suspension
- If the scaffold grounding lead is disconnected at any time, the welding machine must be shut off.
Subpart L Appendix E,
Figure 2, contains an illustrated diagram of welding precautions for a suspended scaffold platform.
Suspended Scaffold Platform Welding Precautions.