What does SWL stand for and how is it used in backstage rigging?

• A. Structural Weight Limit; the maximum load a component can safely carry.
• B. Safe Working Load; the maximum load a component or assembly should safely carry.
• C. Standard Wind Load; not used in rigging.
• D. Safe Load Level; the minimum required load.

Answer: (B)

SWL stands for Safe Working Load—the maximum load a rigging component or assembly should safely carry during normal use. In backstage rigging, this rating guides what can be hung from a point or carried along a line. Each piece of hardware (shackles, turnbuckles, wire rope, hoists, etc.) has an SWL that comes from manufacturer testing, providing a safety margin below the material’s breaking strength. When planning a rig, you ensure the expected load, including dynamic forces from movement, stays at or below the SWL at every attachment point, and you typically choose hardware with an SWL well above the anticipated load. This safety-oriented limit is different from breaking strength and from terms like wind load, structural weight limit, or any minimum-load concept; SWL is about safe, usable capacity.