Coupler means a device for locking together the tubes of a tube and coupler scaffold. Equivalent means alternative designs, materials or methods to protect against a hazard which the employer can demonstrate will provide an equal or greater degree of safety for employees than the methods, materials or designs specified in the standard. Exposed power lines means electrical power lines which are accessible to employees and which are not shielded from contact. Such lines do not include extension cords or power tool cords. Eye or Eye splice means a loop with or without a thimble at the end of a wire rope.
Failure means load refusal, breakage, or separation of component parts.
Load refusal is the point where the ultimate strength is exceeded. Form scaffold means a supported scaffold consisting of a platform supported by brackets attached to formwork. Guardrail system means a vertical barrier, consisting of, but not limited to, toprails, midrails, and posts, erected to prevent employees from falling off a scaffold platform or walkway to lower levels. Hoist means a manual or power-operated mechanical device to raise or lower a suspended scaffold. Horse scaffolds constructed of metal are sometimes known as trestle scaffolds.