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MODULE 7: Warning Line System (WLS)

August 23, 2022

[vc_row][vc_column][vc_single_image image=”18432″ img_size=”full”][vc_column_text]Warning Lines serve as visual reminders of the defined work area, and to clearly mark areas where workers do not belong.

A Warning line system (WLS) may ONLY be used on floors, flat, or low-sloped roofs during construction work and shall be erected around all sides of the work area.

A WLS must consist of wires, rope, or chains between 34 and 39 inches high with supporting pillars (stanchions). WLS must be flagged at no more than 6-foot intervals with a high visibility material.

The wire, rope or chains must have a minimum tensile strength of 500 pounds and, after being attached to the stanchions, must be capable of supporting — without breaking — the loads applied to the stanchions.

Stanchions must be capable of resisting, without tipping, when a force of 16 pounds is applied horizontally against the stanchions and 30 inches above the walking or working surface, perpendicular to the warning line and in the direction of the roof floor or platform edge.

The line consisting of wire rope or chains must be attached at each stanchion in such a way that the pulling on one section of the line will not result in a slack being taken up in adjacent sections before the stanchion tips over.

Working within the Warning Line System does not require fall protection. No workers will be allowed in the area between the roof or floor edge and the WLS without fall protection. Fall protection is required when working outside the WLS.[/vc_column_text][/vc_column][/vc_row]