A worker is installing HVAC equipment on a flat commercial roof 20 feet above grade. The work area is 8 feet from the roof edge. What fall protection is required under Cal/OSHA?
Correct Answer
A) Warning line system at 6 feet from edge
For low-slope roofs, warning line systems can be used when work is performed more than 6 feet from the edge, but the worker is within 6 feet of the edge requiring protection.
Why This Is the Correct Answer
Under Cal/OSHA Title 8 Section 1716 and federal OSHA 29 CFR 1926.502, on low-slope roofs (4:12 pitch or less), workers may use a warning line system when the work area is more than 6 feet from the roof edge. The warning line must be erected at least 6 feet from the unprotected edge. In this scenario, the worker is 8 feet from the edge, which is beyond the 6-foot threshold — a warning line system at 6 feet from the edge is the appropriate and compliant method. The warning line alerts workers that they are approaching the fall hazard zone.
Why the Other Options Are Wrong
Option B: Personal fall arrest system
A personal fall arrest system (PFAS) — harness and lanyard — is required when workers are within 6 feet of the unprotected edge or when a warning line system is not used. Since this worker is 8 feet from the edge, a warning line system is the less-restrictive compliant option. PFAS would be required if the worker moved within 6 feet of the edge.
Option C: Safety monitoring system only
A safety monitoring system alone is only permissible under limited conditions: when other fall protection methods are infeasible, and only when accompanied by a competent person continuously monitoring the workers. It cannot be used as the sole protection on a 20-foot roof where other methods are feasible.
Option D: Guardrail system at roof edge
A guardrail system at the roof edge is a valid fall protection method, but the question asks what is 'required' given the worker's location 8 feet from the edge. A warning line at 6 feet from the edge is the specific system designed for this scenario on low-slope roofs, and it is less restrictive and more practical than installing a full guardrail along the entire perimeter.
Memory Technique
Remember the '6-foot rule' for low-slope roofs: 'Six feet safe = Warning Line. Six feet or closer = Harness or Rail.' The worker at 8 feet is beyond the 6-foot boundary, so a warning line at 6 feet from the edge creates a buffer zone. Picture the warning line as a yellow caution tape 6 feet from the edge — step past it and you need a harness.
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