Fall restraint versus personal fall arrest

Fall restraint and personal fall arrest both use equipment connected to a worker, but they do different jobs. A restraint system limits travel so the worker cannot reach an edge or other fall hazard. A fall-arrest system is designed for a possible fall: it catches the worker and limits the forces and distance involved. The preferred setup is the one that protects workers under the task, structure, equipment, and rules that apply.

Fall restraint keeps the worker away from the edge

A restraint arrangement may use a body harness or other permitted body support, connectors, anchorage, and a lanyard adjusted so the worker cannot reach the hazard. OSHA's residential-construction guidance describes effective restraint as rigged so the worker cannot get to the fall hazard and go over an edge. Because the worker is not exposed to a fall, the system avoids the free-fall and arrest forces associated with a fall-arrest event.

Fall arrest stops a fall in progress

A personal fall-arrest system is used to stop a worker who falls from a working level. OSHA's construction rule describes a system built from anchorage, connectors, a full-body harness, and appropriate connecting components such as a lanyard, lifeline, or deceleration device. Its setup must prevent contact with a lower level and comply with the force, free-fall, clearance, and equipment criteria in 29 CFR 1926.502(d).

Why clearance matters for fall arrest

A fall-arrest system needs enough unobstructed distance below the worker for the system to deploy and stop the fall without striking a lower level. The required clearance depends on the system components, worker connection point, lanyard or lifeline behavior, and site geometry. Use manufacturer instructions and a competent person's evaluation; a harness by itself does not guarantee safe clearance.

Anchorage and compatibility

The anchorage must be appropriate for the complete system and the number of workers attached. Connectors, harnesses, lifelines, lanyards, and energy absorbers must be compatible and used as designed. Do not attach a personal fall-arrest system to a guardrail or hoist, or improvise an anchor from a member that has not been evaluated for that load. The system must be installed and used under the governing OSHA standard and manufacturer's instructions.

Pre-use checks and response planning

• Inspect components before each use for wear, damage, deformation, corrosion, or missing labels.
• Confirm connectors lock, the harness fits, and components match the system design.
• For restraint, verify the worker cannot reach the edge despite normal movement or tool use.
• For arrest, confirm the anchorage and available clearance for the specific setup.
• Remove defective equipment from service and follow employer procedures.
• Plan how a suspended worker will be rescued promptly after an arrested fall.

Common exam distinctions

• Restraint prevents reaching the edge; arrest stops the fall after it begins.
• Guardrails and safety nets are separate conventional fall-protection methods.
• A work-positioning system supports a worker at a vertical surface; it is not automatically interchangeable with restraint or arrest.
• OSHA requirements vary by task, construction activity, and work location. Check the standard for the hazard rather than assuming one trigger height applies everywhere.

For NASCLA questions, first identify whether the selected system prevents a fall or arrests one. Then check that the system is correctly anchored, compatible, inspected, and suited to the task. The site-specific fall-protection plan and current OSHA construction standards govern real work.