Chapter 3 of 520% of exam

Fall Protection

Because falls are the leading cause of death in construction, fall protection is one of the most important topics you will study. This chapter covers when fall protection is required, the conventional systems used, and the safe use of scaffolds and ladders. Mastering these concepts protects you against the single deadliest hazard on the job site.

When Fall Protection Is Required

In construction, fall protection is generally required at 6 feet or more above a lower level, though scaffolds and other situations have their own thresholds. Holes, openings, and unprotected edges are common fall points that must be guarded. Employers must assess the site and provide appropriate protection wherever these hazards exist.

The 6-foot rule
Fall protection is generally required in construction at 6 feet or more above a lower level.
Protect holes and openings
Floor and roof holes must be covered, guarded, or protected with personal fall arrest to prevent falls through them.
Guard unprotected edges
Open sides and edges 6 feet or more above a lower level require guardrails or another form of protection.

Conventional Fall Protection Systems

The three conventional systems are guardrail systems, safety net systems, and personal fall arrest systems. Each either prevents a fall or safely arrests it before the worker reaches a lower level. Choosing the right system depends on the task and site conditions.

Guardrail systems
A standard top rail is about 42 inches high and must withstand at least 200 pounds of outward or downward force, with a midrail between it and the surface.
Safety net systems
Nets catch falling workers and must be placed as close as practicable below the work surface, never more than 30 feet below.
Personal fall arrest systems
PFAS use an anchorage, full-body harness, and connector to arrest a fall before the worker strikes a lower level.

Personal Fall Arrest Systems

A personal fall arrest system has three parts, sometimes remembered as the ABCs: anchorage, body harness, and connector. Body belts are no longer allowed because they can cause internal injuries; a full-body harness is required. Workers must minimize free fall distance and calculate total fall clearance to avoid hitting a lower level.

Anchorage, body harness, connector
All three components must be present and compatible for the system to arrest a fall safely.
Limit arresting force
The system must limit the maximum arresting force on the body to 1,800 pounds when using a full-body harness.
Calculate fall clearance
Account for lanyard length, deceleration distance, harness stretch, and a safety margin so the worker does not hit the ground.
Inspect before each use
Harnesses, lanyards, and connectors must be inspected before every use and removed from service if damaged.

Scaffold Safety

Scaffolds must be designed, erected, and inspected under the supervision of a competent person. Most scaffold platforms require fall protection above 10 feet, and platforms must be fully planked to prevent falls through gaps. Defective scaffolds must be tagged and taken out of service.

Inspect before each shift
A competent person must inspect scaffolds before each work shift and after any event that could affect their integrity.
Fall protection above 10 feet
Most scaffold platforms require guardrails or personal fall arrest when more than 10 feet above a lower level.
Fully plank platforms
Platforms must be fully planked or decked with gaps generally no more than 1 inch around uprights.

Ladder Safety

Ladders cause many falls when used improperly. Extension ladders should follow the 4-to-1 rule and extend above the landing, and workers should maintain three-point contact while climbing. Damaged ladders must be removed from service, and stepladders should never be climbed on the top cap.

The 4-to-1 rule
Place the base 1 foot out from the wall for every 4 feet of working height for stable footing.
Extend 3 feet above the landing
An access ladder must extend at least 3 feet above the landing or provide a grab rail.
Maintain three-point contact
Keep two hands and one foot, or two feet and one hand, on the ladder while climbing and carry tools separately.
Remove damaged ladders
Ladders with cracked rails or broken rungs must be tagged out of service and repaired or discarded.
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Last updated: July 2026

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