Fall Protection & Working at Heights

You do not need to be on a high-rise for a fall to kill you. Falls are the leading cause of death in construction and a major cause of serious injury in other industries, and a drop of one story is enough. This is the working knowledge for anyone who goes up: when protection is required, what each system does, and how to use your harness correctly. Nothing here replaces hands-on training with the equipment you will actually use. Tree climbing and arborist work use different gear and different rules, so they are not covered here.

What You Will Be Able to Do

• Say when fall protection is required in general industry and in construction.
• Choose between guardrails, covers, restraint and fall arrest.
• Name the three parts of a personal fall arrest system and the limits on each.
• Put on and inspect a harness, and know when gear comes out of service.
• Explain why rescue must be planned before anyone goes up.

When Fall Protection Is Required

The height is measured from the surface you work on to the lower level. Dangerous equipment means things like open vats, moving machinery and acid tanks, where even a short fall is deadly. State plans and employers can set stricter rules, and many employers require protection at lower heights.

Fixed ladders. In general industry, a fixed ladder that extends more than 24 feet above a lower level needs protection. Ladders installed on or after November 19, 2018 must have a ladder safety system or a personal fall arrest system. Older ladders may still rely on a cage or well for now, but every fixed ladder must have a ladder safety system or personal fall arrest system by November 18, 2036. OSHA proposed removing that deadline in April 2026. It stands until a final rule changes it, so check the current rule.

Choosing the Right Protection

The best fall protection is not needing any. Build it on the ground, use a long-handled tool, or move the task to a safer spot. If someone has to be at height, work down this list.

Systems that protect you without any action on your part beat those that depend on you. Restraint beats arrest because you never fall at all. A positioning system is different again. It holds you in place on a vertical surface, such as a wall of rebar, so both hands are free. In construction, it must be rigged so you cannot free fall more than 2 feet. General industry rules set strength and drop-test limits for these systems instead.

Guardrails

Guardrails are the most common passive system. OSHA's specifications are nearly the same in general industry and construction:

• Top rail: 42 inches above the surface, plus or minus 3 inches.
• Strength: the top rail must hold a 200-pound force, pushed outward or downward, without dropping below 39 inches.
• Midrail: about halfway up, and it must hold 150 pounds. Screens or mesh can take its place.
• Openings: no gap wider than 19 inches, which is why trainers often describe it as a 19-inch sphere that must not fit through.
• Toeboard: at least 3.5 inches high where tools or material could fall on people below.
• Surface: smooth enough not to cut you or snag clothing. Steel or plastic banding cannot be used as a rail.

If you find a rail missing or loose, do not lean on it, and do not take one down to make your job easier without putting other protection in place. Report it.

Holes and Covers

A hole is any gap 2 inches or more across at its narrowest point. A person can step in it, trip on it or fall through it, and things can drop through it onto people below. Skylights count as holes, too. A cover must:

• Hold at least twice the heaviest load expected on it.
• Be secured so that wind, equipment or workers cannot shift it.
• Be marked HOLE or COVER, or color coded, so that no one thinks it is scrap plywood.

If you must lift a cover to work, guard the opening until the cover goes back.

Personal Fall Arrest Systems

Think of the ABCs: anchorage, body support and connectors. All three must be compatible, and all three must be there.

Anchorage. The fixed point you tie off to. It must support at least 5,000 pounds for each worker attached, or be designed under a qualified person as part of a complete system with a safety factor of at least two. It must be separate from whatever holds up a platform. Tie off at or above your D-ring when you can. Conduit, handrails, vent pipes, rebar and other items not rated for fall arrest are not anchors.

Body support. A full-body harness spreads the force across your thighs, pelvis, chest and shoulders. A body belt is not allowed for fall arrest.

Connectors. These join your harness to the anchor:

• Shock-absorbing lanyard: usually 6 feet long, with a section that tears open during a fall. Its job is to lower the force on your body as you stop.
• Self-retracting lifeline (SRL): a line that feeds in and out of a housing, and locks when it senses a fall, much like a seat belt. It usually gives a much shorter free fall.
• Rope grab and vertical lifeline: a device that slides along a line and locks when you drop. One worker per line, with rare exceptions.

Snap hooks must be the locking type. Do not tie knots in a lanyard, do not wrap it around a beam unless it is made for that, and do not clip two lanyards together unless the maker allows it.

The Numbers to Know

Clearance

A fall arrest system needs room to work. Add up how far you drop before you stop, then check that nothing is in the way.

These are rules of thumb that assume the anchor is at or above your D-ring. Read the label on your gear, because the actual numbers vary. If you do not have the clearance, change the system.

Warning: A 6-foot lanyard does not protect you on a platform 10 feet off the floor. You will hit the floor before it stops you. Use an SRL anchored overhead, or use restraint.

Wearing a Harness

1. Hold the harness by the back D-ring and shake it, so the straps fall into place.
2. Slip it on like a vest, with the D-ring between your shoulder blades.
3. Fasten the chest strap across the middle of your chest.
4. Fasten the leg straps, and adjust them until they are snug, with room for only a flat hand underneath.
5. Tuck in loose strap ends.
6. Have a coworker check the D-ring position and the straps.

A loose harness can let you slip out or can injure you in a fall. A D-ring that rides too low can tip you forward as you stop.

Inspecting Your Gear

Check it before every use, and take it out of service if you find:

• Cut, frayed, burned, melted or chemically damaged webbing.
• Broken or pulled stitching.
• Bent, cracked or rusted D-rings, buckles or snap hooks.
• Snap hooks whose gates do not close and lock.
• A shock absorber that has started to open, or a tripped impact indicator.
• Missing or unreadable labels.

For an SRL, check the housing for damage, pull out the line and look it over, give it a sharp tug to confirm that it locks, let it retract smoothly, and check the inspection tag. Most makers require a formal inspection by a competent person or the factory at least once a year.

Anything that has stopped a fall comes out of service at once, even if it looks fine, because the damage can be hidden inside. OSHA does not allow it back into use until a competent person finds it undamaged and suitable, and many makers simply require you to retire it.

Rescue

Stopping the fall is only half the job. OSHA requires employers to provide prompt rescue. A person who hangs still in a harness can have blood pool in their legs, then faint and stop breathing properly. OSHA calls this orthostatic intolerance, and many workers know it as suspension trauma. Without prompt rescue, it can be fatal, and for some people it can start within minutes.

Before anyone ties off, you should know who performs the rescue, with what equipment, and how quickly. If you are hanging and waiting, keep your legs moving, and use relief straps if your harness has them.

Who Does What

• Competent person: can spot fall hazards and has authority to correct them. This person inspects systems, checks that they are installed correctly, and in construction often trains workers.
• Qualified person: has the education or deep experience to design anchors, horizontal lifelines and complete systems.

OSHA requires training before you work at height. You must be retrained if the work or the equipment changes, or if you show that you do not understand it.

Common Mistakes

Check Your Understanding

1. A warehouse mezzanine has an open edge 5 feet above the floor, and a worker needs to stack boxes along it. Is protection required?

Yes. In general industry, the trigger is 4 feet. The edge needs a guardrail or another approved system.

2. You pick up a harness and find a small cut in a leg strap. It is the last one in the crib. What do you do?

Take it out of service and tag it. Webbing with a cut cannot be trusted, and the job waits until you have sound gear.

3. A coworker clips his lanyard to an electrical conduit because it is the nearest thing overhead. What do you say?

That conduit is not an anchor. He should unhook and move to a rated anchor before he continues.

4. You will be working 11 feet above a concrete floor, and your crew has only 6-foot shock-absorbing lanyards. Is that OK?

No. You need about 13.5 feet. Get an SRL with an overhead anchor, or set up restraint.

Key Takeaways

• Protection starts at 4 feet in general industry, 6 feet in construction and 10 feet on scaffolds.
• Remove the fall hazard if you can, then prefer guardrails and covers, then restraint, then arrest.
• Anchors must hold 5,000 pounds per worker or be designed by a qualified person.
• Fall arrest limits are 1,800 pounds of force, a 6-foot free fall and 3.5 feet of deceleration.
• Inspect gear before every use, and pull anything that has stopped a fall.
• Check clearance and know the rescue plan before you go up.