When using a full body harness (FBH) as part of a fall arrest system (FAS), you need to inspect every component before each use, ensure your anchorage point can hold at least 5,000 pounds, and verify that your harness fits correctly with all straps snug against your body. These steps aren’t optional extras. Falls remain one of the leading causes of workplace fatalities, and a harness only protects you if it’s set up and worn properly.
Know the Three Core Components
A personal fall arrest system has three parts that work together: an anchorage point, a body harness, and a connector linking the two. If any one of these fails or is used incorrectly, the entire system fails.
The anchorage point is where the system attaches to the structure. OSHA requires it to support at least 5,000 pounds per worker attached, or be engineered with a safety factor of at least two under the supervision of a qualified person. The anchorage must also be independent of anything supporting a platform or scaffold you’re standing on. Never clip into a vent pipe, railing, or anything that wasn’t specifically designated as an anchor.
The body harness distributes fall arrest forces across your thighs, pelvis, waist, chest, and shoulders. Unlike a simple belt, which can cause serious internal injuries during a fall, a full body harness spreads the impact so no single area absorbs all the force. Standard harnesses are rated for users between 130 and 310 pounds. If you fall outside that range, you need specialized equipment.
The connector is the link between your harness and the anchor. This could be an energy-absorbing lanyard, a self-retracting lifeline, or a rope grab device. Energy-absorbing lanyards contain a stitched pack that tears open during a fall, slowing you down gradually instead of jerking you to a sudden stop. Self-retracting lifelines work like a car seatbelt, locking when sudden force is applied. Your choice of connector depends on how much clearance you have below you and whether you need to move around.
Inspect Your Harness Before Every Use
A visual and hands-on inspection before each use is one of the most important things you can do. Run every inch of webbing through your hands and look for specific problems.
On the webbing, check for:
- Fraying or abrasions from rubbing against rough surfaces
- Uneven thickness or stretching, which can indicate the harness has already caught a fall
- Burnt, charred, or melted fibers from heat exposure
- Hard, shiny, or brittle spots, a sign of heat or UV damage
- Discoloration that could point to chemical exposure
On the metal hardware (D-rings, buckles, grommets), look for:
- Bends, twists, or distortion of any kind
- Cracks, breaks, or rough edges
- Rust or corrosion
- Broken or distorted grommets
Also check the load indicator, a small stitched tag built into many modern harnesses. If it’s ripped or separating, the harness has arrested a fall and must be retired immediately. Finally, confirm that all labels are legible. A harness with missing or unreadable labels should be pulled from service because you can’t verify its specifications or manufacture date.
Put It On Correctly
Hold the harness by the dorsal D-ring (the attachment point on your upper back) and let it hang freely. This helps untangle the straps so you can identify the leg loops from the shoulder straps. Step into the leg straps first, then pull the harness up over your shoulders like a vest. Connect the chest strap and adjust everything.
A properly fitted harness should be snug but not restrictive. You should be able to slide a flat hand between the webbing and your body, but no more. Loose straps create slack that increases the distance you fall before the system engages, and they can shift the harness out of position so forces hit the wrong parts of your body. The dorsal D-ring should sit between your shoulder blades, not down near your lower back. Leg straps should be tight enough that you can’t slide a fist underneath them.
Remove anything from your pockets or tool belt that could injure you during a sudden stop. A wrench in your chest pocket becomes a serious hazard when your body decelerates from a fall.
Plan for Enough Fall Clearance
Your fall arrest system needs enough open space below you to do its job. This is something people frequently underestimate. A standard six-foot energy-absorbing lanyard can extend an additional 3.5 feet when its shock pack deploys. Add your own height, the distance from the D-ring to your feet, harness stretch, and a safety margin, and you could need 18 feet or more of clearance below your anchor point. If you’re working on a structure where the ground or next level is closer than that, a self-retracting lifeline or shorter connector is a better choice because it limits free-fall distance to just a couple of feet.
Know What Happens After a Fall
If your system catches a fall, two things need to happen quickly. First, rescue. Hanging motionless in a harness is not a safe resting position. The leg straps compress blood vessels in your thighs, and within minutes, blood begins pooling in your lower legs instead of circulating back to your heart. This condition, sometimes called suspension trauma, can cause you to lose consciousness and become life-threatening in under 30 minutes.
Many harnesses come with built-in trauma relief straps, small loops you can deploy and stand in while waiting for rescue. Standing in these straps lets you push with your legs, relieving pressure on the blood vessels and keeping circulation moving. If your harness has them, know where they are and practice deploying them before you ever need to use them at height. Every worksite where fall arrest systems are in use should have a rescue plan in place before work begins.
Second, the equipment must be retired. Any harness, lanyard, or connector that has arrested a fall is permanently compromised, even if it looks fine. The internal fibers and shock-absorbing components have done their one-time job. Tag the equipment, remove it from service, and replace it.
Store and Maintain Your Equipment
When your harness isn’t in use, store it away from direct sunlight. UV radiation breaks down synthetic webbing over time, making it stiff and brittle in ways that aren’t always visible. Keep it off the ground and away from chemicals, solvents, and caustic substances. If the metal components come into contact with acids or caustics, clean them as soon as possible to prevent corrosion.
Harnesses don’t have a universal expiration date stamped on them. Different manufacturers set different service life recommendations, typically ranging from five to ten years from the date of first use. But calendar age is only one factor. A harness used daily on a construction site ages far faster than one used occasionally for roof maintenance. A qualified inspector at your worksite is the right person to make the retirement call, weighing the harness’s age, condition, exposure history, and the manufacturer’s guidelines together. When in doubt, replace it. The cost of a new harness is trivial compared to what it’s protecting.