The Occupational Safety and Health Administration (OSHA) sets the legal floor for work at height in the United States. Its rules are federal regulations, enforceable by citation and penalty, and they set the employer’s duties, including when fall protection is required, who is responsible, and what training is required, together with requirements for the equipment and systems themselves. The Z359 consensus standards, published by the American Society of Safety Professionals (ASSP), cover equipment, system design, and managed fall protection programs. This guide focuses on the federal general industry and construction rules. Where OSHA states a number, we cite the exact section so you can check it against the source.
Two primary frameworks, and the rules around them
OSHA fall protection is organized mainly into two frameworks in Title 29 of the Code of Federal Regulations (CFR), split by industry: general industry under 29 CFR 1910, and construction under 29 CFR 1926. They are the starting point for most work at height, and they are not the whole picture. Other rules add or change the requirements: maritime work sets its own triggers under separate standards (shipyard employment, 29 CFR 1915; marine terminals, 1917; longshoring, 1918); OSHA-approved state plans can be stricter than federal OSHA, for example California’s Cal/OSHA; and specialized construction subparts govern particular activities such as scaffolds, steel erection, cranes, stairways and ladders, and electric power. Always verify the standard that applies to the actual work.
| Framework | Covers | Trigger height |
|---|---|---|
| 29 CFR 1910 Subpart D · Subpart I, §1910.140 | General industry | Generally 4 ft (1.2 m), set in Subpart D, Walking-Working Surfaces (1910.28). Personal fall protection system criteria are in 1910.140, which sits in Subpart I, Personal Protective Equipment. |
| 29 CFR 1926 Subpart M §§1926.500 to 1926.503 | Construction | Commonly 6 ft (1.8 m) under 1926.501(b). Some hazards require protection below that height, and other subparts govern specific work. |
The general industry rules are the newer of the two. They came out of OSHA’s Walking-Working Surfaces and Personal Protective Equipment (Fall Protection Systems) Final Rule, published November 18, 2016 and effective January 17, 2017, and they track more closely with current consensus practice than the older construction standard. Construction Subpart M goes back to 1994. Most of this page works from the construction side, then notes where general industry differs.
Start with the hazard, not the harness
Before any discussion of equipment, the sound approach is the hierarchy of controls: remove the hazard where you can, and reach for personal protective equipment last. A personal fall arrest system is the final layer, used when the fall hazard cannot be designed out or guarded against. The hierarchy is a way to choose among controls, not an OSHA requirement.
More effective
- Most effectiveEliminate the fall hazardDo the work at ground level, or design the exposure out entirely.
- Passive protectionGuardrails prevent a fall and safety nets arrest one. Neither relies on the worker.
- Last resortPersonal fall protectionTravel restraint first, then personal fall arrest.
When fall protection is required
Section 1926.501 lists the construction operations that trigger fall protection. The common Subpart M threshold is 6 ft above a lower level (1926.501(b)), but some hazards require protection below that height, and some activities are governed by other subparts. At or above the applicable trigger height, the employer must provide a system. A few common triggers, and what each one allows:
| Situation | Section | Permitted systems |
|---|---|---|
| Unprotected sides and edges | 1926.501(b)(1) | Guardrail, safety net, or personal fall arrest |
| Leading edges | 1926.501(b)(2) | Guardrail, safety net, or personal fall arrest (written plan only where the employer can demonstrate these are infeasible or create a greater hazard) |
| Holes, including skylights: falling through, more than 6 ft above a lower level | 1926.501(b)(4)(i) | Personal fall arrest, covers, or guardrails around the hole |
| Holes, including skylights: tripping or stepping into or through | 1926.501(b)(4)(ii) | Covers |
| Holes, including skylights: objects falling through | 1926.501(b)(4)(iii) | Covers |
| Formwork and reinforcing steel | 1926.501(b)(5) | Personal fall arrest, safety net, or positioning device |
| Dangerous equipment, less than 6 ft above | 1926.501(b)(8)(i) | Guardrail or equipment guards, required even below 6 ft |
| Roofing work on low-slope roofs, 4:12 or less | 1926.501(b)(10) | Guardrail, safety net, or personal fall arrest, or a warning line combined with a guardrail, safety net, personal fall arrest, or safety monitoring system. On roofs 50 ft or less in width, safety monitoring alone is permitted for roofing work. |
| Steep roofs, over 4:12 | 1926.501(b)(11) | Guardrail with toeboards, safety net, or personal fall arrest |
| Any surface not otherwise addressed | 1926.501(b)(15) | Guardrail, safety net, or personal fall arrest |
Read the holes rows closely. Only fall-through protection carries the 6 ft trigger. Paragraphs (b)(4)(ii) and (iii) set no height, so a hole a worker could step into, or that objects could fall through, needs a cover regardless of the drop below it. Skylights count as holes throughout.
That is a condensed view. The section defines fifteen distinct triggers in all, from hoist areas and excavations to overhand bricklaying and wall openings, each naming the systems that satisfy it. The employer also has to confirm that the walking or working surface can actually bear the load before anyone is allowed on it (1926.501(a)(2)).
The three jobs that can use a written plan instead
For most triggers, one of the systems named in the trigger is required, and a written plan is not an option. Only three operations may substitute a written fall protection plan for conventional protection, and only when the employer can demonstrate that conventional systems are infeasible or would create a greater hazard:
- Leading edge work (1926.501(b)(2)(i))
- Precast concrete erection (1926.501(b)(12))
- Residential construction (1926.501(b)(13))
The regulation presumes that a conventional system is feasible and will not create a greater hazard. The burden is on the employer to establish otherwise for a particular situation (notes to 1926.501(b)(2)(i), (b)(12) and (b)(13)). The plan itself has to meet the criteria in 1926.502(k).
What the equipment has to do
When the chosen answer is a personal fall arrest system, section 1926.502 sets the performance the system has to deliver. These numbers recur across US fall protection practice, and the general industry equipment criteria in 1910.140(c) and (d) use the same headline limits, with the differences set out further down this page. OSHA gives each value in metric as well, in meters (m) and kilonewtons (kN).
| Requirement | Limit | Section |
|---|---|---|
| Maximum arresting force on the body (full body harness) | 1,800 lb (8 kN) | 1926.502(d)(16)(ii) |
| Maximum free fall distance | 6 ft (1.8 m). OSHA interpretations accept more only where the employer cannot provide a more suitable anchorage or other form of fall protection: free fall must then be limited as far as possible, with arresting force at or below 1,800 lb (letters of interpretation, January 13, 2000 and September 21, 2007). | 1926.502(d)(16)(iii) |
| Maximum deceleration distance | 3.5 ft (1.07 m). A limit on system performance, not a clearance allowance: for planning, see Fall clearance and the physics of a fall. | 1926.502(d)(16)(iv) |
| Anchorage strength, per worker | 5,000 lb (22.2 kN), or designed, installed, and used under the supervision of a qualified person as part of a complete system that maintains a safety factor of at least two. | 1926.502(d)(15) |
| Lanyards and vertical lifelines, minimum breaking strength | 5,000 lb (22.2 kN) | 1926.502(d)(9) |
| Snaphook type | Locking only, since January 1, 1998 | 1926.502(d)(5) |
Body belts are out. In construction, since January 1, 1998, a body belt cannot be part of a personal fall arrest system (1926.502(d)), and general industry prohibits it as well (1910.140(d)(3)). A full body harness is required, because it spreads the arresting force across the thighs, pelvis, waist, chest, and shoulders rather than concentrating it at the waist. A body belt remains acceptable in a positioning device system, which is regulated separately (1926.502(e)). See The ABCs of fall protection for what the harness is doing, and Fall clearance and the physics of a fall for how these numbers turn into the room a fall needs.
Protecting people from falling objects
Fall protection is not only about the worker. Where an employee is exposed to objects falling from above, the employer has to have each employee wear a hard hat and put one of three measures in place (1926.501(c); in general industry, 1910.28(c)):
- Toeboards, screens, or guardrail systems that stop objects from falling from higher levels
- A canopy structure, with potential objects kept far enough from the edge that they would not go over if displaced
- A barricaded area that people are kept out of, again with objects held back from the edge
Securing the tools themselves is a related discipline with its own consensus standard, published by the International Safety Equipment Association (ISEA) and approved by the American National Standards Institute (ANSI). It is covered in ANSI/ISEA 121 explained.
Training is part of the rule
Equipment is only half of compliance. Section 1926.503 requires the employer to train every employee who might be exposed to a fall hazard, and the trainer has to be a competent person (1926.503(a)). In general industry the counterpart is 1910.30, and there the trainer has to be a qualified person (1910.30(a)(2)). The training has to cover, among other topics, the nature of the hazards in the work area, how to use and inspect the systems in play, and the standards in Subpart M itself.
Training also has to be documented. The employer prepares a written certification record carrying the employee’s name, the date or dates of training, and the signature of the trainer or employer (1926.503(b)). Retraining is required whenever the employer has reason to believe a trained employee does not have the understanding and skill the training is meant to give. OSHA’s examples include changes in the workplace, or in the fall protection systems or equipment, that render previous training obsolete, and gaps in an employee’s knowledge or use of the equipment that show the training was not retained (1926.503(c)). For what “competent person” means and how it differs from a qualified person, see Who is responsible.
General industry: the same floor, a newer rulebook
Section 1910.140 is the general industry counterpart to the construction equipment criteria. It sits in Subpart I, Personal Protective Equipment. The trigger heights are lower, generally 4 ft, and set separately in Subpart D, Walking-Working Surfaces (1910.28). On the equipment side it uses the same headline numbers, 1,800 lb arresting force and 5,000 lb anchorage, and differs from construction in a few details that matter when one crew works under both:
| Requirement | General industry, §1910.140 | Construction, §1926.502 |
|---|---|---|
| Snaphooks and carabiners | Automatic locking, requiring at least two separate, consecutive movements to open (c)(9) | Snaphooks of the locking type only, since January 1, 1998 (d)(5) |
| Gate strength | 3,600 lb without the gate separating from the nose by more than 0.125 in (c)(8) | No separate gate-strength value |
| Inspection | Before initial use during each workshift (c)(18) | Prior to each use (d)(21) |
| Harness attachment point | Center of the back near shoulder level. Pre-sternal allowed only if free fall is limited to 2 ft or less (c)(22) | Center of the back near shoulder level, or above the wearer’s head (d)(17) |
| Free fall | 6 ft, or more where the employer can demonstrate the manufacturer designed the system to allow it and tested it to keep arresting force at or below 1,800 lb (d)(2)(ii) | 6 ft (d)(16)(iii) |
| Rescue | “The employer must provide for prompt rescue of each employee in the event of a fall” (c)(21). Unlike construction, the text names no self-rescue alternative. | Prompt rescue, or assurance that employees are able to rescue themselves (d)(20) |
Where a crew works under both standards, the safer design is usually to meet the more demanding requirement in each row. That is a design instinct, not a compliance shortcut: what you actually have to meet depends on the standard that applies to the work, the industry, the employer’s program, and how the system is used. How OSHA relates to the voluntary consensus standards is the subject of How OSHA and ANSI fit together.
