2.4 Restraint, positioning and climbing systems
Three systems share the same hardware and do completely different jobs. Fall arrest catches you after you fall. Restraint stops you from reaching the edge, so there is no fall to catch. Positioning holds you against a vertical surface so both hands are free. Mixing them up is not a paperwork error: a positioning lanyard used for arrest will not survive the forces, and a fall arrest rig used for positioning leaves a worker leaning back on a shock pack that was never meant to be loaded all day.
1 Three jobs, three systems
| Fall arrest | Travel restraint | Positioning | |
|---|---|---|---|
| Purpose | Stop a fall in progress | Prevent reaching the fall hazard at all | Support the worker at a vertical surface, hands free |
| Free fall permitted | Up to 6 ft — 1926.502(d)(16)(iii) | None, by design | No more than 2 ft — 1926.502(e)(1) |
| Attachment on the harness | Dorsal D-ring, or above the head — (d)(17) | Typically dorsal; belt acceptable | Side (hip) D-rings, or a body belt |
| Anchorage | 5,000 lb per person, or SF 2 under a qualified person — (d)(15) | Only needs to hold the restraint load; still engineered | Twice the potential impact load, or 3,000 lb, whichever is greater — 1926.502(e)(2) |
| Body belt allowed? | No — prohibited since Jan 1, 1998 | Yes | Yes — 1926.502(e) |
| Clearance below matters? | Critically | Not applicable — no fall | Only for the 2-ft free fall |
The confusion is not academic. A positioning lanyard is short, has no energy absorber, and is anchored to a point rated for 3,000 pounds or twice the impact load; used as a fall arrest connector it transmits forces well above the 1,800-pound limit in 1926.502(d)(16)(ii) into a worker's hips. A fall arrest rig used for positioning leaves the worker hanging all shift on a shock pack that was never designed to be loaded continuously, and connected at the dorsal ring where they cannot see or reach their own work. Each system's anchorage, attachment point and free-fall limit exist because of what it is for.
If you can choose, choose restraint. A system that makes the fall impossible removes the anchorage strength argument, the clearance calculation, the rescue plan and the suspension trauma risk all at once. It is the closest thing to a guardrail that a worker can wear.
2 Positioning device systems — 1926.502(e)
A positioning device system is the rebar worker's rig: a belt or harness with a short adjustable lanyard on each hip, hooked into the mat so the worker can lean back and tie steel with both hands. 1926.501(b)(5) is the only duty paragraph that accepts it, and only for work on the face of formwork or reinforcing steel.
- (e)(1) — Positioning devices shall be rigged such that an employee cannot free fall more than 2 feet.
- (e)(2) — The system shall be secured to an anchorage capable of supporting at least twice the potential impact load of an employee's fall, or 3,000 pounds, whichever is greater.
- (e)(3)-(e)(4) — Connectors shall be drop forged, pressed or formed steel or equivalent, with a corrosion-resistant finish and smooth surfaces and edges.
- (e)(5) — Connecting assemblies shall have a minimum tensile strength of 5,000 pounds.
- (e)(6) — D-rings and snaphooks shall be proof-tested to a minimum tensile load of 3,600 pounds without cracking, breaking or taking permanent deformation.
- (e)(7)-(e)(8) — Snaphooks sized to prevent unintentional disengagement or of the locking type; as of January 1, 1998, only locking type snaphooks; and the same prohibitions on connecting directly to webbing, to each other, to an occupied D-ring, to a horizontal lifeline, or to incompatibly shaped objects.
- (e)(9) — Positioning device systems shall be inspected prior to each use for wear, damage and other deterioration, and defective components removed from service.
3 Travel restraint
Subpart M does not use the phrase "travel restraint." The general industry rule does: 29 CFR 1910.140(b) defines a travel restraint system as a combination of an anchorage, anchorage connector, lanyard or other means of connection, and body support that the employer uses to eliminate the possibility of an employee going over the edge of a walking-working surface. 1910.28 names travel restraint as an acceptable system in several situations, and 1910.140(c)(14) requires travel restraint lines to sustain a tensile load of at least 5,000 pounds.
On a construction site, restraint is still usable — it simply has to be justified against the paragraph you are working under. If a worker cannot physically reach an unprotected edge, there is no exposure to a fall from that edge, and OSHA has long recognized restraint on that basis. What it demands of you is discipline: the length of the connection has to be measured against the geometry of the roof, and it has to keep working when the worker moves along the surface, which is where fixed-length restraint becomes awkward and rope grabs on a properly engineered anchor line become the practical answer.
4 Where body belts still live
Body belts are prohibited as part of a personal fall arrest system — in construction since January 1, 1998, and in general industry by 1910.140(d)(3). They remain acceptable in two places.
First, in positioning device systems under 1926.502(e), and in restraint. A belt at least 1⅝ inches wide, per 1926.502(d)(22).
Second — and this catches people out — in aerial lifts. 1926.453(b)(2)(v) requires that a body belt shall be worn and a lanyard attached to the boom or basket when working from an aerial lift. OSHA's note to that paragraph explains the logic: a body belt is acceptable there as part of a tethering or restraint system under 1926.502(e), not as fall arrest. The lift's basket, not the harness, is the primary protection; the tether stops you being thrown out.
The same paragraph, (b)(2)(iv), is worth quoting because it is violated on every second job: employees shall always stand firmly on the floor of the basket, and shall not sit or climb on the edge of the basket or use planks, ladders, or other devices for a work position.
5 Climbing: ladder safety systems and fixed ladders
Climbing is its own problem, and Subpart M mostly hands it to other standards.
For portable ladders, 1926.1053 sets no fall arrest requirement at all. It controls the setup and the behavior instead: side rails extending at least 3 feet above the upper landing surface or a grabrail where that is not possible ((b)(1)); non-self-supporting ladders set so the horizontal distance from the top support to the foot is approximately one quarter of the working length — the 4-to-1 rule ((b)(5)(i)); the top or top step of a stepladder not used as a step ((b)(13)); inspection by a competent person for visible defects on a periodic basis and after any occurrence that could affect safe use ((b)(15)); defective ladders immediately marked or tagged "Do Not Use" ((b)(16)); at least one hand used to grasp the ladder while climbing ((b)(21)); and no carrying of a load that could cause loss of balance ((b)(22)).
For fixed ladders in general industry, 1910.28(b)(9) sets a schedule worth knowing because it is running out. Fixed ladders extending more than 24 feet above a lower level require a personal fall arrest system, a ladder safety system, a cage or a well — with cages and wells acceptable only on older installations. Ladders installed on or after November 19, 2018 must have a personal fall arrest system or a ladder safety system; when any section of an existing ladder is replaced, the replacement must be so equipped; and on and after November 18, 2036, all fixed ladders must have a personal fall arrest system or a ladder safety system.
A ladder safety system — a rail or cable with a sleeve that travels with the climber — connects to the harness at the front, not the back, which is one of the few legitimate uses of a sternal D-ring. Follow the manufacturer's instructions for which connection point their sleeve is rated to use.
- Arrest catches a fall, restraint prevents one, positioning holds you at a wall. They are not interchangeable and their anchorage and free-fall limits differ.
- Positioning devices: no more than 2 feet of free fall, anchorage at twice the potential impact load or 3,000 pounds — whichever is greater — 1926.502(e)(1) and (e)(2).
- Positioning is accepted as a duty-satisfying system in only one place: formwork and reinforcing steel, 1926.501(b)(5).
- Travel restraint is defined in 1910.140(b) and its lines must sustain 5,000 pounds (1910.140(c)(14)); on a construction site it works when the geometry genuinely prevents reaching the edge.
- Body belts: never for arrest, acceptable for positioning and restraint, and required by 1926.453(b)(2)(v) with a lanyard to the boom or basket in an aerial lift.
- Fixed ladders over 24 feet: personal fall arrest or a ladder safety system on installations from November 19, 2018, and on all fixed ladders from November 18, 2036 — 1910.28(b)(9).
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