At what height is fall protection required in general industry?

Four feet. Under OSHA 1910.28, employers must protect workers on a walking-working surface with an unprotected side or edge 4 feet or more above a lower level. This is lower than the 6-foot trigger for construction under 1926 Subpart M. Fall protection is also required at any height over dangerous equipment.

Why is the general industry trigger 4 feet but construction is 6 feet?

They are separate OSHA standards written for different work. General industry (fixed workplaces like plants and warehouses) falls under 1910 Subpart D with a 4-foot trigger, while construction falls under 1926 Subpart M with a 6-foot trigger. The same worker can be covered by either rule depending on the task being performed.

What are the options for fall protection?

In order of preference: eliminate the exposure, then guardrail systems, then safety net systems, then personal fall protection such as travel restraint, positioning systems, and personal fall arrest. Guardrails are passive and protect everyone automatically; personal fall arrest depends on correct use every time, so it sits at the bottom of the hierarchy.

What did the 2016 walking-working-surfaces rule change?

The 2016 final rule (effective January 2017) let general-industry employers choose from the full menu of fall protection systems, required full-body harnesses and phased out body belts for fall arrest, began phasing out cages on fixed ladders over 24 feet in favor of ladder safety or personal fall arrest systems, and added inspection and training requirements.

What is the difference between fall restraint and fall arrest?

Travel or fall restraint keeps a worker from reaching the edge, so a fall cannot happen. Fall arrest catches a worker after they have gone over the edge, using an anchorage, full-body harness, and connector. Restraint is preferred because it prevents the fall; arrest requires calculating fall clearance and having a rescue plan.

Do you need fall protection over a mixer or open tank?

Yes, at any height. OSHA requires protection from falling into or onto dangerous equipment regardless of the 4-foot rule, because a fall of even a short distance into a mixer, open-surface tank, or moving machinery is serious. Guarding, covers, or personal fall protection must be provided.

How often should fall arrest harnesses be inspected?

Personal fall arrest equipment should be inspected by the user before each use for cuts, frays, chemical damage, and hardware defects, and inspected on a documented schedule by a competent person. Any equipment that has arrested a fall must be removed from service. The 2016 rule also added surface inspection and worker training requirements.

Fall Protection in General Industry

The 4-foot trigger, why it is lower than construction's 6 feet, and how the 2016 walking-working-surfaces rule reshaped the options.

In general industry, OSHA's walking-working-surfaces rule (29 CFR 1910 Subpart D) requires fall protection at 4 feet above a lower level: guardrails, safety nets, or personal fall protection at every unprotected side, edge, hole, or open platform. Construction's trigger is 6 feet.

Falls are consistently among the top causes of workplace death, and in a plant the exposure is easy to overlook because nobody thinks of a mezzanine edge or an open floor hole as "working at height." It is not scaffolding; it is the loading dock edge, the pit someone left uncovered, the top of a mixer reached by a fixed ladder. This post covers general-industry fall protection, how it differs from construction, and what the 2016 rule changed, using OSHA's standard as the reference. It is educational, not legal advice.

At what height does general industry require fall protection?

Four feet. Under 29 CFR 1910.28 the employer must protect each employee on a walking-working surface with an unprotected side or edge that is 4 feet or more above a lower level. That is the number that surprises people who know the construction rules, where the trigger is 6 feet under 29 CFR 1926 Subpart M. Same company, same worker, different height trigger depending on whether the task is general industry or construction.

The general-industry trigger (4 feet) is lower than construction's (6 feet). Over dangerous equipment, such as an open tank or machinery, fall protection is required regardless of height.

Height is not the only trigger. Regardless of the 4-foot rule, you must protect workers from falling into or onto dangerous equipment at any height, and you must guard every floor hole and wall opening a person could fall through.

What counts as a fall hazard in a plant?

More than the obvious edges. The standard reaches a list of surfaces that plants often leave unguarded because they do not look like heights:

Unprotected sides and edges of platforms, mezzanines, and walkways 4 feet or more up.
Holes in floors and walls, including skylights and pits, that a worker or a foot could go through.
Open-sided platforms, runways, and ramps, and the edges of loading docks where the exposure is constant.
Dangerous equipment, such as open-surface tanks, mixers, and conveyors, where a fall of any height is serious.
Stairways and fixed ladders, which have their own guarding and cage-or-system requirements.

What are your fall protection options?

The standard gives a menu, and the order matters: it is a hierarchy, not a free choice. Eliminating the exposure or guarding it passively is always better than strapping a worker to an anchor and trusting the system in a real fall.

The fall protection hierarchy. A guardrail protects everyone who walks the edge without any action on their part; personal fall arrest depends on a worker donning, connecting, and anchoring correctly every time.

Guardrail systems with a top rail at 42 inches (plus or minus 3), a midrail, and a toeboard where things could fall on people below. Passive protection: nobody has to remember to use it.
Safety net systems strung below the work to catch a fall.
Personal fall protection systems: travel restraint that keeps the worker from reaching the edge, positioning systems, and personal fall arrest systems that stop a fall in progress with an anchorage, a body harness, and a connector.

Personal fall arrest is the most visible option and the least forgiving. It only works if the anchorage holds, the harness fits, the lanyard length and clearance are calculated, and someone can rescue a suspended worker fast. That is why it sits at the bottom of the list, not the top.

What changed in the 2016 walking-working-surfaces rule?

OSHA's walking-working-surfaces final rule published in November 2016 and effective January 2017, was the biggest general-industry fall protection update in decades. The changes plants most need to know:

Employer choice of systems. The rule aligned general industry with construction by letting employers pick from the full menu of fall protection options for a given hazard, rather than mandating one method.
Body belts are out for fall arrest. Personal fall arrest systems must use a full-body harness; body belts are no longer permitted to arrest a fall.
Fixed-ladder transition. Cages are being phased out as the fall protection method on fixed ladders over 24 feet; new ladders need ladder safety systems or personal fall arrest, and existing cages must be converted on OSHA's timeline running to 2036.
Inspection and training. The rule added requirements to inspect walking-working surfaces and to train workers who use personal fall protection and who work around fall hazards.

How do you build a fall protection program?

Treat the plant as a set of surfaces, not a set of tasks, and work the hierarchy.

Survey every walking-working surface for unprotected edges 4 feet or more up, floor holes, skylights, open platforms, dock edges, and equipment you could fall into. Map them.
Eliminate or guard first. Where you can, remove the exposure or install permanent guardrails and hole covers, so protection does not depend on anyone remembering to clip in.
Select systems for what remains, matching guardrail, net, travel restraint, or fall arrest to each hazard, and preferring travel restraint (which prevents the fall) over arrest (which catches it).
Engineer the fall arrest details. Certify anchorages, calculate fall clearance and swing fall, specify harnesses and connectors, and have a competent person sign off.
Write a rescue plan. A worker hanging in a harness needs to be recovered in minutes, so plan and equip the rescue before the work, not during the emergency.
Inspect and train. Inspect surfaces and equipment on a schedule, inspect harnesses and lanyards before each use, and train everyone who works at height or around fall hazards.

How much clearance do you need below a fall arrest system?

More than people expect, and getting it wrong turns a fall arrest system into decoration. When the system stops a fall, the worker keeps dropping for a distance before it fully engages, and if there is not enough clear space below, they hit the lower level anyway. The clearance you need is a sum of several pieces:

Free fall distance before the deceleration device starts to engage, kept short by anchoring high.
Deceleration distance, the length a shock-absorbing lanyard or self-retracting device pays out while slowing the fall.
Harness stretch and D-ring shift, plus the height of the worker below the D-ring.
A safety margin down to the lower level or the nearest obstruction.

Add those up and even a short fall can need several feet of clearance below the anchor. The related trap is swing fall: if the anchor is off to the side rather than overhead, a fall becomes a pendulum that swings the worker into whatever is in the arc. Anchor overhead and directly above the work whenever you can, and calculate clearance before anyone clips in, not after.

Clearance and swing are also why a rescue plan is not a formality. A worker left hanging in a harness can develop suspension trauma within minutes as blood pools in the legs and stops circulating, so the plan has to recover them fast, with rescue equipment staged nearby and people trained to use it before the work begins. "Call 911 and wait" is not a rescue plan when the clock is that short. Decide in advance who performs the rescue, how they reach the worker, and how the worker is lowered or raised to safety.

What do the numbers say?

The scale and the primary sources:

Falls, slips, and trips are consistently one of the leading causes of fatal workplace injury; falls to a lower level make up a large share of the total, per the Bureau of Labor Statistics' Census of Fatal Occupational Injuries.
OSHA's walking-working-surfaces standard and its fall-prevention resources set the general-industry requirements and the 2016 rule updates.
The duty to have fall protection, including the 4-foot trigger, is in 29 CFR 1910.28.

The recurring finding in fatal-fall investigations is not exotic: an edge that could have been guarded, a hole that was left open, or a harness that was available but not anchored to anything.

Where the hazard hides in the paperwork

Anchorage certifications, harness inspection tags, and surface surveys live in binders and on nylon tags that get initialed whether the webbing was really checked or not, and the rescue plan is theoretical until it is needed. Harmony is an AI-native layer that connects machines, software, and paperwork into one operational layer, with no rip-and-replace: surface surveys, anchorage records, and pre-use harness inspections become structured data captured on tablets, part of the everyday shape of connected worker technology. AI search returns cited answers, so an out-of-date anchorage inspection surfaces as a task instead of a surprise, and Harmony's digital workflows route each open guarding or inspection finding to the person who owns the fix. It is not a fall-protection product; it keeps the survey and the inspection from lapsing on a shelf. Elevated work reached by a truck ties into your forklift safety rules on personnel platforms, and every at-height task belongs in its job safety analysis; an unguarded edge flagged on rounds is a near miss and a finding for the next safety audit and it belongs in your OSHA recordkeeping if someone is hurt.