What 29 CFR 1910.28 requires (plain English)
29 CFR 1910.28 establishes the duty to provide fall protection in general industry: the "where and when" of protecting workers on walking-working surfaces. It is the general-industry mirror of construction's 1926.501, but with a lower trigger height: 4 feet above a lower level rather than 6. It was rewritten as part of OSHA's 2016 Walking-Working Surfaces final rule, which modernized decades-old requirements and, for the first time, let general-industry employers use personal fall protection systems in place of guardrails.
The core duty: where a worker is on a walking-working surface with an unprotected side or edge 4 feet or more above a lower level, the employer must protect them with a guardrail system, a safety net system, or a personal fall protection system (fall arrest, travel restraint, or positioning). The standard then sets specific duties for holes, hoist areas, dockboards, runways, stairways, ladders, and dangerous equipment: several with their own trigger conditions independent of the 4-foot rule.
1910.28 is the duty section; the criteria those systems must meet (guardrail heights, anchorage strength) live in 1910.29, and the training workers must receive lives in 1910.30, the same duty/criteria/training split as the construction 501/502/503 trio. One long-horizon requirement stands out: fixed ladders extending more than 24 feet must have a personal fall arrest or ladder safety system, with cages and wells phased out as the sole protection on all such ladders by November 18, 2036.