HORIZONTAL SYSTEMS
Horizontal Systems Defined
Horizontal systems are linear, traversable anchorage systems, allowing one or more users to remain continuously tied-off as they negotiate an adjacent hazard. The most common type is the Horizontal Lifeline. Horizontal Lifelines or HLL's, are commonly used for fall arrest and fall restraint, and are most often used in work areas that lack existing anchor points for personnel to safely tie off to. In it's simplest form, a horizontal lifeline consists of a cable attached to two or more anchor points on any elevated work area where a fall risk to personnel exists (an actual engineered system is significantly more complex in terms of componentry). They can be positioned in a variety of locations, dependent upon the environment. When used in combination with a Personal Fall Arrest System, an HLL can arrest a fall and limit the amount of force that is transferredboth to theworker and to the fall arrest system.Thissamecombination of horizontal lifeline, harness, and connecting device can also serve as a fall restraint system (using a static lanyard as opposed to an SRD), limiting the worker’s ability to move close enough to fall over an unprotected leading edge. The fall restraint and fall arrest properties of horizontal lifelines make the HLL an integral part of many fall protection systems. In any compliant fall arrest scenario, the free-fall distance must be limited to 6 feet, and the deceleration distance must not exceed 42 inches. Lifeline elongation; however, is NOT included in deceleration distance; and the total fall distance is unregulated - except that the employee cannot make contact with a lower level.
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