3.6
Personal Fall Arrest System Anchorage Strength:
An anchorage selected for a PFAS must have the strength to sustain a static load applied in
the direction permitted by the PFAS of at least two times the maximum arrest force permitted when certification exists, or 5,000 lbs. (22.2 kN) in
the absence of certification.
3.7 Definitions:
The following are definitions of terms as defined in ANSI Z359.0-2012.
Authorized Person:
A person assigned by the employer to perform duties at a location where the person will be exposed to a fall hazard (otherwise
referred to as “user” for the purpose of these instructions).
Certified Anchorage:
An anchorage for fall arrest, positioning, restraint, or rescue systems that a Qualified Person certifies to be capable of
supporting the potential fall forces that may be encountered during a fall or that meet the criteria for a certified anchorage prescribed in this
standard.
Competent Person:
One who is capable of identifying existing and predictable hazards in the surroundings or working conditions which are
unsanitary, hazardous, or dangerous to employees, and who has authorization to take prompt corrective measures to eliminate hazards.
Harness Stretch:
Amount of vertical travel of the Full Body Harness D-ring during a fall arrest.
Qualified Person:
A person with a recognized degree or professional certificate and with extensive knowledge, training, and experience in the fall
protection and rescue field who is capable of designing, analyzing, evaluating and specifying fall protection and rescue systems to the extent
required by this standard.
Rescuer:
Person or persons other than the rescue subject acting to perform an assisted rescue by operation of a rescue system.
4. INSTALLATION AND USE
WARNING
Do not alter or intentionally misuse this equipment. Consult FallTech when using this equipment in combination with components or
subsystems other than those described in this manual.
Do not connect rebar hooks, large carabiners, or large snap hooks to the FBH dorsal D-rings as this may cause a roll-out condition and/or
unintentional disengagement.
Use caution. Take action to avoid sharp and/or abrasive surfaces and edges.
Avoid electric hazards. Use caution when performing arc welding. Arc flash from arc welding operations, including accidental arcs from electrical
equipment, can damage equipment and are potentially fatal.
Examine the work area. Be aware of the surroundings and workplace hazards that may impact safety, security, and the functioning of fall arrest
systems and components. Hazards may include but not be limited to cable or debris tripping hazards, equipment failures, personnel mistakes,
moving equipment such as carts, barrows, fork lifts, cranes, or dollies. Do not allow materials, tools or equipment in transit to contact any part
of the fall arrest system. Pay special attention to the lifeline. Do not work under suspended loads.
4.1. Plan the Personal Fall Arrest System (PFAS):
Inspect the SRD before each use in accordance with the procedures detailed in Section 7. Examine
the work area and take action to address hazards. Falls are a serious hazard when working at height. Training and equipment are the tools of fall
hazard management. There are several closely related facets of fall hazard management with a PFAS;
•
Anchorage
•
Minimum Required Fall Clearance (MRFC)
•
Overhead (Above the D-ring) Anchorage Condition
•
Non-Overhead (Below the D-Ring) Anchorage Condition:
•
Swing Fall
•
Overhead (above the FBH D-ring) Anchorage and Swing Fall
•
Non-overhead (Below the FBH D-ring) Anchorage and Swing Fall
4.2 Anchorage:
Select a suitable anchor point. See paragraph 3.6. In addition to strength and load requirements, consider the height of the
anchorage, the distance between the anchorage and the user’s FBH dorsal D-ring, the distance between the anchorage and the walking/working
surface, and the distance between the walking/working surface and any obstructions below it, including the lower level or ground.
Also consider the area where the work is being performed. In an overhead anchorage condition, the area below the anchorage is the work zone. In
a below the D-ring anchorage condition, the work zone is from the anchor point to the end of the lifeline. Lateral movement away from the
anchorage is hazardous. As distance from the anchor increases, the work zone expands, and so does the hazard. Work zone expansion is measured
in feet and has a direct influence on user safety. Always work as close to the anchor as possible.
4.3 Minimum Required Fall Clearance:
The MRFC is the minimum distance a user needs between himself and the nearest obstruction (or ground)
below the walking/working surface to avoid serious injury or death in case of a fall event. The user of this equipment must determine the MRFC for
the equipment discussed in this manual to ensure adequate clearance exists in the fall path. Variables discussed in this manual include the height
of the anchor point relative to the user’s FBH D-ring, i.e., overhead or non-overhead anchorage condition, plus swing fall and how an expanded
work zone affects these variables. See paragraph 2.3.1 for information regarding overhead and non-overhead anchorages, and paragraph 4.4 for
information regarding swing fall.
4.3.1 MRFC For Overhead (Above the D-ring) Anchorage for 310 lb. User Capacity:
The MRFC for an overhead 310 lb. capacity anchorage has six
parts, labeled A, B, C, D, E, and F, measured from the walking/working surface, as shown in Figure 3A.
A = SRD deceleration distance
B = D-ring shift and harness stretch
C = Safety factor
D = Sub Total – Minimum Required Fall Clearance
E = Additional Fall Clearance Calculation Due to Swing Fall . See paragraphs 4.4 and 4.4.1.
F = Total Required Fall Clearance
The MRFC for an overhead anchorage is calculated as A+B+C = D.
The user must be aware that if a swing fall hazard exists, additional steps are required. Use Chart 1 to determine the amount of swing fall, and
place that value in E. Add the E value to the D value to determine F, the total MRFC.
4.3.2 MRFC Non-Overhead (Below the D-Ring) Anchorage for 310 lb. User Capacity:
The MRFC for a non-overhead 310 lb. capacity anchorage has
eight parts, labeled A, B, C, D, E, F, G, and H, measured from the walking/working surface, as shown in Figure 3B.
4
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