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WARNING:
It is important to take additional precautions while using this equipment in the presence of any
environmental hazards so as to prevent injury to the user or damage to the equipment.
•
Work Positioning: The structure to which the
work positioning system (WPS) is attached must
be able to sustain a static load of min. 3000 lbs.
(13.3 kN), applied in the directions permitted
by the work positioning system. Or, it should be
able to sustain two times the potential impact
load, whichever is greater; see OSHA 1926.502.
However, if more than one work positioning
system is attached to an anchorage, then the
strength mentioned above must be multiplied by
the number of WPS attached to the anchorage.
•
Restraint: The strength requirement of
anchorages which are selected for restraint
and travel restraint systems is min. of 1000 lbs.
(4.5 kN) static load applied in the directions
permitted by the system. If more than one
restraint and travel restraint system is attached
to anchorage, then the 1000 lbs. (4.5 kN) shall
be multiplied by the number of systems attached
to the anchorage to determine the min. strength
requirement.
•
Rescue: The minimum strength of the
anchorage selected for rescue should be such
that it is capable of sustaining a static load of
min. 3000 lbs. (13.3 kN) applied in the direction
permitted by the system. To determine the
strength requirement of the anchorage if
more than one rescue system is attached, then
multiply 3000 lbs. (13.3 kN) by the number of the
systems attached to the anchorage.
•
Swing Falls: Swing fall occurs when the
position of the anchorage point is not directly
above the point where a fall occurs. In such
a case if a fall were to occur, it will result in
pendulum swing of the fall victim and may also
cause them to strike nearby objects with a force.
This may cause serious injury or even death.
Such swing falls may be minimized by ensuring
that the anchorage is directly overhead, and
by working as close to the anchorage point as
possible. Swing falls will substantially increase
the fall clearance required when a SRL or other
variable length connecting device is used.
DEWALT
•
The Capacity of the
full body harness
is up to 420 lbs. (190 kg) hence, the combined
weight (clothes, tools, shoes etc.) of a person
using these harnesses should not be more than
420 lbs. (190 kg). It is important to ensure that
all the components in the system are rated to a
capacity which is appropriate to the application.
•
Free Fall: As per ANSI Z359.1-2020, the
personal fall arrest systems used with this
equipment must be rigged in such a way that
the free fall does not exceed 6 ft. (1.8 m). Ensure
that there is no slack in the lifeline, while using
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the SRL. Also, never extend the length of the
lifeline by connecting a lanyard to it. Class 1
SRL's can not be anchored below D-ring height
as this will increase free fall distance beyond
permissible levels. Additionally, this could also
cause excessive load impact on the SRL, thereby
exceeding its capabilities to safely arrest a fall.
Contact DEWALT for any further information
required.
•
Extended Suspension: Using a full body
harness: A FBH is not intended for use in
extended suspension applications. If the user is
going to be suspended for an extended length
of time, it is recommended that some form of
DEWALT
a seat support be used.
recommends
a seat board, suspension work seat, seat sling,
DEWALT
or a boatswain chair. Contact
for more
information on these items.
14) GENERAL LIMITATIONS OF FALL
ARREST SYSTEM AND REQUIREMENTS
•
Corrosion: The SRL should not be left in
any environment for a long period of time,
if it causes corrosion of its metal parts. It is
important to be cautious while working around
corrosive substances like sea water, ammonium
compounds, sewage, fertilizers, and other such
environments. Corrosive damage impacts the
performance of the SRL, hence the inspection of
the SRL should be performed more frequently so
as to check its functioning and performance.
•
Locking Speed: The SRL requires an initial
speed of acceleration of the line to cause it to
lock. However, this speed may not be achieved
if there is an obstructed fall, or while working in
confined spaces. Working in such conditions may
limit the speed at which the locking of the SRL is
achieved. Special care is required where the SRL
is used while working on low-pitched roofs. Here
the user may slide on the roof slope, rather than
have a direct fall. This could also hamper the
SRL locking mechanism. A clear path is required
to ensure that the SRL's locking mechanism is
activated.
• Fall Clearance: There should be sufficient
clearance below the user to allow the system
to arrest a fall so as to prevent the user from
striking the ground or any other obstruction.
The clearance required is dependent upon the
following factors:
•
Anchorage location
•
Type of connecting subsystem used (energy
absorbing lanyard, SRL, etc.).
•
The minimum fall clearance required when
a SRL is used is six feet from the working
level, subject to the condition that the SRL
WARNING: The fall arrest system MUST ONLY be connected to the back attachment element on the harness
provided for the purpose ("D" ring or webbing attachment extension). The D-rings on the belt and the ventral
anchorage point must only be used for the attachment of a work positioning or retaining system and never with
a fall arrest system.
WARNING: During use, check regularly the adjustment and/or attachment points.
is attached directly over the head of the
worker.
•
Horizontal systems and Tripods: It is
extremely important to ensure that the tripod
or the Horizontal line system is compatible with
the SRL. Horizontal systems must be designed
and installed under the supervision of a qualified
person only.
•
Sharp edges: The lifeline of the SRL may be
damaged by unprotected and sharp edges,
hence they should be protected from all edges.
The DEWALT Leading Edge tested Class 2 SRLs
are designed in such a way that they provide
additional protection from falls occurring over
edges. However, protection to these Class 2 SRLs
should be provided from sharp edges such as
sheared, cold rolled or flame cut steel.
A
A
Connecting Subsystem (Self
Retracting Device Shown)
B
Working Level
C
Lower Level or Obstruction
B
D
Free Fall - 6 ft. (1.8 m) Max.
(per ANSI Z359.11-2021)
E
Deceleration Distance
F
Total Fall Distance Free Fall (D)
+ Deceleration (E)
C
CLASS 1 AND CLASS 2 SRL'S (WHEN USED
VERTICALLY) FALL CLEARANCE
Class 1- Where overhead anchorage is
available without swing fall.
•
2 ft. (0.61 m) – Free Fall Distance
•
2 ft. (0.61 m) – Maximum Arrest Distance
•
3 ft. (0.91 m) – Safety factor including
D-ring Slide, Harness stretches and buffer to
obstruction below
•
7 ft. (2.13 m) – Required Fall Clearance as
measured from the walking/working surface
to the nearest obstruction/ground below.
Class 2- Anchored at foot-level without
swing fall.
•
7 ft. (2.13 m) – Free Fall Distance
•
3.5 ft. (1.07 m) – Maximum Arrest Distance
•
3 ft. (0.91 m) – Safety factor including
D-ring Slide, Harness stretches and buffer to
obstruction below
•
5 ft. (1.52 m) – Height of worker
•
18.5 ft. (5.64 m) – Required Fall Clearance as
measured from the walking/working surface
to the nearest obstruction/ground below.
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