3M DBI SALA Longes en sangle Manuel De L'utilisateur page 4

F. To any object which is shaped or dimensioned such that the snap hook or carabiner will not close and
lock, or that roll-out could occur.
G. In a manner that does not allow the connector to align properly while under load.
Figure 3 Unintentional Disengagement and Inappropriate Connections
If the connecting element to which a snap hook (shown) or carabiner
attaches is undersized or irregular in shape, a situation could occur
where the connecting element applies a force to the gate of the snap
hook or carabiner. This force may cause the gate (of either a self-
locking or a non-locking snap hook) to open, allowing the snap hook or
carabiner to disengage from the connecting point.
Small ring or other
non-compatibly
shaped element
Force is applied to the
Snap Hook.
2.4 ANCHORAGE STRENGTH: The anchorage strength required is dependent on the application type. The
following are the requirements of ANSI 359.1 for these application types:
A. FALL ARREST: Anchorages selected for fall arrest systems shall have a strength capable of sustaining
static loads applied in the directions permitted by the system of at least:
1. 5,000 lbs. (22.2 kN) for non-certified anchorages, or
2. Two times the maximum arresting force for certified anchorages. When more than one fall arrest
system is attached to an anchorage, the strengths set forth in (1) and (2) above shall be multiplied by
the number of systems attached to the anchorage.
B. WORKING POSITIONING: Anchorages selected for work positioning systems shall have a strength
capable of sustaining static loads applied in the directions permitted by the system of at least:
1. 3,000 lbs. (13.3 kN) for non-certified anchorages, or
2. Two times the foreseeable force for certified anchorages. When more than one work positioning
system is attached to an anchorage, the strengths set forth in (1) and (2) above shall be multiplied by
the number of systems attached to the anchorage.
C. RESTRAINT: Anchorages selected for restraint and travel restraint systems shall have a strength
capable of sustaining static loads applied in the directions permitted by the system of at least:
1. 1,000 lbs. (4.5 kN) for non-certified anchorages, or
2. Two times the foreseeable force for certified anchorages. When more than one restraint and travel
restraint system is attached to an anchorage, the strengths set forth in (1) and (2) above shall be
multiplied by the number of systems attached to the anchorage.
D. RESCUE: Anchorages selected for rescue systems shall have a strength capable of sustaining static
loads applied in the directions permitted by the system of at least:
1. 3,000 lbs. (13.3 kN) for non-certified anchorages, or
2. Five times the foreseeable force for certified anchorages. When more than one rescue system is
attached to an anchorage, the strengths set forth in (1) and (2) above shall be multiplied by the number
of systems attached to the anchorage.
WARNING: Anchorages used for restraint, rescue, or suspension may only be used where there is no possible
vertical free fall. These anchorages do not have sufficient strength for work positioning or fall arrest. Do not
connect work positioning or fall arrest systems to these anchorages. Anchorages intended for work positioning
may not be suitable for use with fall arrest systems (fall greater than 2 feet (.6 m)) and should not be used for
fall arrest unless specifically designed to do so.
The Gate presses against The Gate opens allowing
the Connecting Ring. the Snap Hook to slip off.
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