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• Heavy Loads- evacuation:
accompanied descent (pick-off).
Maximum load 200 kg (440 lbs).
Employing rope ≥ 10.5 mm.
• Heavy Loads- evacuation: lowering
from an anchor point. Maximum load
250 kg (551 lbs). Employing rope ≥
10.5 mm. Requirements include:
 Italian Hitch must be employed
on an additional braking
carabiner where the rope enters
the device.
 Two person operating technique-
one operates I’D S and the other
holds the rope entering the Italian
Hitch and I’D. Figure 45- I’DS showing positions of function. Original
image © Petzl.
Note: Petzl user instructions state; “For heavy loads, shock loading
must be avoided.”

Although the manufacturer permits the use of the I'D S in controlled circumstances with
a two person load, the parameters are restricted. This includes not permitting a shock
load, which may be impractical to assure during a rescue. Due to the manufacturer
restrictions, and inability to handle a shock load, the I’D S should not be considered a
practical two-person belay device for technical rope rescue
operations.

Petzl RIG
Petzl also produces the RIG, which is a more compact self-
braking descender, than the I’D, designed for rope access
work (Figure 46). Incorporates many of the same features
as the I’D, including a safety gate on the side plate, allowing
opening of the RIG without completely disconnecting it from
the rescuer’s harness.

Petzl states the RIG can be used for rescue evacuation as
a lowering device (suspended from an anchor point and
employing a second braking carabiner) with a maximum Figure 46- Petzl RIG Descender.
150 kg (330 lbs) mass. This however does not meet the © Petzl.

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