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shape (open style), which has attachment eye along one of the legs of the inverted "U"
frame. The second popular style is the closed rack, which is also "U" shaped, but the
base of the "U" serves as the attachment point (Figure 43). The rappel rack is the
recommended tool of choice for many technical rope rescue applications including
conducting pick-offs and lowering rescue loads.

Petzl I'D
The Petzl I'D (Industrial Descender) is
advertised as a self-braking descender/braking
device, and was developed from the basic
design and features of the smaller Petzl Grigri
(Figure 44). Descent is controlled by pulling on
the control handle while keeping hold of the
rope with the opposite hand. The I'D handle
has a range of positions that include stop for
work positioning, descent and panic stop
(Figure 45). Petzl manufacturers the I’D S and
I’D L models. The I’D S has an internal safety
catch (not found on the ID’L model), which
reduces the chance of an accident associated
with threading the rope improperly into the
device. A safety gate is located on the side
plate, which permits opening the I’D S without

completely disconnecting it from the rescuer’s Figure 44- Nomenclature of Petzl I'D S parts.

harness. On slopes with a light load, the panic Original image © Petzl.
brake activates easily. This is overcome with
a button on the end of the control handle allows for easier travel in non-vertical
situations. The I’D can also be employed in a reversible haul system for short ascents
by a rescuer, when combined with a single ascender.
The I’D S (part # D20S) operates with 10mm to 11.5mm rope diameters (I’D L is
designed for use with ropes 11.5 mm to 13mm). The I’D S meets NFPA 1983 (2012
edition) for “Technical Use” as a DCD. Additionally the device is certified to meet CE EN
341 class A and CE EN 12841 type C. The rated strength is 14 kN (3,147 lbf) MBS and
weighs 530 g (18 oz).

An important point is that Petzl has published the following manufacturer operating
45
limitations :
• Rescue evacuation 150 kg (330 lbs)
Additionally Petzl states for the following- “Exceptional uses for experts only”;

45 Petzl. Technical Guide- I’D S. 2013

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