Vertical Use; Operating Principle - Tractel blocfor ESD Manuel D'installation

A on 0.5 mm radius edge minimum. see technical
specification table above.
GB If the user must deviate more than 1.50 m from the
perpendicular to the anchor point of the blocfor™ self-
retracting fall arrester, it is imperative to use an anchor
that complies with standard EN 795 of type C or D.
Horizontal use is prohibited for blocfor™ 2 ESD2
ESD and all blocfor™ devices with stainless steel
cable.
If the arrest is considered to be cutting, or if there
is a sharp edge present, take all possible
precautions to avoid a fall and use edge protection
where this isn't possible.
Before using the blocfor™ self-retracting fall-arrester,
check (figures 1.d and 1.f):
– Check that the blocfor™ self-retracting fall-arrester
anchor point is located at the same height or above
the edge.
– Check that the angle formed by the lanyard in
contact with the edge, in the event of a fall, is less
than 90° (figure 1.f bis).
– The distance between the anchor point of the
blocfor™ self-retracting fall-arrester device and
the edge (L min) must conform with the technical
specifications in table above (figure 1.f).
– To reduce the risk of swinging, the movement of
the operator is limited to a maximum distance of
lateral displacement perpendicular to the edge
(Max M) which must conform with the technical
specification table above (figure 1.d).
– That there is no obstacle under the suspension /
swing area in the event of a fall.
– Check that a specific rescue plan has been set up
in the event of a fall.
– That the roofs do not show any possibility of
weakness (fibro-cement, etc.) if in any doubt,
install a solid path of movement compatible with
the roof.
– There are other possible cases that are not included
in this list. There are numerous other possibilities
that we cannot either list or foresee. In the event of
doubt or misunderstanding of this manual please
contact Tractel

5. Operating principle

blocfor™ self-retracting fall-arrester ESD:
In the event of a fall, the mechanism located inside the
blocfor™ self-retracting fall-arrester instantaneously
locks by means of a ratchet system and the fall is
stopped gently by a tear-type energy absorber with
a stop value of less than 6 kN. When climbing and/
or descending, the lanyard operator is maintained
tensioned by the return spring.
6
for further information.
®
In addition the blocfor™ ESD automatic retraction fall
arrester is fitted with a safety system guaranteeing that
the fall of an operator is stopped in all safety even if the
fall occurs when the strap or the rope has completely
come out of the blocfor™ ESD automatic retraction fall
arrester.
blocfor™ R ESD self-retracting fall-arrester:
The operating principle of the recovery function is
detailed in the attached instructions specific to the
blocfor™ 20R and 30R ESD – EN 360 - EN 1496
class B Self-retracting fall-arrester with lifting rescue
device §5.
6. Clearance
If this equipment is connected to an EN 795 class C
lifeline, it is imperative to add the maximum deflection
of the anchor point defined in the instructions for use of
the anchor point to the draft (values below).

6.1. Vertical use

The air clearance H (figure 1.g) is the free space under
the feet of the operator. It is defined by the formula:
H = 3 m + Hp
which breaks down as follows:
3 m = height of fall with the blocfor™ self-retracting fall-
arrester: 2 metres + 1 meter security.
Hp = maximum deflection of the anchor point defined in
the instructions for use of the anchor point.
6.2. Horizontal use
The vertical clearance H (figure 1.h) is the free space
below the operator during horizontal use. This is
defined by the formula below:
H = 4 m + Hp
which breaks down as follows:
4 m = fall height with the blocfor™ automatic retraction
fall arrester in horizontal use: 3 metres + 1 metre for
additional safety.
Hp = the maximum anchor point deflexion as defined in
the anchor point usage manual.