Operating Principle; Prohibited Use - Tractel B1.8A ESD Manual De Instalación, Utilización Y Mantenimiento

– 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).
GB – 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 for further information.
®
Note: the blocfor™ self-retracting fall-arrester in
horizontal use has not been tested in combination with
a lifeline compliant with EN 795 Class C.

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.
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
6. Clearance
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.

7. Prohibited use

Figure 2.
It is strictly forbidden:
• to install or use the blocfor™ self-retracting fall-
arrester without first having been authorised, trained
and recognised to be qualified in the use of the device,
or otherwise, without the supervision of an authorised
operator, trained and recognised to be qualified in use
of the device.
• to use the blocfor™ self-retracting fall-arrester if any
of the markings are not legible.
• to install or use the blocfor™ self-retracting fall-
arrester without first having carried out the preliminary
checks.
• to use a blocfor™ self-retracting fall-arrester which
has not been covered by a periodical inspection over
the past 12 months by a technician having authorised
re-use in writing.
• to connect the blocfor™ self-retracting fall-arrester to
a point which has not been covered by a periodical
inspection over the past 12 months by a qualified
technician having authorised re-use in writing.