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It is also possible to use the cabinet without
mechanical exhaust air. However, it is important to
note the following:
•
The cabinet must be connected to earth to
prevent electrostatic charging (see section on
earthing).
•
There is a zone 1 explosive area inside the
cabinet.
•
There is a zone 2 explosive area within a radius
of 2.5 m around the cabinet and up to 0.5 m
above the floor. This area must be marked in
accordance with the Accident Prevention Regu-
lations (BGV A8):
•
In general, the national rules, laws and regula-
tions must also be observed here.
i
Important!
A mechanical ventilation system is man-
datory for the storage of highly flammable
liquids (H224).
•
In mechanically ventilated work rooms with
at least five air changes per hour, the zone 2
explosive area can be reduced to 1 m in front of
the safety cabinet and 0.5 m at the side of the
safety cabinet and to a height of 0.3 m above
the floor.
11. Grommets
Cable grommets can be installed in the cabinet
ceiling; see accessories for the order number. The
positions are marked on the cabinet as
Model
12/20 Type 90
6/20 Type 90
B
B
12. Earthing
The safety cabinet has a standard earth connec-
tion
on the ceiling.
C
C
Equipotential bonding must be installed by quali-
fied personnel. Check the conductivity after instal-
lation!
.
B
B
Number of grommets
2
1
B
B
C
C
GB
C
C
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