ABB UniSec SDS Installation Manuals page 35

D I S T R I B U T I O N S O LU T I O N S
Figure 77. Installed gas vent duct
3.6.2 Connecting the gas vent ducts
a) Install the lower locking bracket
b) Install the upper locking bracket bar and screw up
the screws (2 hexagonal bolts with flange M6x10)
Figure 79 shows an additional duct and end plate.
Figure 78. Upper locking bracket
Figure 79. Connected gas vent duct; additional duct and end plate
Connecting these parts can be done in the same way
as in the previous stages. An additional duct is used
in the end unit to direct any gas due to arc faults out
of the switchgear room.
The switchboard is always provided with an
additional duct 1 metre long. On request an
additional duct with a maximum length of 2 metres
can be supplied.
In the case of 750 mm units:
a) Install the large bottom plate
b) Install the plate in the centre of the gas vent
ducts.
Example of lateral gas outlet
Figure 80. View from front
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