14 MNS-SG Operation and Maintenance | Manual
—
Exhaust plenum (optional)
2.
Exhaust plenum (optional)
The optional plenum will be shipped separately from the
switchgear. It must be assembled and installed onsite. The
switchgear will be shipped with temporary covers over the
busbar compartment of sections of the lineup to prevent
the entry of dirt or debris.
Following an arc flash, the equipment must be inspected
by a qualified service technician prior to putting the
switchgear back in service. Contact your local ABB
representative for assistance.
Wall-opening dimensions
After installing the plenum, reseal the gap according to NEC
and local regulations.
Temporary covers
Side and rear exhaust plenum configurations are available.
These two configurations may be converted if required.
Contact an ABB representative for additional parts needed
to convert the plenum.
NOTE:
The rear-exhaust plenum is not available with top-
cable-entry switchgear.
Before beginning the installation, identify the location
where the plenum will vent outside of the switchgear room.
The exhaust must be directed to a location where it will not
cause injury or damage. See Positioning Arc-Resistant
Switchgear.
Create the necessary opening in the wall.
Calculate the number of extensions that will be required to
connect the switchgear to the wall opening. Extensions are
available length sections of 9.8, 19.7, 31.5 and 39.4 in (250,
500, 800 and 1000 mm). Use as many extensions as necessary
between the switchgear and the wall. However, there can be
no corners or turns in the extensions; they must be installed
in a straight line to the exterior of the electric room. Support
the extensions at 47.2 in (1200 mm) intervals using any secure
supporting method.
Verify the correct extensions and other necessary parts to
complete the installation.
Remove the temporary cover from all sections of the
switchgear.
!
WARNING
Temporary Cover
