11
Instruction Booklet IB01900001E
Effective August 2017
Instructions for Magnum DS Metal-Enclosed
Low-Voltage ARC Resistant Switchgear Assemblies
EATON www.eaton.com
Figure 10. Hardware Connection Plenum Sections.
3.6 Arc Plenum & Exhaust Duct (Optional)
The arc plenum and exhaust duct can be included with the Arc
Resistant assembly as an added degree of protection to prevent
inhalation of the harmful gasses associated with electrical arcs.
During an arcing event, the high temperatures generated are suf-
ficient enough to vaporize all materials in the vicinity of the arc. This
includes copper, steel, plastic and coating materials used on all com-
ponents. By utilizing an arc plenum and exhaust duct system, these
harmful gasses can be channeled from the room in which the gear is
installed and into a different location away from personnel.
3.6.1 Arc Plenum
The arc plenum will arrive separately from the switchgear, but
assembled in the same shipping section widths as the switchgear
assembly. Each plenum section will require mounting on top of the
switchgear assembly after the switchgear sections are connected
and in permanent position. To mount the plenum, place it on top of
the gear such that the shorter vertical side faces the front of the
switchgear. Holes for mounting the plenum will be available on the
top of the switchgear assembly. Three mounting holes are located
in the front of each vertical section, and five are located to the rear.
Install the bolt / lock washer / flat washer combination provided in
the front of the plenum as shown in Figure 9. Use the thread cutting
screws provided (without washers) to mount the rear of the plenum.
To connect plenum sections use the hardware combination shown in
Figure 10 to fill EACH mounting hole.
3.6.2 Exhaust Duct
Exhaust ducts permit harmful gasses to be channeled from the
room in which the gear is installed into a different location away
from personnel. Ducts can be a variety of lengths and connected to
the plenum from either side or from the rear.
3.6.2.1 Side Exit Exhaust Duct
After mounting the plenum, the exhaust duct can be installed. To
attach the exhaust duct to the plenum, follow the hardware con-
nection type shown in Figure 11 to mount three sides of the duct
mounting brackets to the plenum. For the lower flange, utilize the
included self drilling screw to connect the lower side of the plenum
to the switchgear structure.
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