18 MNS-SG Operation and Maintenance | Manual
2.3.
Seismic installation for plenum
When the MNS-SG is arc resistant with plenum and rated for
seismic, the seismic supports (not included by ABB) for the
plenum installation must to be placed after the plenum
extending at least 9 in (225 mm) minimum and maximum 40
in (1000 mm) from the side/back of the switchgear (see
image).
The plenum should be installed by the end user according to
local regulations for a seismic resistance installation.
2.4.
Positioning arc-resistant switchgear
When installing this switchgear, you must provide the
following clearances:
-
The switchgear must be at least three feet from the walls
to either side and behind the switchgear.
-
There must be at least 4.0 in (100 mm) clearance around
the plenum and extensions.
-
The plenum must direct the exhaust outside of the
building.
-
Designate a safe area adjacent to the outlet from the
plenum. This safe area must be 6.0 X 6.0 ft (1.8 X 1.8 m),
clearly marked as a Keep Out or restricted area. Do not
store equipment or materials in this area that could be
damaged by a blast force or heat.
-
Allow at least 15.0 in (400 mm) between nearest objects or
adjacent wall and the end flaps of the plenum.
Safe area-interior
–
front view
Safe area
–
top view
Safe area
–
front view
