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MX28B-1200 PRODUCT MANUAL Revision B
14 MX28B-1200/2400
5.1.5 Room/Locations
NOTE: The APC Model MX28B dc power plant is to be installed in a room, vault, or
similar enclosure that is accessible only to qualified persons in accordance with
the NEC or the authority having jurisdiction.
Prior to installation, drawings, floor loading requirements, external alarm points, ac service
entrance, and grounding schemes should all be checked and confirmed. If batteries are to be
mounted in a room separate from the power plant, careful attention should be paid to battery
cable voltage drop effects. Environmental operating temperatures and ventilation/cooling
considerations should also be noted, not just for the power system but for all other equipment
that may reside in the power room area.
5.1.6 Mounting
The box frame housing the MX28B components is self-supporting, but designed to be bolted to
the floor of the housing structure. Figure 5-1 shows the footprint of the box frame and the
mounting points with dimensions (shown in inches). Consult the system design specifications to
see if it is necessary to electrically isolate the frame from the floor structure. This is required in
many installations.
Systems with multiple box frames are mounted with each frame touching, side by side. The side
cover panels where two frames touch are removed so that bus work and control cables can pass
between the frames. Three holes are provided in center vertical rail of each side to allow the
frames to be mechanically secured to each other if desired.
11.50
23.00
11.50
1.50
FRONT
Figure 5-1 Floor Mounting Dimensions