Item Description Item Description
3 Thin washer 9 Lower plastic isolator bushing
(used only on DC powered
systems)
4 Top plastic isolator bushing AC Typical leveling foot installation
for an AC-powered rack
5 Thick washer DC Typical leveling foot installation
for an DC-powered rack
6 Spacer
6. Position the two mounting plates in the approximate mounting location under the rack.
7. Create a rack-mounting bolt assembly by adding the following items, in the order listed, to each rack-
mounting bolt.
a. Thin washer
b. Top plastic isolator bushing
c. Thick flat washer
d. Spacer
Note: Ensure that the bottom isolators are in place so that the mounting plate and the rack-mounting
bolts are properly aligned.
8. Insert a rack-mounting bolt assembly through each of the leveling feet.
9. Reposition the rack-mounting plates under the four rack-mounting bolts so that the mounting bolts
are centered directly over the threaded bolt holes.
10. Turn the rack-mounting bolts four complete turns into the mounting plate's threaded bolt holes.
11. Mark the raised-floor panel around the edges of the front and rear rack-mounting plates.
12. Mark the plate bolt-down holes that are accessible through the opening in the rear of the rack.
13. Remove the rack-mounting bolt assemblies.
14. Remove the rack-mounting plates from the marked locations.
15. If you are installing an AC-powered rack, remove the bottom isolator bushing from each of the
leveling feet.
16. Loosen each of the locking screws on the casters.
17. Move the rack so that it is clear of both areas that were marked on the floor for the rack-mounting
plate locations.
18. Reposition the mounting plates within the marked areas.
19. Mark the raised-floor panel at the center of each hole in the rack-mounting plates (including the
threaded holes).
20. Remove the two rack-mounting plates from the marked locations on the raised floor panel.
21. At the marked location of the threaded rack-mounting bolt holes, drill four clearance holes into and
through the raised floor. This allows the rack-mounting bolts enough room to protrude past the
thickness of the rack-mounting plates.
Note: You must use a minimum of two anchor bolts for each rack-mounting plate to securely attach
the rack-mounting plate through the raised-floor panel to the concrete floor. Because some of the
holes in each rack-mounting plate might align with concrete reinforcement rods embedded in the
concrete, some of the rack-mounting plate holes might not be usable.
Note: The quantity, location, size, or type of concrete anchors and hardware to install the rack-
mounting plate must be determined by the Professional Engineer or the mechanical contractor
performing the rack-mounting plate installation.
Racks and rack features
17
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