Attaching the rack to a concrete floor

If you plan to install the front or back ac electrical outlets in the rack, the rack must be bolted to the floor. This section describes how to perform this task for a concrete floor.

1. Put the rack in its predetermined location, and tighten the locking screws on the casters.
2. If they are installed, remove the top, left, and right trim panels. The trim panels are held in place with spring clips. See the following illustration.
   

   1	Rack chassis	4	Right-side trim panel
   2	Top trim panel	5	Spring clip
   3	Left-side trim panel

   Figure 1. Removing the trim panels
3. If they are installed, remove the front and back doors. After the rack doors have been removed, go to the next substep. To remove a rack door:
   1. Unlock and open the door.
   2. Grasp the door firmly with both hands and pull it away from the hinges.
4. Locate the hardware mounting kit and the two mounting plates. Refer to the following illustration when reviewing the contents of the hardware mounting kit. The hardware mounting kit contains the following:
   • 4 Rack-mounting bolts
   • 4 Thin washers
   • 8 Plastic isolator bushings
   • 4 Thick washers
   • 4 Spacers
5. If you are installing an ac-powered rack, temporarily install the lower plastic isolator bushings to help you locate the mounting locations for the stabilizer bracket. After the stabilizer bracket has been correctly located, remove the lower plastic isolator bushings.
   
   Figure 2. Installing ac-power mounting plates

   

   1	Rack chassis	7	Jam nut
   2	Rack-mounting bolt	8	Leveling foot
   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.
   1. Thin washer
   2. Top plastic isolator bushing
   3. Thick flat washer
   4. Spacer
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.
    

    1	Rack-mounting bolt	7	Leveling foot
    2	Thin washer	8	Lower plastic isolator bushing (Used only on dc powered systems)
    3	Top plastic isolator bushing	9	Mounting plate
    4	Thick washer	10	Threaded hole (Used to secure the rack to stabilizer bracket.)
    5	Spacer	11	Anchor bolt hole
    6	Jam nut	12	Traced pattern (Pattern to be traced onto the floor using the stabilizer bracket as a template)

    Figure 3. Securing the rack to the floor
11. Mark the floor around the edges of both stabilizer brackets.
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. If you are installing an ac-powered rack, remove the bottom isolator bushing from each of the leveling feet.
15. Remove the stabilizer brackets from the marked locations.
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 stabilizer bracket locations.
18. Reposition the stabilizer brackets within the marked areas.
19. Mark the floor at the center of all holes in both stabilizer brackets.
20. Remove the two rack-mounting plates from the marked areas.
21. At the marked location of the threaded rack-mounting bolt holes, drill four clearance holes into the concrete floor. Each clearance hole should be approximately 1-inch deep. This depth allows the rack-mounting bolts enough room to protrude past the thickness of the stabilizer brackets.
    Note: You must use a minimum of two anchor bolts for each rack-mounting plate to securely attach the plate 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.
22. Select at least two suitable hole locations for each stabilizer bracket bolt. The selected locations should be as close to the threaded bolt holes as possible. Be sure that the holes selected at the back of the rack are accessible. Drill holes at the selected locations into the concrete floor.
23. Position the stabilizer brackets over the concrete anchors.
24. Securely bolt the front stabilizer bracket to the concrete floor.
25. Position the stabilizer bracket over the concrete anchors.
26. Securely bolt the back stabilizer bracket to the concrete floor.
    Note: The size of the anchor bolts and concrete anchors must be determined by the mechanical contractor who will be installing the rack-mounting plate.
27. Position the rack over the stabilizer bracket.
28. Insert each of the stabilizer bracket bolts through a flat washer, a plastic isolator bushing and a thick washer, and through a leveling foot.
29. Align the four stabilizer brackets bolts with the four tapped holes in the two mounting plates and turn three to four rotations.
30. Tighten the locking screw on each caster.
31. Adjust the leveling feet downward as needed until the rack is level. When the rack is level, tighten the jam nuts against the base of the rack.
    

    1	Rack front (base)
    2	Leveling foot (quantity 4)
    3	Jam nut (quantity 4)

    Figure 4. Adjusting the leveling feet
32. If you have multiple racks that are connected in a suite (bolted to each other), go to Connecting multiple racks with rack-to-rack attachment kit. Otherwise, torque the four bolts to 40-50 ft-lbs (54-67 nm).
33. If you are not installing doors on your rack, install the top, left, and right trim panel.
34. Connect the power distribution system as described in Connecting the power distribution system.
35. After all racks are bolted down, go to Attaching the front or back ac electrical outlet.
36. If you are not going to attach a front electrical outlet and you are installing rack doors, go to Attaching the rack doors