•
Position the earth ground as close to the equipment rack as possible to maintain the shortest wiring
distance possible.
•
Use a ground impedance tester or micro-ohm meter to test the quality of earth ground connection
at the chassis. This will insure good grounding between the chassis, rack, and earth ground.
Note
Because building codes vary worldwide, We strongly recommend that you consult an
electrical contractor to ensure proper equipment grounding for your specific installation.
Space Requirements for the Rack
Provide enough space in front of and behind the switch so that you can service it easily. Allow a
minimum of 48 inches (122 cm) in front of the rack and 24 inches (61 cm) behind the rack. When using a
relay (two-post) rack, provide a minimum of 24 inches (61 cm) of space behind the mounted
equipment. Extra room on each side is optional.
Securing the Rack
The rack should be attached to the wiring closet floor with 3/8-inch (9.5 mm) lag screws or equivalent
hardware. The floor under the rack should be level within 3/16-inch (5 mm). Use a floor-leveling cement
compound if necessary or bolt the racks to the floor as shown in
the following figure
.
Figure 32: Properly Secured Rack
Brace open equipment racks if the channel thickness is less than 1/4 inch (6.4 mm).
Site Preparation
BlackDiamond 8800 Hardware Install Guide
53
