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Site Preparation
Rack Specifications and Recommendations
Racks should conform to conventional standards. In the United States, use EIA Standard RS-310C:
Racks, Panels, and Associated Equipment. In countries other than the United States, use IEC Standard
297. In addition, verify that your rack meets the basic mechanical, space, and earthquake requirements
that are described in this section.
Mechanical Recommendations for the Rack
Use equipment racks that meet the following mechanical recommendations:
Use an open style, 19-inch rack to facilitate easy maintenance and to provide proper ventilation.
●
Use a rack made of steel or aluminum.
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The rack should use the universal mounting rail hole pattern that is identified in IEC Standard 297.
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The rack should have designated earth grounding connections (typically on the base).
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The rack must meet earthquake safety requirements equal to that of the installed chassis.
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The mounting holes should be flush with the rails to accommodate the chassis.
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The rack should support approximately 600 pounds (272 kilograms).
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Protective Grounding for the Rack
Use a rack grounding kit and a ground conductor that is carried back to earth or to another suitable
building ground.
BlackDiamond 12800 series switches are designed with mounting ears that provide metal-to-metal
contact for grounding. Extreme Networks switches also have grounding terminals on the back of the
chassis.
If you do not use equipment racks, you can attach wiring terminals directly to the mounting brackets
for appropriate grounding.
At a minimum, follow these guidelines to ground equipment racks to the earth ground:
CAD weld appropriate wire terminals to building I-beams or earth ground rods.
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Use the appropriate chassis grounding wire for your system, which is dependent upon the available
●
input current to the power supply.
For AC systems using a 20A breaker per PSU (SSI AC), the chassis ground can be as small as
■
14 AWG. The power cable ground should be the same size as the primary.
For DC systems using a 40A breaker per PSU (SSI DC), the chassis ground can be as small as 10
■
AWG. The power cable ground should be the same size as the primary.
NOTE
For complete details on power supplies and power supply cords, refer to the following:
Networks Power Supply Units for BlackDiamond Switches,"
Appendix A, "Safety Information."
Position the earth ground as close to the equipment rack as possible to maintain the shortest wiring
●
distance possible.
46
and
Drill and tap wire terminals to equipment racks.
BlackDiamond 12800 Series Switches Hardware Installation Guide
Chapter 4, "Extreme
"Selecting Power Supply Cords" on page 136
in
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