Rack specifications and recommendations, Mechanical recommendations for the rack, Protective grounding for the rack – Extreme Networks BlackDiamond 12804 User Manual
Page 46
Site Preparation
BlackDiamond 12800 Series Switches Hardware Installation Guide
46
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.
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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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Install equipment into the lower half of the rack first to avoid making the rack top-heavy.
●
The rack should support approximately 600 pounds (272 kilograms).
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.
All Extreme Networks switches are designed with mounting brackets that provide solid metal-to-metal
connection to the rack. If you do not use equipment racks, you can attach wiring terminals directly to
the mounting brackets for appropriate grounding. Extreme Networks switches have grounding
terminals that are mounted on the back of the chassis.
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.
●
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,”
and
“Selecting Power Supply Cords” on page 136
Appendix A, “Safety Information.”
Drill and tap wire terminals to equipment racks.
●
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.