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.
•
The rack should use the universal mounting rail hole pattern that is identified in IEC Standard 297.
•
The rack should have designated earth grounding connections (typically on the base).
•
The rack must meet earthquake safety requirements equal to that of the installed chassis.
•
The mounting holes should be flush with the rails to accommodate the chassis.
•
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 dependant 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 15A breaker per PSU (Summit X450a-48tDC switch), 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
Building and
Electrical Codes
on page 48 and
Cable Routing for PoE Devices
on page 143. Drill and tap
wire terminals to equipment racks.
Site Preparation
BlackDiamond 8800 Hardware Install Guide
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