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 identied 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 ush with the rails to accommodate the chassis.
• The rack should support approximately 270 kg (600 lb).
Ground the Rack
The rack must be properly grounded.
Use a rack grounding kit and a ground conductor that is carried back to earth or to
another suitable building ground.
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.
• For a DC-powered switch, use a minimum 14 AWG stranded copper wire for
grounding.
AC-powered switches do not need separate chassis grounding.
• 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 ensure good grounding between the
chassis, rack, and earth ground.
Note
Because building codes vary worldwide, consult an electrical contractor to
ensure proper equipment grounding for your specic installation.
Provide Adequate Space for the Rack
Provide enough space in front of and behind the switch so that you can service it easily.
Mechanical Recommendations for the Rack Site Preparation
32 ExtremeSwitching 5320 Series Hardware Installation Guide
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