Mechanical Recommendations For The Rack; Protective Grounding For The Rack - Extreme Networks BlackDiamond 8800 Series Hardware Installation Manual

Site Preparation

Mechanical Recommendations for the Rack

Use distribution 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.
●
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 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.
This recommendation does not apply to the Summit family of switches, other than the Summit
X450a-48tDC switch. Other Summit switches do not need separate chassis grounding for AC or DC
systems.
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.
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.
28
and
Drill and tap wire terminals to equipment racks.
Extreme Networks Consolidated ExtremeXOS Hardware Installation Guide
Chapter 6, "Extreme
"Power Supply Cords Selection" on page 375 in