Protective Grounding For The Rack; Space Requirements For The Rack; Securing The Rack - Extreme Networks Summit X450a-24tDC Hardware Installation Manual

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.
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. The Summit X450-48tDC switch has a grounding
terminal mounted on the back of the switch.
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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For a Summit DC-powered switch, use a minimum 14 AWG stranded copper wire for grounding.
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AC-powered Summit switches do not need separate chassis grounding.
Position the earth ground as close to the equipment rack as possible to maintain the shortest wiring
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distance possible.
Use a ground impedance tester or micro-ohm meter to test the quality of earth ground connection at
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the chassis. This will ensure good grounding between the chassis, rack, and earth ground.
NOTE
Because building codes vary worldwide, Extreme Networks strongly recommends that you consult an electrical
contractor to ensure proper equipment grounding for your specific installation.

Space Requirements for the Rack

Provide enough space in front of and behind the switch so that you can service it easily. Allow a
minimum of 48 inches (122 cm) in front of the rack and 24 inches (61 cm) behind the rack. When using a
relay (two-post) rack, provide a minimum of 24 inches (61 cm) of space behind the mounted equipment.
Extra room on each side is optional.
WARNING!
Extreme Networks switches do not have a switch for turning power to the unit on and off. For systems using an AC
power supply, power to the switch is disconnected by removing the wall plug from the electrical outlet.
For DC-powered Summit switches (X450a-24tDC, X450a-24xDC, and X450a-48tDC) and the EPS-150DC power
supply, turn off power to the chassis off by de-energizing the circuit that feeds the power supply; this is usually
accomplished by turning off a circuit breaker. Disconnecting the DC wiring harness from the DC power source
requires the performance of a qualified, licensed electrician.

Securing the Rack

The rack should be attached to the wiring closet floor with 3/8-inch (9.5 mm) lag screws or equivalent
hardware. The floor under the rack should be level within 3/16-inch (5 mm). Use a floor-leveling
cement compound if necessary or bolt the racks to the floor as shown in
Summit Family Switches Hardware Installation Guide
Meeting Site Requirements
Figure 48.
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