Extreme Networks Summit X150 Series Hardware Installation Manual page 157

Allow a minimum of 48 inches (122 cm) in front of the rack and 30 inches (76 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.
The DC-powered Summit switches include the X450a-24tDC, X450a-24xDC, X450a-48tDC
switches, and the Summit X460, X480, and X650 series switches with installed DC power
supplies. For these switches and the EPS-150DC power supply, turn off power to the chassis
by de-energizing the circuit that feeds the power supply. This is usually accomplished by
turning off a circuit breaker. Disconnecting the DC power cable from the DC power source
must be done by 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.
Figure 142: Properly Secured Rack
Brace open equipment racks if the channel thickness is less than 1/4 inch (6.4 mm).
Summit Family Hardware Installation Guide
Site Preparation
157