Grounding The Cisco Nexus 7009 Chassis - Cisco Nexus 7000 Series Hardware Installation And Reference Manual

Chapter 2 Installing a Cisco Nexus 7009 Chassis
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m
Use a Phillips screwdriver to screw in seven to eight M6 x 19-mm or 12-24 x 3/4-inch screws in each of
Step 6
the two chassis vertical mounting brackets (use a total of 12 to 14 screws for each of two mounting
brackets) as shown in
Figure 2-10
1

Grounding the Cisco Nexus 7009 Chassis

If you are using AC power supply units, the Cisco Nexus 7009 system is grounded through the AC power
supply cables and one of two grounding connections on the chassis. The AC power supply cables provide
a connection to an earth ground whenever you connect the AC power to the system. The system ground,
also referred to as the network equipment building system (NEBS) ground, provides additional
grounding for EMI shielding requirements and for the low-voltage supplies (DC-DC converters) on the
modules. This grounding system is active even when the AC power cables are not connected to the
system. You establish this ground by connecting one of the two grounding pads on the chassis to the rack
(if it is connected to an earth ground) or directly to the earth ground for the data center building.
If you are using DC power supply units, you must connect each DC power supply unit to the earth ground
before connecting the DC power source to the DC power supply units. You also connect the chassis to
the NEBS ground for EMI shielding requirements and for the low-voltage supplies on the modules.
This section includes the following topics:
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OL-23069-06
Figure 2-10.
Attaching the Center Mounted Cisco Nexus 7009 Chassis to the Rack
Seven to eight M6 x 19 mm or 10-24 x 3/4 in.
Phillips screws used to attach each side
bracket to a front mounting rail (use a total of
eight screws)
Prerequisites for Grounding the Chassis, page 2-20
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
Grounding the Cisco Nexus 7009 Chassis
2-19