Grounding The Cisco Nexus 7009 Chassis; Prerequisites For Grounding The Chassis; Required Tools And Equipment - Cisco Nexus 7000 Series Hardware Installation And Reference Manual

Grounding the Cisco Nexus 7009 Chassis

1 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)
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:

Prerequisites for Grounding the Chassis

Before you can ground the chassis, you must have a connection to the earth ground for the data center building.
If you installed the Cisco Nexus 7009 chassis into a bonded rack (see the rack manufacturer's instructions for
more information) that now has a connection to the data center earth ground, you can ground the chassis by
connecting its grounding ports to the rack. Otherwise, you must connect the chassis grounding ports directly
to the data center ground.

Required Tools and Equipment

To connect the system ground, you need the following tools and materials:
• Grounding lug—A two-holed standard barrel lug that supports up to 6 AWG wire. This lug is supplied
• Grounding screws—Two M4 x 8 mm (metric) pan-head screws. These screws are shipped with the Cisco
• Grounding wire—Not supplied with the Cisco Nexus 7009 system accessory kit. This wire should be
• Number 1 Phillips-head screwdriver with torque capability.
• Crimping tool to crimp the grounding wire to the grounding lug.
• Wire-stripping tool to remove the insulation from the grounding wire.
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
54
with the Cisco Nexus 7009 system accessory kit.
Nexus 7009 accessory kit.
sized to meet local and national installation requirements. Depending on the power supply and system,
a 12 AWG to 6 AWG copper conductor is required for U.S. installations. We recommend that you use
commercially available 6 AWG wire. The length of the grounding wire depends on the proximity of the
switch to proper grounding facilities.
Installing a Cisco Nexus 7009 Chassis