Grounding The Cisco Nexus 7004 Chassis - Cisco Nexus 7004 Installation Manual

Grounding the Cisco Nexus 7004 Chassis

Step 4
If you removed any power supplies, replace them as explained in one of the following sections:
• To install an AC power supply unit, see the "Installing a 3-kW AC Power Supply Unit During Operations" section.
• To install a DC power supply unit, see the "Installing a 3-kW DC Power Supply Unit During Operations" section.
• To install a HVAC/HVDC power supply unit, see the "Installing a 3.5-kW HVAC/HVDC Power Supply Unit During
Operations" section.
Grounding the Cisco Nexus 7004 Chassis
The Cisco Nexus 7004 switch is fully grounded as soon as you connect the chassis and the power supplies to
the earth ground in the following ways:
• You connect the chassis to either a grounded and fully bonded rack or to the data center ground. This
Note
• You connect the AC power supplies to the earth ground automatically when you connect an AC power
• You connect the DC power supplies to the earth ground before connecting the power supplies to the DC
• You automatically ground an HVAC/HVDC power supply when you connect the HVAC/HVDC power
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 7004 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 port to the rack. Otherwise, you must connect the chassis grounding port directly to
the data center ground.
Installing a Cisco Nexus 7004 Chassis
8
ground connection is active even when the power supplies are not installed.
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.
supply to an AC power source.
power source (see the "Connecting a DC Power Supply Directly to DC Power Sources" section on page
6-11 ).
supply to a power source.
Installing a Cisco Nexus 7004 Chassis