Cisco Nexus 7004, Руководство по установке и справочное руководство по оборудованию

Страница: 135 / 508

5-13
Cisco Nexus 7000 Series Hardware Installation and Reference Guide
OL-23069-07
Chapter 5 Installing a Cisco Nexus 7018 Chassis
Grounding the Cisco Nexus 7018 Chassis
Grounding the Cisco Nexus 7018 Chassis
The Cisco Nexus 7018 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.
This section includes the following topics:
• Prerequisites for Grounding the Chassis, page 5-13
•
Required Tools and Equipment, page 5-13
• Connecting the System Ground, page 5-14
•
Connecting Your ESD Wrist Strap to the Chassis, page 5-15
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 7018 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 ground 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 with the Cisco Nexus 7018 system accessory kit.
•
Grounding screws—Two M4 x 8 mm (metric) pan-head screws. These screws are shipped with the
Cisco Nexus 7018 system accessory kit.
•
Grounding wire—Not supplied with the Cisco Nexus 7018 system accessory kit. This wire should
be 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.
1
Handles used to adjust the chassis placement
2
Nine 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 18 screws)