Shock And Vibration Requirements; Grounding Requirements; Planning For Power Requirements - Cisco Nexus 9508 Hardware Installation Manual

Preparing the Site
Caution

Shock and Vibration Requirements

The switch has been shock- and vibration-tested for operating ranges, handling, and earthquake standards.

Grounding Requirements

The switch is sensitive to variations in voltage that is supplied by the power sources. Overvoltage, undervoltage,
and transients (or spikes) can erase data from memory or cause components to fail. To protect against these
types of problems, ensure that there is an earth-ground connection for the switch. You can connect the grounding
pad on the switch either directly to the earth-ground connection or to a fully bonded and grounded rack.
When you properly install the chassis in a grounded rack, the switch is grounded because it has a metal-to-metal
connection to the rack. Alternatively, you can ground the chassis by using a customer-supplied grounding
cable that meets your local and national installation requirements. For U.S. installations, we recommend
6-AWG wire. Connect your grounding cable to the chassis with a grounding lug (provided in the switch
accessory kit) and to the facility ground.
Note
Note

Planning for Power Requirements

To plan for the power requirements of a switch, you must determine each of the following:
• Power requirements for all the switch components
• Minimum number of power supplies required to power the components that are installed in the switch.
If the wires exceed the recommended distances, or if wires pass between buildings, give special
consideration to the effect of a lightning strike in your vicinity. The electromagnetic pulse that is caused
by lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors
to destroy electronic switches. You will want to consult experts in electrical surge suppression and
shielding if you had similar problems in the past.
You automatically ground AC power supplies when you connect them to AC power sources. For DC
power supplies, you must connect a grounding wire when wiring the power supply to the DC power
source.
An electrical conducting path shall exist between the product chassis and the metal surface of the
enclosure or rack in which it is mounted or to a grounding conductor. Electrical continuity shall be
provided by using thread-forming type mounting screws that remove any paint or non-conductive
coatings and establish a metal-to-metal contact. Any paint or other non-conductive coatings shall be
removed on the surfaces between the mounting hardware and the enclosure or rack. The surfaces shall
be cleaned and an antioxidant applied before installation.
Cisco Nexus 9508 ACI-Mode Switch Hardware Installation Guide
Shock and Vibration Requirements
9