To predict and prevent strong EMI, you might need to consult experts in radio frequency interference
(RFI).
Note
The wiring is unlikely to emit radio interference if you use twisted-pair cable with a good distribution of
grounding conductors. If you exceed the recommended distances, use a high-quality twisted-pair cable with
one ground conductor for each data signal when applicable.
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 caused by
lightning or other high-energy phenomena can easily couple enough energy into unshielded conductors
to destroy electronic switches. You might want to consult experts in electrical surge suppression and
shielding if you had similar problems in the past.
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 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 (we recommend 6-AWG wire for U.S.
installations) connected to the chassis with a grounding lug (provided in the switch accessory kit) and to the
facility ground.
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.
Note
Planning for Power Requirements
The switch includes two power supplies (1-to-1 redundancy with current sharing) in one of the following
combinations:
•
Two 350-W AC power supplies
Cisco Nexus 9348GC-FXP NX-OS Mode Hardware Installation Guide
11
Preparing the Site
Shock and Vibration Requirements
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