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
devices. If you have had problems of this sort in the past, you may want to consult experts in electrical surge
suppression and shielding.
Shock and Vibration
The switch has been shock- and vibration-tested for operating ranges, handling, and earthquake standards to
NEBS (Zone 4 per GR-63-Core). These tests have been conducted in earthquake environment and criteria,
office vibration and criteria, transportation vibration and criteria, and packaged equipment shock.
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage,
undervoltage, and transients (or spikes) can erase data from memory or even cause components to fail. To
protect against these types of problems, power cables should always be properly grounded. Also, place the
system on a dedicated power circuit (rather than sharing a circuit with other heavy electrical equipment). In
general, do not allow the system to share a circuit with any of the following:
• Copy machines
• Air conditioners
• Vacuum cleaners
• Space heaters
• Power tools
• Teletype machines
• Laser printers
• Facsimile machines
• Any other motorized equipment
Besides these appliances, the greatest threats to a system's power supply are surges or blackouts that are caused
by electrical storms. Whenever possible, turn off the system and peripherals, if any, and unplug them from
their power sources during thunderstorms. If a blackout occurs—even a temporary one—while the system is
turned on, turn off the system immediately and disconnect it from the electrical outlet. Leaving the system on
may cause problems when the power is restored; all other appliances left on in the area may create large
voltage spikes that may damage the system.
System Grounding
You must install a system ground as part of the chassis installation process. Chassis installations that rely only
on the AC third-prong ground are insufficient to adequately ground the systems.
Proper grounding practices ensure that the buildings and the installed equipment within them have
low-impedance connections and low-voltage differentials between chassis. When you install a system ground,
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
31
Preparing for Installation
Shock and Vibration
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