System Grounding - Cisco Catalyst 9500 Series Hardware Installation Manual

System Grounding

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
Warning
Caution
The following table lists some general grounding practice guidelines.
Cisco Catalyst 9500X Series Switches Hardware Installation Guide
22
When installing or replacing the unit, the ground connection must always be made first and disconnected
last. Statement 1046
Installations that rely solely on system grounding that uses only an AC third-prong ground run a
substantially greater risk of equipment problems and data corruption than those installations that use
both the AC third-prong ground and a properly installed system ground.
Preparing for Installation