• Use the correct external power source. Operate the product only from the type of power source indicated
on the electrical ratings label. If you are not sure of the type of power source required, consult a local
electrician.
• To help prevent electrical shock, plug all the power cables into properly grounded electrical outlets.
These power cables are equipped with three-prong plugs to ensure proper grounding. Do not use adapter
plugs or remove the grounding prong from a power cable.
• Observe power strip ratings. Make sure that the total current rating of all products that are plugged into
the power strip does not exceed 80 percent of the power strip rating.
• Do not modify power cables or plugs yourself. Consult with a licensed electrician or your power company
for site modifications. Always follow your local and national wiring codes.
Preventing ESD Damage
ESD damage might occur when modules or other FRUs are improperly handled, resulting in intermittent or
complete failure of the modules or FRUs. Modules consist of printed circuit boards that are fixed in metal
carriers. EMI shielding and connectors are integral components of a carrier. Although the metal carrier helps
to protect the board from ESD, always use an ESD-grounding strap when handling modules. To prevent ESD
damage, follow these guidelines:
• Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.
• Connect the equipment end of the strap to an unfinished chassis surface.
• When installing a component, use an available ejector lever to properly seat the bus connectors in the
backplane or midplane. These devices prevent accidental removal, provide proper grounding for the
system, and help to ensure that bus connectors are properly seated.
• When removing a component, use an available ejector lever to release the bus connectors from the
backplane or midplane.
• Handle carriers by available handles or edges only; avoid touching the printed circuit boards or connectors.
• Place a removed component board-side-up on an antistatic surface or in a static-shielding container. If
you plan to return the component to the factory, immediately place it in a static-shielding container.
• Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components
from ESD voltages on the body; ESD voltages on clothing can still cause damage.
• Never attempt to remove the printed circuit board from the metal carrier.
Cisco Catalyst 9300 Series Switches Hardware Installation Guide
43
Preparing for Installation
Preventing ESD Damage
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