Power Requirements; Power Connection Guidelines For Ac-Powered Systems - Cisco Catalyst 9400 Series Hardware Installation Manual

Power Requirements

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 or captive installation screws to properly
• When removing a component, use an available ejector lever or captive installation screws to release the
• 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
• Avoid contact between the printed circuit boards and clothing. The wrist strap only protects components
• Never attempt to remove the printed circuit board from the metal carrier.
Power Requirements
Power supply modules installed on a switch chassis can be all AC input, all DC input, or a mix of both. When
preparing your site for switch installation, adhere to these requirements:
• In systems that are configured with more than one power supply, connect each of the power supplies to
• To prevent loss of input power, ensure that the total maximum load on each source circuit is within the
• In some systems, you may decide to use a UPS to protect against power failures at your site. When

Power Connection Guidelines for AC-Powered Systems

When connecting AC-input power supply modules to the site power source, observe the guidelines described
here.
Warning This unit might have more than one power supply connection. All connections must be removed to de-energize
the unit. Statement 1028
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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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.
bus connectors from the backplane or midplane.
you plan to return the component to the factory, immediately place it in a static-shielding container.
from ESD voltages on the body; ESD voltages on clothing can still cause damage.
a separate input power source. If you fail to do this, your system might be susceptible to total power
failure due to a fault in the external wiring or a tripped circuit breaker.
current ratings of the wiring and breakers.
selecting a UPS, be aware that some models, which use ferroresonant technology, may become unstable
when operating with the switch power supplies that use power factor correction. This may cause the
output voltage waveform to the switch to become distorted, resulting in an undervoltage situation in the
system.
Preparing for Installation