• Reverse air flow — To ensure cool air intake and to avoid hot air blow out from the I/O panel, ensureyou have the necessary clearance.• Reliable earthing — Maintain reliable earthing of rack-mounted equipment. Pay particular attention tothe supply connections other than the direct connections to the branch circuit; for example, the useof the power strips.• Do not mount the equipment with the Utility panel facing in the downward position.NOTE: These instructions are a condensed reference. Read the safety instructions in your Safety,Environmental, and Regulatory information booklet before you begin.NOTE: The illustrations in this document are not intended to represent a specific switch.Install the Dell ReadyRails SystemDell Networking provides the ReadyRails rack mounting system so you can easily configure a rack toinstall the S4820T switch.You can install the ReadyRails system using the 1U tool-less method or one of three possible 1U tooledmethods (two-post flush mount, two-post center mount, or four-post threaded).Refer to the appropriate instructions for the mounting configuration you’re using:Installing ReadyRails — Tool-less MethodInstalling ReadyRails — Two-Post Flush-Mount ConfigurationInstalling ReadyRails — Two-Post Center-Mount ConfigurationInstalling ReadyRails — Four-Post Threaded ConfigurationInstall the Hardware 19