Chapter 2 Rack Installation Server Precautions Review the electrical and general safety precautions in the appendix, "Standardized Safety Warnings" in this manual. Determine the placement of each component in the rack before you install the rails. Install the heaviest server components at the bottom of the rack first and then work your way up. Use a regulating uninterruptible power supply (UPS) to protect the server from power surges and voltage spikes and to keep your system operating in case of a power failure. Allow any drives and power supply modules to cool before touching them.
When not servicing, always keep the front door of the rack and all covers/panels on the servers closed to maintain proper cooling. Rack Mounting Considerations Ambient Operating Temperature If installed in a closed or multi-unit rack assembly, the ambient operating temperature of the rack environment may be greater than the room's ambient temperature. Therefore, consideration should be given to installing the equipment in an environment compatible with the manufacturer’s maximum rated ambient temperature (Tmra). Airflow Equipment should be mounted into a rack so that the amount of airflow required for safe operation is not compromised.
Mechanical Loading Equipment should be mounted into a rack so that a hazardous condition does not arise due to uneven mechanical loading. Circuit Overloading Consideration should be given to the connection of the equipment to the power supply circuitry and the effect that any possible overloading of circuits might have on overcurrent protection and power supply wiring. Appropriate consideration of equipment nameplate ratings should be used when addressing this concern. 15