• The most critical factor for power systems used by information-processing equipment is that the power infrastructure be properly installed and correctly grounded. In case of power outage, an Uninterruptible Power Supplies (UPS) is a backup power source for major computer systems. Grounding ensures that the returning flow of current is properly discharged to the ground. Another important aspect of power management is the need to be able to stop power immediately. A server room should equipped with an emergency power shutoff, which is usually a large red button, prominently placed to facilitate access, with an accident-proof cover to prevent unintentional use.