The Computer System Type column lists three general categories that computer systems fall into. Nearly all systems can be described by one of these categories. Necessary Runtime , listed in column three, is the time that the system must remain operational in the event of a power failure. Many system, such as PC s and some servers, can be safely shut down in a short period of time. However, larger systems, which are central to more important operations, may take several hours to shut down, or they may never be able to be shut down.
Large systems are the types that require maximum protection.
In column four is Required Availability , which is merely a qualitative description of how often the system needs to operate. It is directly related to the runtime column. The table can be used to determine what UPS type is required, and whether or not a generator is required, for a particular system. Once the appropriate size and type of power protection system has been determined, a power protection manufacturer should be contacted to discuss the exact requirements and installation details. Manufacturers will be able to provide extensive information about their products as well a support and technical assistance once the system is running.