Buying a UPS system for a critical application power installation is just one step in protecting your investment. In accordance with the IEEE recommended design / installation practices, all installations that have electronic charging equipment of any type must have service entrances equipped with effective protection against lightning. the form of the SPD (protection device against overvoltage) category C listed, as specified, in IEEE C62.41a ?. The purpose of protection against overvoltage at the service entrance is to protect the installation from the adverse effects of transient overvoltages that originate outside of the installation (lightning / switching? n).
In addition, lightning and other phenomena that produce transient current and voltage are harmful to most UPS equipment and to the electronic load equipment they serve. For example, the transient can reach the critical load through an unwanted activation of an unprotected static bypass derivation path around a UPS. Therefore, it is recommended that both the UPS input circuit and the associated UPS bypass circuits (including the manual maintenance bypass circuit) are equipped with an effective SPD category B , as specified in IEEE Std C62.41.
GE supports the IEEE recommended practices. In addition, we recognize that several UPS products are offered with internal SPD. However, these SPDs typically come in the form of a secondary surge suppressor instead of a transient surge suppressor (TVSS). While the IEEE, UL, and NEC standards define secondary suppressors and TVSS as SPD, secondary surge suppressors do not have proven repetitive surge current currents, or voltage setting performance. more adjusted from a TVSS. In addition, TVSS products generally have improved diagnostic features, such as audible alarms, indicator lights, and dry contacts for monitoring and remote fault signaling.