Mar 16, 1990 · Publication, by the Underwriters Laboratory, of a safety standard for uninterruptible power supply (UPS) equipment is reported. It is used for evaluating UPS units to determine
Mar 15, 2025 · Businesses investing in Uninterruptible Power Supply (UPS) systems need to understand the standards governing their reliability and market access. Two critical safety
Jun 13, 2014 · This revision of ANSI/UL 1778 dated April 3, 2024 is issued as an editorial update to reflect a title change for a referenced standard in 4.3.8.101.0 and Annex III. As noted in the
Uninterruptible power supplies or UPSs are battery chargers consisting of a combination of convertors, switches and energy storage devices (such as batteries), constituting a power system for maintaining continuity of load power in case of input power failure. 10 CFR 430 Appendix Y 2.27.
It applies to pluggable and to permanently connected UPS, whether consisting of a system of interconnected units or of independent units, subject to installing, operating and maintaining the UPS in the manner prescribed by the manufacturer.
NOTE 2 UPS generally connect to their energy storage device through a DC link. A chemical battery is used throughout the standard as an example of an energy storage device. Alternative devices exist, and as such, where "battery" appears in the text of this document, this is to be understood as "energy storage device".
Subclauses, tables and figures that are additional to those in IEC 62477-1:2012 are, in this document, identified by a suffix in the format of X.10x, for example 4.3.101. Annexes that are additional to those in IEC 62477-1:2012 are, in this document, lettered AA, BB, etc.
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