Uninterruptible Power Supplies Specification Version 2
These clarifications have been carried over from a Version 1.0 guidance document and cover issues such as UPSs that operate with both 3-phase and single-phase power, UPSs
Specific requirements for power supplies and UPS systems in critical infrastructures concern reliability, robustness, and security: UPS systems ensure an uninterrupted power supply during power outages and enable an orderly shutdown of systems during prolonged outages.
2.28. Uninterruptible power supply or UPS means a battery charger 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 AC input power failure. 2.28.1.
Currently, PULS offers two options for an uninterruptible power supply to the load in an emergency: both double-layer capacitors and lead-acid batteries can serve as energy storage in DC-UPS systems for industrial applications.
DOE noted that manufacturers would not be required to certify no-load power consumption to DOE as a result of this amendment because the energy conservation standards for UPSs do not have a no-load requirement at this time. Id.
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