SEPSS testing and UPS’s

There is often confusion about whether the EC.02.05.07 EP3 SEPSS testing requirements apply to the ubiquitous hospital UPS’s that are powered by the emergency power “branches” (life safety branch, critical branch, and equipment system.)

The short answer is that a UPS that gets its power from an EPSS (Emergency Power Supply System) is not a SEPSS. Therefore SEPSS testing requirements do not apply to such UPS’s. Be careful though, you still need to maintain and test any of your non-SEPSS UPS’s that are critical for operations during a power failure in accordance with Note 1 of EC.02.05.07, EP3.