Ha! Sometimes. Old hospitals. Life safety circuits such as exit devices, fire alarm control panels, BAS systems, partially powered security systems, nurse call control panels. Never know 100% what’s been put on what circuit/panel during countless renovations since the ‘50s. These things are a.... “life saver” (sorry couldn’t help it...). Real “life support” (not life safety) medical equipment typically has an included battery backup/UPS that will maintain life support for minutes or hours depending on the equipment and age. I would have had to rethink using these if they were discontinuing with cause. In all honestly, 75% of the time it’s powering some doctors fridge or a computer/printer/copier that just “can’t” go down... I will say it has prevented abandoning several outages due to someone’s “unacceptable unforeseen outage” and has saved its own cost several times over in temporary power provisions.