I designed control panel modifications and programmed an upgrade to a hospital diesel generation system so they could transfer from diesel back to utility without an outage, and have planned transfer of load to diesel without turning the lights out.

We had three windows at 1 am where any new critical patients would be diverted to a different hospital. The first we used for major maintenance to the breakers in the switchgear, the second we used for modifications to the bus work, and the last outage was to test the operation of the new control system.

They do a transfer to diesel every month and the whole hospital is aware of it in case it results in a blackout.

So, the ER just shuts down for that hour?

Doesn’t epic cover everything from patient admission to medical imaging?

Hospitals expect to be able to run off paper for hours.

If anything, the hospitals are much more reasonable in terms of expectations of uptime than people's expectations of cat video avaliability.

We used to get 4 hour downtime windows to completely redo switch stacks for every switch closet in a location over a single week for example.

Fine as long as there is a workaround or the impact has been assessed.