The healthcare industry has transformed itself with technological advancements. Every hospital room is filled with electrical and electronic devices, both small and large, that are used for diagnosis and treatments. Since most of the hospitals contain many rooms, and a lot of them are designed for specific purposes, there is a wide variety of power requirements for each section of the hospital.
The electrical devices and systems chosen for hospitals have to go through various levels of testing to ensure that it doesn't fail. Unlike any other industry, failing electricals for hospitals could result in loss of lives. For the same reasons, many of the hospitals follow a design where there are multiple electrical systems in place to make sure there is the power supply to critical equipment that keeps patients alive. A commonly seen practice is to provide a separate independent power source for such critical equipment and to let the other less critical equipment to run on a different circuit.