|Electrical Systems - Essential Electric System Categories|
*Critical care rooms (Category 1) in which electrical system failure is likely to cause major injury or death of patients, including all rooms where electric life support equipment is required, are served by a Type 1 EES.
*General care rooms (Category 2) in which electrical system failure is likely to cause minor injury to patients (Category 2) are served by a Type 1 or Type 2 EES.
*Basic care rooms (Category 3) in which electrical system failure is not likely to cause injury to patients and rooms other than patient care rooms are not required to be served by an EES. Type 3 EES life safety branch has an alternate source of power that will be effective for 1-1/2 hours.
3.3.138, 188.8.131.52.10, 184.108.40.206.2, 220.127.116.11.1 (NFPA 99), TIA 12-3