(1) In transfer switches

(2) In exit or emergency luminaires supplied from two sources

(3) In a common junction box attached to exit or emergency luminaires supplied from two sources

The wiring of the critical branch shall be permitted to occupy the same raceways, boxes, or cabinets of other circuits that are not part of the life safety branch.
(E) Receptacle Identification. The cover plates for the electrical receptacles or the electrical receptacles them selves supplied from the emergency system shall have a distinctive color or marking so as to be readily identifiable. [99:4.5.2.2.4.2]

517.42 Automatic Connection to Life Safety Branch. The life safety branch shall be installed and connected to the alternate source of power so that all functions specified herein shall be automatically restored to operation within 10 seconds after the

interruption of the normal source. No functions other

(C) Alarm and Alerting Systems. Alarm and alerting systems, including the following:

(1) Fire alarms
FPN: See NFPA 707-2006, Life Safety Code, Sections 9.6 and 18.3.4.
(2) Alarms required for systems used for the piping of nonflammable medical gases
FPN: See NFPA 99-2005, Standard for Health Care Facili- ties, 4.4.2.2.2.2(3).

(D) Communications Systems. Communications systems, where used for issuing instructions during emergency conditions.

(E) Dining and Recreation Areas. Sufficient lighting in dining and recreation areas to provide illumination to exitways.

(F) Generator Set Location. Task illumination and se lected receptacles in the generator set location.

(G) Elevators. Elevator cab lighting, control, communications, and signal systems. [99:4.4.2.2.2.2(6), 4.5.2.2.2(7)]

517.43 Connection to Critical Branch. The critical branch shall be installed and connected to the alternate power source so that the equipment listed in

517.43(A) shall be automatically restored to operation
at appropriate time-lag intervals following the
restoration of the life safety branch to operation. Its
arrangement shall also provide for the additional
connection of equipment listed in 517.43(B) by either
delayed automatic or manual operation.
[99:4.5.2.2.3.1]

Exception: For essential electrical systems under 150 kVA, deletion of the time-lag intervals feature for delayed automatic connection to the equipment system shall be permitted.

(A) Delayed Automatic Connection. The following equipment shall be permitted to be connected to the critical branch and shall be arranged for delayed automatic connection to the alternate power source:

(1) Patient care areas — task illumination and selected receptacles in the following:
a. Medication preparation areas b. Pharmacy dispensing areas
c. Nurses' stations (unless adequately lighted by corri
dor luminaires)

(2) Sump pumps and other equipment required to operate for the safety of major apparatus and associated control systems and alarms

(3) Smoke control and stair pressurization systems

(4) Kitchen hood supply and/or exhaust systems, if required to operate during a fire in or under the hood

(5) Supply, return, and exhaust ventilating systems for airborne infectious isolation rooms [99:4.5.2.2.3.3(1) through (5)]

(B) Delayed Automatic or Manual Connection. The following equipment shall be permitted to be connected to the critical branch and shall be arranged for either delayed automatic or manual connection to the alternate power source:

(1) Heating equipment to provide heating for patient rooms.

Exception: Heating of general patient