(B) Delayed Automatic or Manual Connection to the Equipment Branch
- Heating Equipment to Provide. Heating for General Patient Rooms. Heating of general patient rooms during disruption of the normal source shall not be required under any of the following conditions:
(a) The outside design temperature is higher than —6.7°C (20°F).
(b) The outside design temperature is lower than —6.7°C (20°F) and where a selected room(s) is provided for the needs of all confined patients, only such room(s) need be heated.
(c) The facility is served by a dual source of normal power as described in 517.30(C), Informational Note.
Informational Note: The outside design temperature is based on the 97.5 percent design values, as shown in Chapter 24 of the ASHRAE Handbook of Fundamentals (2013).
- Elevator Service. In instances where disruption of power would result in elevators stopping between floors, throw-over facilities shall be provided to allow the temporary operation of any elevator for the release of passengers.
- Optional Connections to the Equipment Branch. Additional illumination, receptacles, and equipment shall be permitted to be connected only to the critical branch.
- Multiple Systems. Where one switch serves multiple systems as permitted in 517.43, transfer for all loads shall be nondelayed automatic. [99:18.104.22.168.1.6(E)]