They are both right, kind of, in an open area with 3 or more lighting circuits the emergency battery units may be on a dedicated circuit.
Otherwise the EBUs must
be on the lighting circuit feeding the area the EBUs are located in.
Part of 700.12(E) and it's exception.
700.12(E)........The branch circuit feeding the unit equipment shall be the same branch circuit as that serving the normal lighting in the area and connected ahead of any local switches. The branch circuit that feeds unit equipment shall be clearly identified at the distribution panel. Emergency luminaires (illumination fixtures) that obtain power from a unit equipment and are not part of the unit equipment shall be wired to the unit equipment as required by 700.9 and by one of the wiring methods of Chapter 3.
Exception: In a separate and uninterrupted area supplied by a minimum of three normal lighting circuits, a separate branch circuit for unit equipment shall be permitted if it originates from the same panelboard as that of the normal lighting circuits and is provided with a lock-on feature.
[This message has been edited by iwire (edited 02-08-2004).]