(a) Where a total of more than four exit and/or directional signs is required, the signs shall be connected to an emergency power source or to storage battery equipment meeting the requirements of the commissioner, provided, however, that in existing buildings, the signs may be on circuits that are separate from the general lighting and power circuits, taken off ahead of the main switch.
(b) Existing high rise buildings classified in occupancy group C, D or H and existing buildings classified in occupancy group E, G or J-1 (except for "residential hotels," as such term is defined by the commissioner pursuant to rules and regulations) shall comply with the requirements of this section on or before April first, nineteen hundred eighty-seven.
(c) Notwithstanding the foregoing, in the existing buildings required to comply with subdivision (b) of this section, all such existing exit and/or directional signs on circuits taken off ahead of the main switch shall be connected to an emergency power source or to storage battery equipment meeting the requirements of the commissioner on or before July 1, 2007.
Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 1996/059.