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(A) General
Emergency illumination shall include means of egress lighting, illuminated exit signs, and all other luminaires specified as necessary to provide required illumination.
(B) System Reliability
Emergency lighting systems shall be designed and installed so that the failure of any illumination source cannot leave in total darkness any space that requires emergency illumination. Control devices in the emergency lighting system shall be listed for use in emergency systems. Listed unit equipment in accordance with 700.12(I) shall be considered as meeting the provisions of this section.
Informational Note: 700.23 through 700.26 provide requirements for applications of emergency system control devices.
(C) Discharge Lighting
Where high-intensity discharge lighting such as high- and low-pressure sodium, mercury vapor, and metal halide is used as the sole source of normal illumination, the emergency lighting system shall be required to operate until normal illumination has been restored.
(D) Disconnecting Means
Where an emergency system is installed, emergency illumination shall be provided in the area of the disconnecting means required by 225.31 and 230.70, as applicable, where the disconnecting means are installed indoors.
Exception: Alternative means that ensure that the emergency lighting illumination level is maintained shall be permitted.

Related Code Sections

700.16 Special Conditions, Emergency Illumination
Emergency illumination shall include means of egress lighting, illuminated exit signs, and all other luminaires specified as necessary to provide ...
700.16 Special Conditions, Emergency Illumination
Emergency illumination shall include means of egress lighting, illuminated exit signs, and all other luminaires specified as necessary to provide ...
1008.3 Means of Egress, Emergency Power for Illumination
means of egress, an emergency electrical system shall automatically illuminate all of the following areas: Aisles. Corridors. Exit access stairways ...
1008.3 Means of Egress, Emergency Power for Illumination
exits or access to exits, an emergency electrical system shall automatically illuminate all of the following areas: Aisles. Corridors. Exit access ...