Emergency Lighting
Most End Users, Battery Suppliers,
Electrical Contractors, and Facilities personnel are unaware of the difference
in operation and legal requirements between Emergency Lighting Equipment and
other types of battery backup systems.
Emergency Lighting systems are Underwriters
Laboratories (UL) listed as Life Safety Equipment and therefore have very
stringent requirements that must be met in their construction and performance.
Equipment that is to be used for emergency lighting must be listed for this
category as determined by the National
Electrical Code (NEC), Article 700 and the National
Fire Protection Association (NFPA) Code #101. These codes dictate the
specifics as to when, where, what, and how Emergency Lighting Equipment shall
be used. They also dictate that all Emergency Lighting Systems must have
periodic maintenance with records kept on file of this maintenance.
Emergency Lighting Equipment listed by
Underwriters Laboratories (under UL Standard #924) must meet performance
testing requirements since it will be relied upon to provide a specified amount
of power for 90 minutes during a power outage. The UL listing report will
indicate which specific batteries the unit is to be provided with and this
information is included with the system in the form of markings. If any other
batteries are placed in one of these systems, it causes the UL listing to be
meaningless. In this case, a Code violation occurs due to these changes.