- Electric Source for Safety Services ("ESSS")
An Electric Source for Safety Services (ESSS) in relation to emergency lighting and exit sign systems refers to the dedicated electrical power supply that provides uninterrupted power to essential fire safety systems and equipment during an emergency when normal power is lost such as during a fire or other emergency.
The ESSS ensures that these systems remain operational by providing an alternative power source, such as a battery backup, supercapacitor (EDLC), emergency generator, or other fail-safe power options.