Emergency lighting is often referred to as exit lighting. Emergency lights are used in commercial buildings to prevent blackouts and enable people to find their way out. Export signs are often used with emergency lighting equipment.
Due to the strict requirement to provide an average of one foot of
candlelight along the exit path, emergency lighting should be carefully selected
to ensure compliance.
In recent years, emergency lighting has seldom used traditional two-head units - manufacturers have expanded the concept of emergency lighting to accommodate and integrate emergency lighting into buildings.
The emergency lighting device can be a central backup power source, such as a stack of lead-acid batteries and controls/chargers that provide slave accessories throughout the building, or an independent emergency that includes lights, batteries, chargers, and lighting. Accessories to construct. controlling device.
Self-contained emergency lighting can be operated in either "hold" mode (always illuminated or controlled by a switch) or "not held" mode (lights only when normal power fails).
Some emergency lighting manufacturers provide dimming solutions for emergency lighting in public areas to save energy for building owners without the use of embedded sensors.
Another popular approach for lighting designers, architects and contractors is to install spare battery ballasts in or near existing lighting. Once the power loss is sensed, the ballast switches to emergency mode, which converts existing lighting equipment into emergency lighting equipment to meet NFPA‘s Life Safety Code and National Electrical Code without the need to connect separate circuits or external Wall mounts.
Operating specifications for remote installation of emergency lighting equipment typically require that the wiring from the central power source to the emergency lighting equipment be isolated from other wiring and constructed in fire resistant cable and wiring systems.
The Code of Practice sets out the minimum level of illumination for escape routes and open areas. The practice guidelines also specify requirements for the location of emergency lighting fixtures.
The latest operating specifications require designers to consider both the power failure of the building and the failure of a single lighting circuit.
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Linsheng Analysis Modern Emergency Light Design Requirements
原文：https://www.cnblogs.com/bertlinsheng/p/11791135.html