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Selection of Power Supply Mode for Emergency Lights in Civil Buildings

Mar, 22, 2022

Emergency lights refer to lighting facilities used under abnormal conditions, including: standby lighting, evacuation lighting, and safety lighting. The power supply time, conversion time and illuminance requirements of different types of emergency lights are clearly stipulated in the specifications.

1. Power supply mode of emergency light

The selection of emergency light power supply mode should consider various factors such as the type of emergency lamps, conversion time, continuous working time, characteristics of various power sources, and actual engineering requirements, so as to be safe, reliable, technologically advanced, and economical.

The first type of emergency light power supply is powered by an independent power supply from the grid, which requires two independent power sources to be drawn from the outside to ensure that when one fails, the other can continue to work. This kind of power supply has the characteristics of easy conversion time to meet the requirements, long continuous working time, and unlimited power supply capacity. This method is suitable for buildings with more types of emergency lights, more concentrated lamps, and larger scales. The second type is powered by diesel generator sets. This type of power supply is often set up in high-rise buildings to meet fire-fighting power requirements, and it is not economical to set up specially for emergency lights. The third is to use battery power supply. This method is suitable for buildings with a small number of emergency lights, scattered installations, and small scale.

2. The choice of emergency light power supply mode

In the actual engineering design process, due to the different requirements and application scope of the system, it is sometimes difficult to meet the requirements just to choose a certain type of emergency light power supply, and it is also difficult to achieve safety, reliability, and economical rationality. Therefore, the determination of the emergency light power supply mode should be combined with the comprehensive consideration of the fire power load, and two or more emergency light power supplies should be selected at the same time. There are not many emergency lights. The emergency lights of small-scale buildings are powered by their own batteries. Large-scale high-rise buildings and some particularly important buildings are powered by independent power grids, equipped with generators or battery packs, or used by a power supply method that combines a generator set with its own battery.

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