The emergency lighting power supply is a state in which the normal power supply no longer provides the minimum brightness required for normal lighting, that is, when the normal lighting power supply voltage drops below 60% of the rated voltage, the power is switched to the emergency lighting power supply. Emergency lighting power can be roughly divided into the following types:
(1) A feeder line from the power grid that is effectively separated from the normal power source.
(2) Diesel generator sets.
(3) Battery pack: It is divided into the following cases:
1 lamp with its own battery, that is, its own power supply emergency light.
2 Centrally set battery packs.
The battery packs are set in 3 zones.
(4) Combined power supply: It is a combination of any two of the above and three power supply modes.
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