What is the emergency lighting time of the fire emergency light?

Abstract: What is the emergency lighting time of fire emergency lights? Fire emergency lights are reliable, stable and long in service life, and are suitable for high-rise buildings such as factories, hotels, shopping malls and buildings. Used for emergency lighting in case of power failure, it adopts metal lamp holder or flame-retardant plastic lamp holder, and its installation methods are wall-mounted, portable and suspended. Emergency time ≥90 minutes. Generally, special fire emergency lights have their own batteries, which are usually charged after wiring and sending, and basically the power consumption can be ignored. Let's take a closer look. Fire emergency lights are made of industrial plastics and high-brightness bulbs. The color is mainly white with two arrows on the surface. The material is non-aging, with fast heat dissipation and impact resistance. Fire emergency lights have wall-mounted, portable and suspended installation methods.

fire emergency light

Protection grade: IP65

Anticorrosion grade: WF2

Explosion-proof mark: ExdIICT4

Advantages of fire emergency lights

It has the advantages of reliable work, high stability and long service life. Suitable for factories, hotels, shopping malls, buildings and other high-rise buildings. It is used for emergency lighting in case of power failure. Metal lamp holder or flame-retardant plastic lamp holder is adopted, and there are wall-mounted, portable and suspended installation methods. Emergency time ≥90 minutes.

Working principle of fire emergency light

1 battery charging circuit

The external power supply charges the battery with constant current through Q2, Q6, R8 and D 10. When there is an external power supply, the charging current charges the battery through R8 and D 10, and lights the charging indicator D 12.

2. Lamp control circuit

It consists of Q3, Q5, Q7 and K and G keys. When there is no mains supply, press the K(ON) key once, and Q5 will be saturated and turned on. The collector current of Q5 keeps Q7 conductive through R 12. The reverse breakdown of D 1 1 works in a stable voltage state. The collector voltage of Q5 provides bias for Q3 and Q4, making them turn on and lighting L 1 and L2. When the G key is pressed once, Q7 is turned off, Q5 is turned off, and the light is turned off.

When there is commercial power, the external power supply turns off D7 in reverse through D9, and Q5 cannot be turned on. Neither the keys K nor G can control the lights Ll and L2 on and off.

After power failure, the negative potential of diode D7 is zero, diode D7 is instantly turned on in a positive direction, and Q5 is saturated and turned on, which constitutes the lighting circuit condition, and L 1 and L2 are lit.

After a power supply, the negative potential of D7 becomes high and turns off in reverse, Q5 turns off and the lamp goes out (which plays the role of automatic control). In the lighting control circuit, D7 and Q7 work in the critical state through R6, and the on-off keys K and G only play a triggering role.

3. Test the circuit

When the test key S is pressed, Q 1 will be turned off, the negative potential of D7 will become low, and the positive bias will be turned on, so Q5 will be turned on to meet the lighting conditions, and L 1 and L2 will be turned on. Release the S key and the light will go out. The function of the test circuit is to test whether the lighting circuit is normal.

4. Power supply circuit

The 220v alternating current is transformed, rectified and filtered by the transformer, and then the Ql collector outputs 4.6V DC voltage. It is mainly provided for the charging circuit to charge the battery. D 14 is illuminated by R9.

5.K-barrier display circuit is composed of D 13, Q8, R 17 and D 1 1. If the external power supply voltage is too high, Q8 will be turned on, and D 13 will light up the voltage fault.

Emergency time of fire emergency lights

In the 2005 edition of Code for Fire Protection Design of High-rise Civil Buildings, it is said that emergency lighting and evacuation signs can use batteries as backup power supply, and the continuous power supply time is not less than 20 minutes; /kloc-the continuous power supply time for high-rise buildings above 0/00 meters should not be less than 30 minutes, but the current code stipulates that it is 90 minutes.

The emergency time of fire emergency lights varies from product to product.

The emergency time of emergency lights depends on the requirements of the place of use and the fire safety protection level.

Although the emergency lighting time of some other brands of fire emergency lights can also reach this length, they really enter the emergency lighting state when the fire emergency lights stop being connected to the external power supply. After working for 60 minutes, the lights appear dim, the light emitted by the lamps is obviously weakened, and the light penetration suddenly drops, which fails to achieve the effect of emergency lighting and greatly reduces the level of fire safety protection.

Strictly speaking, as long as it is a fire emergency light, it enters the normal emergency lighting working state after power failure, and the lighting lamp appears dim within a predetermined time, it cannot be counted as the normal working time of the emergency light;

The emergency lighting time of the fire emergency light is related to the power of the light source configured by the fire emergency light itself and the power of the battery pack matched with the emergency light.

The emergency time of some brands of fire emergency lights exceeds 30 minutes; These factors should be selected based on the specific use environment of emergency lights and the current actual safety protection level.

How to turn off the fire emergency light

Special lamps for fire emergency generally have their own batteries, which are usually charged after wiring and power transmission, and the power consumption can be basically ignored. Once the power is cut off, the lamp will start the power supply lighting of the emergency battery, which will usually be turned off after 60-90 minutes of power consumption. When the power is not connected, the experiment button is disposable, so it is best not to touch it, otherwise it will not stop once it is started.

Some emergency lights have a test button on the shell, which can control the emergency lights to turn on or off when they are not connected to the lighting power supply.