What are the installation requirements for fire emergency lights and safety evacuation signs?

A, fire emergency lighting installation specification

1, the common double-headed fire emergency lighting is generally installed above the door frame of the exit of the evacuation passage, on the wall of the corridor and exit walkway, about 2 meters away from the ground; In large electronic markets, shopping centers and other places, double-headed emergency lights are directly installed on the columns.

2. The installation position of fire emergency lights should prevent being hit by objects. If it is installed too high, it will affect the light efficiency of lighting brightness during power failure, and it is not convenient to maintain and debug emergency lights.

3. The height of the double-headed fire emergency lighting can be about 2.2 meters; It also depends on the actual situation of the place of use. When the use space is large and the use density of emergency lights increases, the installation height can be adjusted appropriately. The prerequisite must comply with the relevant provisions of the fire inspection department;

Second, the fire emergency exit indicator lamp installation specification

Fire emergency exit lights can be divided into safety exit sign lights and evacuation passage indicator lights.

1, the installation position of the safety exit sign light is usually at the exit of the normal exit and emergency passage leading to the outside in the building. Each floor of multi-storey and high-rise buildings leads to the stairwell and the front room of the fire elevator; Evacuation passages and exits from large halls, venues and exhibition halls to front halls, side halls and stairwells;

2. The exit light is usually installed above the exit door frame. If the door frame is too high, it can be installed on the side of the door frame. In order to prevent the smoke generated in the fire from affecting the vision, the installation height should be 2.2-2.5 meters;

3. The installation position of the fire safety indicator light is usually in the safe evacuation passage in public buildings, so that the correct emergency exit can be found no matter where. The distance between the emergency evacuation indicators installed in the fire emergency evacuation passage or the safe emergency exit passage should not be more than 20m.

4. The front picture of the emergency exit indicator light should be as vertical as possible with the emergency evacuation passage.

Extended data:

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.

Name: fire emergency light

Protection grade: IP65

Anticorrosion grade: WF2

Explosion-proof mark: ExdIICT4

superiority

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

Its principle can refer to the principle of electromagnetic relay, and the two are similar.

principle of operation

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 will keep 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.

References:

Baidu encyclopedia-fire emergency light