How do you connect two 12V batteries?

Emergency lighting refers to the lighting used to ensure the effective identification and use of evacuation passageways, the safety of personnel in potential danger and the continuation of normal activities in the case that the normal lighting system has to be cut off due to failure or the normal power supply and no longer provides normal lighting. It includes: evacuation lighting, safety lighting and standby lighting. There are many ways to design emergency lighting. However, it is very important to design the emergency lighting system scientifically and perfectly in the concrete project. For some of the automatic fire alarm system is not set up and the installation of emergency lighting lamps and lanterns are few and scattered, small buildings, designers often use their own battery lamps and lanterns as emergency lighting.

1, the battery emergency lighting control principle

The control of an emergency light with a battery is simple: with battery according to normal lighting the lamp is normally illuminated and a charging line is connected to the top of the lighting control switch. Normally according to the normal lighting control, when the power failure emergency lighting will automatically lit. Maintain at ordinary times, every once in a while will lighting distribution box outlet circuit breakers to disconnect, emergency lights light up, the battery discharge is activated, after the battery discharge, closed circuit breaker.

Although emergency lighting can be controlled in many ways, the principle is the same. When manual operation is carried out, press the light switch button S1, the contactor coil KM is energized, its normally open contact is closed, the contactor completes self-locking, and the lamp is lit; when automatic, the automatic fire alarm linkage contact K receives the signal from the fire detector and then closes to make the contactor coil KM energized. Its normally open contact closes, the contactor completes self-locking, and the lamp is lit. After pressing the light off button S2, the contactor coil loses power, its normally open contact is restored, and the controlled light is off.

2, Set up automatic alarm system of emergency lighting lamps and lanterns control and wiring

Evacuation indicator light in the practical engineering is normally on, so it is not automatic light problems. As the normal lighting emergency lighting lamps and lanterns, due to its controlled by the switch, its status is uncertain, this request in the fire to make it all light up.

3, Emergency lighting lamps and lanterns of the commonly used control and wiring

Common control and wiring of battery emergency lighting fixtures, compared with general lighting wiring, a control line and the main contact of the ac contactor in series are added to the outgoing circuit at first, and the charging line is protected by a fuse.

4, Control and wiring of emergency lighting without automatic alarm system

For buildings without automatic fire alarm system, how to force emergency lighting to start in case of fire has been debated on BBS, which also makes designers confused. First of all, we have to clear a concept, fire emergency lamps and lanterns are required to be lit compulsively rather than automatically in case of fire. Only when this point is made clear can mandatory lighting of emergency lamps and lanterns without automatic fire alarm system be meaningful. Therefore, for emergency lamps and lanterns, are not automatic fire alarm system in the fire we must artificial light make it mandatory, the relevant staff can set force emergency button in power distribution box to light up the compulsory implementation emergency lamps and lanterns. But fire officials are not necessarily right in this building, when workers ran to the building of distribution box to force light may be too late, so for buildings without fire automatic alarm system, fire emergency lighting lamps and lanterns of forced light, it’s the most reliable by an ordinary staff in the building. Here are combined with the idea of no fire automatic alarm system of emergency lighting lamps and lanterns lit for the following discussion.

Emergency light adopt energy-saving self-extinguishing type switch (electronic touch time switch, vibrating timer switch, acoustic time switch), the usual energy-saving switch control, fire emergency, the staff can make through strong in power distribution box, and button S1 forced light emergency lighting lamps and lanterns, at the same time we ordinary people also can through the press in conspicuous position of emergency throughout we strong rev button S3 strong rev. Emergency lighting lamps and lanterns, and when emergency situation needs to be relieved, staff according to sets in power distribution cabinet rev button S2 can lift the emergency.

When designers do not use energy-saving self-extinguishing type switch, and use ordinary panel switch control and emergency lighting lamps and lanterns, just put the time switch into ordinary panel switch.

1, 12-volt batteries can be used in tandem to form a 24-volt battery. Specific connection method is: the negative pole of A battery and the positive pole of B battery are connected, the positive pole of A battery and the negative pole of B battery is 24V.

Series 2, Note when using in series:

(1), Capacity of two batteries to be equal.

(2), Old and new degree of the two batteries should be consistent, otherwise it will affect the battery life.

Expand the data

Several circuit elements are connected to each other along a single path, with each node connected to a maximum of two elements in series. A circuit connected in series is called a series circuit.

The current flowing through each resistance in a series circuit is equal. As in the direct current circuit, each section of the same branch has the same current intensity.

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