Emergency Light Suppliers-How To Control: Emergency Lighting Fixtures

With a reliable power supply, wiring, and lamps, if it can't be lit in time in a fire, everything is futile. For buildings of different nature, or different places in the same building, there may be multiple ways to control the lamps. The key is that the designer must have a clear design idea. First, the normal state of lamps in various places should be clarified, followed by control points. Some are controlled by the on-site switch panel, some are centrally controlled in the distribution box, and those with a consumer control center should also be forced to switch on (note that it must not Only the control is switched on and there is no local control point to prevent the failure of the control), and the design intention should be expressed in the control wiring diagram and corresponding to the circuit of the power distribution system. During the review, it was found that many projects did not do this, and the number of wiring cores in the plan was confusing. As a result, the inspector or fire-fighting inspector could not read the drawings if he saw the drawings, and it was difficult to accurately determine whether they were correct. Not to mention how the construction and installation personnel correctly wired, how the management staff correctly operate, and how to light up in time when there is a fire is even more problematic. So it should be paid enough attention.

The control wiring of emergency lighting fixtures prompts some often overlooked problems.

1. The charging cable with battery emergency light should not be pulled off under any circumstances. We know that the function of the charging cable, except for charging the battery (floating under normal conditions), loses the power of the charging cable. If the brake is operated by mistake, the lamp will exhaust the battery energy and cannot be recharged in time. At this time, if a fire occurs, the lamp cannot be lit. This is not allowed, so the design should indicate which is the charging line switch. And indicate "Do not pull the brake". The sign box of the distribution box should also be clearly marked.

2. The circuit of the charging line or contactor should have a line protection switch.

3, the installation of emergency lights below 2.4 meters should be assigned to the PE line, these 3 points are any control wiring plan must follow the basic requirements.

In addition, the "Civil Regulations" Appendix C.3.2 stipulates that the evacuation lighting should always be on. The author understands that the safety exit lights and evacuation induction lights should be lit or called "constantly lit" when external light is insufficient to identify "Always on" does not exclude that the gate can be opened at night when there is no activity, on holidays, or during the day when there is sufficient natural lighting. Therefore, in the project without automatic fire alarm system, for the centralized control of the distribution box and the battery lamps in the circuit, three wires (that is, the charging line is equipped) and two switches (the independent switching of the charging line for protection) should be used. PE line to ensure that the charging line is not pulled off when the power switch is turned off under any circumstances.

The centralized operation scheme in the distribution box is generally suitable for daily public buildings that are managed and managed in place, and for general unmanaged locations, such as rented office buildings, stores, and residences, you can also consider setting up local switches. At this time, the power distribution system can use two-wire one-switch wiring, but the power switch must be normally closed (the design should be noted) and the charging line with the battery lamp in the circuit should be led in front of the local switch to prevent the charging line from being local. The switch is off, but centrally controlled luminaires cannot be included in the circuit. In order to make it easy for firefighters or firefighters to quickly identify and operate the switch panel in the fire, the local switch for emergency lighting should choose a model with a power indicator. In a sense, this switch is a fire fighting equipment , Should be clearly marked.

For projects with fire control rooms, forced emergency lighting is a function of automatic fire alarm. The emergency lighting box power distribution system and its wiring scheme should be matched with it. There are basically two modes: one is centralized control in the power distribution box and the consumer control center, and the other is forced connection by the local panel switch and the fire control center. Two lamps with different control methods should not be mixed in the same circuit. Normally, it must be always dark, and the lamps that are only switched on during a fire should not be in the same circuit as the normal light, and generally should be independent circuits. During the review, many similar principles were found to be wrong. For example, the emergency lighting above a stage cannot be kept on because of the special function of the stage, but it is designed to be connected to the centralized control with evacuation induction lights and exit sign lights. Because the latter must always be on, it is contradictory and cannot be controlled. Another example is a double-headed emergency light in a library reading room as an emergency light. This light cannot be used as part of normal lighting. It can only be forced to fire in a fire, but it will appear on the circuit of the corridor safety exit light. Same mistake.

It is controversial to use acousto-optic control panel switches as switches for emergency lighting. The author believes that some specific places can still be used, such as smoke-proof in high-rise residential buildings or emergency lighting in enclosed staircases. Because no one is usually walking, they do not need to be constantly lit. At the same time, people are familiar with the environment and understand the sound. Turn on the lighting, especially in a fire, and it is easy to light up. However, public places are not suitable. For example, in an intermediate court, all the aisles on all floors use this kind of switch. Obviously, it is sometimes bright and dark, which is not suitable at all. Therefore, you should be very careful and not abuse it.

Regarding the use of "cut off" to implement the control of forced connection, it is also quite controversial. Here are some points to note:

1. "No-fail" and forced connection may not guarantee synchronization in time. "Defying" is usually performed by the control room after the fire is confirmed. In a project without an automatic fire alarm system, it is generally necessary to wait for the firefighters to arrive at the scene and then cut off at the switch box.

2. In order to light the emergency lighting by "cutting the wrong" method, all the lamps and lanterns must bring their own batteries, the cost is high, and the lamps and lanterns should be in a normally dark state.

3. The power supply of the lamp is not from the emergency lighting box, but must be connected to a non-fire lighting box.

4. The normal lighting of the place before "cut off" must be lit to provide the earliest evacuation lighting for the fire before "cut off".

In view of these four points, its applicable places are greatly restricted. However, it does not rule out the fire emergency lighting of some specific projects and specific parts. After taking the above four factors into consideration, adopting "cut-off" measures can solve the forced lighting and meet the fire protection requirements. In short, it should be based on the principles of specific problems, specific analysis, and seeking truth from facts.

Linsheng is a professional manufacturer specializing in R & D, production, sales and service of auto parts and power tools. Production of emergency lights, spotlights, jumpers, etc. We can provide you with high-quality electrical products. Is one of China's professional   Emergency Light Suppliers     .