Construction elements of integrated wiring in automatic fire alarm system

As people's living standard is more and more high, intelligent, automation equipment technology is more and more mature, integrated wiring system can resist external invasion and avoid external harm has become a new goal of attention. People increasingly rely on fire, but also more and more harm by fire, the comprehensive wiring system of fire safety has become the content of people's attention.

The external fire will destroy the integrated wiring system, cause transmission interruption, at the same time, the integrated wiring system in flames, more or less harmful gas, smoke, may also help the fire gradually spread to other floors or other rooms, so the integrated wiring system in the initial stage of construction needs to take into account these problems, and try to solve. Fire automatic alarm system in this process has played a key role, then in the integrated wiring, the fire automatic alarm system laying what needs to know and pay attention to it? Let's take a look at the following.

1, the fire automatic alarm system wiring, should conform to the existing national standards "electrical installation engineering construction and acceptance code" provisions. Wiring, should be in accordance with the current national standards, "Fire automatic alarm system Design Code", the type of wire, voltage grade check. Fire automatic alarm system transmission line and 50V power supply control line, should be used voltage grade not less than AC 250V copper core insulated conductor or copper conductor cable. The AC 220/380v power supply or control line shall be made of copper conductor insulated conductor or copper conductor cable with voltage grade not less than AC 500V.

2, fire hydrant pump, spray pump and other wiring: pump motor distribution lines are often used flame retardant line through metal pipe and buried in the non-combustion body structure, or the use of fire-resistant cable and with fire-resistant cable tray, or the use of mineral insulated cable. The power supply of the pump room is generally provided directly by the high building substation. When the substation and the water Pump room adjacent to the same fire zone, the use of fire-resistant cable or fire-resistant busbar along the fire-resistant cable bridge to the Ming, when the substation and the water Pump room farther away from the different fire zones, can use mineral insulated cable.

3, the fire automatic Alarm system transmission line threading duct and low-voltage distribution system, the thread catheter is the same, should be used metal tube, flame-retardant treatment of hard plastic pipe or closed wire groove, and so on, the laying of the way to apply or dark. When the use of hard plastic pipe, the application of flame retardant, its oxygen index requirements are not less than 30, such as the use of line slot wiring, the requirements of closed fire-proof groove. If the use of ordinary wire groove, the cable groove in the trunk system, this cable should choose fire-resistant type. When laying in the Ming Dynasty, the metal pipe or metal wire groove shall be used for protection, and the fire protection measures shall be taken in the metal pipe or metal wire groove. When using the flame-retardant cable, the metal tube can be protected, but it should be laid in the cable shaft or ceiling with fire protection measures in the closed groove.

4, fire control, communication and alarm lines and fire automatic alarm system transmission line comparison, more important, so this part of the threading of the choice of more demanding, only in the dark to allow the use of flame-retardant hard plastic pipe, in other cases can only use metal pipe or metal wire groove. Conduit for fire control, communication and alarm lines, generally required laying in the non-combustion structure layer, the thickness of the protective layer should not be less than 30mm, because the pipeline can play a protective role in concrete, prevent fire control, communication and alarm line interruption, so that the fire extinguishing work can not be carried out, resulting in greater economic losses. When the application of the prescribed should be metal pipe or metal wire groove protection, and should be in metal pipe or metal wire groove to take fire prevention measures. From the eye line situation, the main fire prevention measures are in the metal pipe, metal wire groove surface coating fire retardant.

5, the Fire automatic alarm system for the cable shaft, suitable for electric power, lighting and low-voltage distribution line cable shaft set respectively. If the conditions are limited to be combined, the two cables should be arranged on both sides of the shaft respectively. The main purpose is to prevent the interference of the strong electric system to the fire automatic alarming equipment of the weak electricity system. It is not advisable to lay the cable of the automatic fire alarm system and the high-voltage power cable in the same shaft.

6, fire detector transmission lines, it is advisable to choose different colors of insulated conductors or cables. The positive "+" line should be red, and the negative "-" line should be blue. In the same project, the same use of wire color should be consistent, wiring terminals should be labeled. The main purpose is to facilitate wiring and maintenance. In practical applications, some manufacturers of automatic alarm system transmission bus is no longer divided polarity, which is very convenient for construction, but the transmission bus and 24 volts power line and linkage equipment line or to distinguish the color, will give the construction and commissioning is very convenient.

7, terminals in the terminal box should choose to press or solder solder points of the terminal plate, its terminals should be the corresponding marking. At present, the technology of crimping has been widely used in construction, and the reliability of operation can be improved by using press connection.

8, different systems, different voltage levels, different current categories of lines, should not wear in the same pipe or groove in the same slot.

9, other fire fighting equipment wiring: Fire accident broadcast, fire fighting telephone, fire alarm equipment, such as electrical wiring, when conditions allow the first use of flame retardant wire wear protection pipe dark, when the use of clear line, the line to do fire-resistant treatment or consider the above fire-resistant heat-resistant wiring measures.

10, fire elevator wiring: Fire elevators generally by the lower floors of the substation to lay two special lines to the elevator room located in the top floor, because the line is longer and more complex routes, fire elevator power distribution lines should be used fire-resistant cable; when there is special reliability requirements, the two distribution lines can be used to select mineral insulated cables.

11, Fire emergency lighting wiring: The general use of flame-retardant wire to wear metal tubes in the structure and the thickness of the protective layer (30mm, in the decoration works, when the emergency lighting line can only be applied to the ceiling, should be used heat-resistant or fire-resistant wire and consider fire-resistant wiring measures.

12, fire automatic alarm system after the wire laying, should be used for each circuit wire with 500V trillion euro meter to measure the insulation resistance, its insulation resistance value should not be less than 20mω. This is according to the state's current standard GB4717 to the controller insulation requirements, make corresponding provisions.

13, the introduction of the controller of the cable or wire, should meet the following requirements: wiring should be neat, avoid cross, and should be fixed securely, cable core and the wiring of the end of the wire, should be marked number, and the same as the drawings, legible handwriting is not easy to fade; terminal Board of each terminal, wiring shall not exceed 2; cable cores and conductors, Should be left in no less than 20cm allowance, wire should be lashed into bundles, lead wire threaded, in the conduct of the tube should be blocked.

14, smoke-proof device wiring: Smoke-proof device distribution lines, when the use of refractory-type XLPE low-voltage cable or mineral insulated cable, when the dark can be used in general fire-resistant cable. Anti-smoke device linkage and control line, the use of fire-resistant cable. The line of smoke control device should be cut as long as possible to avoid crossing different fire zones.

15, Fire shutter door wiring: Fire shutter door power is usually quoted from the floor distribution box with dual power supply switch, the fire shutter door special distribution box with radial or ring-type to its control box power supply. When the fire shutter door horizontal distribution lines longer, it is advisable to use fire-resistant cable and in the ceiling of the use of fire-resistant cable bridge frame.

To sum up, fire automatic alarm system on the power supply and cabling requirements relative to some lighting, power system will be relatively high, so in the design of this system, must be in accordance with the relevant standards to implement, do not arbitrarily modify or reduce its standards, otherwise, disastrous consequences. With the development of economy, information system is becoming more and more popular, and the integrated wiring system has developed from the bud of 20 ago to the technical maturity, and the information system, security system and automatic fire alarm system are ubiquitous in people's daily life. When people can achieve high stability and high reliability integrated wiring system by means of technology, the integrated cabling technology becomes the infrastructure of intelligent and automation system.