Learning requirements:
understand the composition, classification of fire automatic alarm system and classification of fire detectors;
master the design of fire automatic alarm system, the design of fire linkage control system, the composition and design of combustible gas alarm system, the composition and design of electrical fire monitoring system, the design of fire control room
1-1 The concept, composition and working principle of fire automatic alarm system
1-1 The abbreviation of fire detection alarm and fire linkage control system, is an automatic fire protection facility that realizes early detection of fire and
alarm, sends control signals to various types of fire equipment and receives and displays feedback signals of equipment, and then realizes the predetermined fire protection function as the basis of this task.
fire automatic alarm system consists of fire detection alarm, fire linkage control, electrical fire monitoring system and combustible gas detection and reporting
alarm system.
's purpose is to detect and report fires in the early stage, and take effective measures in a timely manner to control and extinguish fires and reduce losses.
Fire detection alarm system
Fire detection alarm system is a system that realizes early detection of fire and issues fire alarm signals. It is generally composed of fire triggering device
(fire detector, manual fire alarm button), sound and light or light alarm, fire alarm controller, etc.
trigger device
trigger device is a device that automatically or manually generates fire alarm signals in the fire automatic alarm system. Fire detectors,
water flow indicators, pressure switches, etc. are automatic trigger devices. Manual alarm buttons, pump start buttons, etc. are trigger devices that manually send signals and fire alarms through
. When designing the automatic fire alarm system, the two triggering devices of automatic and manual should be set according to the specifications
, especially manual alarms are reliable and easy to operate, which is a necessary function for the system.
Fire alarm device
Fire alarm device: In the fire automatic alarm system, it is used to receive, display and transmit fire alarm signals, and can send
control signals and control indicator devices with other auxiliary functions. The fire alarm controller is the most popular type of fire alarm devices.
fire alarm controller provides a stable working power to the fire detector; monitors the working status of the detector and the system itself;
receives, converts, and processes the alarm signals output by the fire detector; issues sound and light alarms; indicates, store the specific parts of the alarm and the time of the
; performs corresponding control and other tasks, which are the core components of the fire alarm system.
working principle of automatic alarm system
2-1 Constitution of automatic fire alarm system
Constitution of automatic fire alarm system
0 According to the set fire safety objectives, the specific situation of the building and the functions of the system, the system is selected in different forms:
1) Regional alarm system;
2) Centralized alarm system;
3) Control center alarm system.
2-1 The composition of the automatic fire alarm system
2.1 Regional alarm system
system composition
(1) should be composed of a fire detector, manual fire alarm button, fire sound and light alarm, and regional fire alarm controller, etc.
This is the minimum composition requirement of the system;
(2) The fire control room graphic display device and the area display indicating the floor can be added as needed;
(3) When the fire control room graphic display device is not set, a fire alarm transmission device should be set.
The composition of the automatic fire alarm system
2.2 Central alarm system
1) The composition of the system
(1) The system should be composed of a fire detector, manual fire alarm button, fire sound and light alarm, fire emergency broadcast, fire special
using telephone, fire control room graphic display device, fire alarm controller, fire linkage controller, etc., which is the most
group requirement of the system;
(2) You can choose a combination of a fire alarm controller and a fire linkage controller or a fire alarm controller (linkage type).
2) System selection requirements
is suitable for not only requiring alarms but also requiring linkage of automatic fire equipment, and only one fire
disaster alarm controller and fire linkage controller with centralized control function should be set up, and a fire control room should be set up.
Understanding of "setting only one fire alarm controller with centralized control function"
centralized alarm system can be composed of two or more fire alarm controllers and fire linkage controllers, but only one fire alarm controller with centralized alarm function and a fire linkage controller with centralized control function can be set up.
for the dedicated manual control of fire protection facilities such as water pumps and fans in buildings must be realized by the controller that plays a centralized control role;
for the bus linkage control of automatic fire protection facilities such as water pumps, fans, electric smoke exhaust valves, smoke blocking walls, etc., it can be realized by other controllers of
according to actual conditions.
2.3 Control Center Alarm System
1) System Selection Requirements
(1) Two or more fire control rooms are set up;
(2) or two or more centralized alarm systems have been set up. The diagram of the
system is as follows:
2) Design requirements for the fire control room of the control center alarm system
(1) When two or more fire control rooms are set up, a main fire control room should be determined;
(2) The main fire control room should be able to display all fire alarm signals and linkage control status signals, and should be able to control important disinfection
0 protection equipment;
( 3) The fire-fighting equipment in each sub-fire control room can transmit and display status information, but should not be controlled by each other;
(4) Fire-fighting equipment such as water pumps shared by the system should be unifiedly controlled by the highest-level fire-fighting control room, and the building complex can be controlled by the sub-fire control room near
, and the main fire-fighting control room is controlled by the cross-regional linkage;
(5) Fire-fighting equipment such as smoke-proof fan can be controlled by the corresponding fire-fighting
control room according to the control scope of the building fire-fighting control room.
2.4 Selection of automatic fire alarm form
only needs to alarm, and protection objects that do not require linkage use a regional alarm system.
not only requires an alarm, but also requires linkage. It only needs to set up a centralized alarm to adopt a centralized alarm system, and
should be set up to set up a disinfection room.
Set two or more fire control rooms or set up two or more centralized alarm systems protection objects, and use the control center alarm
system
3-1 Division of alarm areas
Alarm area should be divided according to fire zone or floor; a fire zone or floor can be divided into an alarm area
domain, or several adjacent fire zones or floors that need to be linked to fire equipment at the same time when a fire occurs can be divided into an alarm area
domain. An alarm area of a cable tunnel should be composed of a closed length interval, and an alarm area should not exceed 3
closed length intervals connected; the alarm area of a road tunnel should be determined according to the linkage needs of the smoke exhaust system or fire extinguishing system, and should not exceed 150 m than
. The alarm area of Class A, B and C liquid storage tank areas should be composed of a storage tank area, and each
outer floating roof storage tank with 50,000 m3 or above should be divided into an alarm area separately.
The alarm area of the train should be divided according to the carriage, and each carriage should be divided into an alarm area.
4-1 Dividing of detection areas
Detection areas should be divided into separate rooms (sets). The area of a detection area should not exceed 500m2; a room with the interior of
can be clearly seen from the main entrance and the area does not exceed 1000m2 can also be classified as a detection area. The length of the detection area of the infrared beam-sensitive fire detector and the
cable-type linear temperature sensing fire detector should not exceed 100m; the length of the detection area of the air pipe differential temperature fire detector should be 20 ~ 100m.
should be divided into places where the detection area is separately:
open or closed stairwells and smoke-proof stairwells, which are places directly related to evacuation.
smoke-proof stairwell front room, fire elevator front room, fire elevator front room, fire elevator front room, walkway, and ramp used in combination with the fire elevator and the smoke-proof stairwell are places directly related to evacuation.
Electrical pipeline wells, communication pipeline wells, and cable tunnels are hidden parts.
5-1 Detector classification and basic working principle
trigger device
trigger device refers to a device that automatically or manually generates alarm control signals in a fire automatic alarm system. It mainly includes fire
disaster detector and manual fire alarm button.
fire detector is a device that can respond to fire parameters (such as smoke, temperature, light, flame radiation, gas concentration, etc.) and automatically generates a fire
disaster alarm signal.
Manual fire alarm button is a device that manually generates a fire alarm signal and activates the fire alarm system.
manual alarm button
button surface is equipped with a plexiglass tablet. After pressing the tablet, you can use special tools to reset
fire hydrant alarm button. Two light-emitting diodes are installed. One is used to display the alarm status. The other is used as a fire water pump to start back to
Answer signal indicating
Fire detector classification
According to different parameters of fire detection, the detector is divided into: smoke detector, temperature sensing detector, photosensitive detector, composite probe
detector and combustible gas detector
temperature sensing fire detector: a detector that responds to abnormal temperature, temperature rise rate and temperature difference changes.
smoke-sensitive fire detector: a detector that responds to solid or liquid particles generated by combustion and/or pyrolysis suspended in the atmosphere.
can further be divided into ion smoke, photoinductor, infrared beam, air-absorbing and other fire detectors,
photosensitive fire detector: a detector that responds to specific bands of electromagnetic radiation emitted by flame, also known as flame detector, divided into purple
external, infrared and its composite
gas fire detector: a fire detector that responds to gas generated by combustion or pyrolysis.
composite fire detector: a detector that focuses on multiple detection principles, which can be further divided into smoke temperature composite, infrared
ultraviolet composite and other fire detectors.
Ion smoke detector working principle
Photoinductor smoke detector working principle
Fire detector According to different categories of its monitoring range
Fire detectors are divided into point fire detectors and linear fire detectors according to their monitoring range.
point fire detector: a detector that responds to the characteristic parameters of the fire near a small sensor.
Linear Fire Detector: A detector that responds to the characteristic parameters of fire near a continuous route.
Performance indicators of fire detector
working voltage and tolerance
response threshold
monitoring current
maximum alarm current
alarm current
working environment conditions
detector classification and basic working principle
basic principle of fire detection
fire development process curve
general design principles for selection of fire detectors
When selecting a fire detector, it should be decided based on the formation and development characteristics of the possible initial fires in the detection area, the height of the room
degrees, environmental conditions, and the reasons for false alarms.
has a smoldering stage in the early stage of the fire, producing a large amount of smoke and a small amount of heat, and there is little or no flame radiation. You should choose a
-sensing fire detector. For places where fires develop rapidly and can generate a large amount of heat, smoke and flame radiation, you can choose a temperature-sensitive fire detection
detector, a fire-sensitive fire detector, a flame detector or a combination thereof. For places where fires develop rapidly, with strong flame radiation, a small amount of smoke, and
heat, a flame detector should be selected.
For places where there is a smoldering stage in the early stage of the fire and requires early detection, a carbon monoxide fire detector should be added.
For places where combustible gases or combustible steam are used and produced, combustible gas detectors should be selected.
should analyze the parts and combustion materials where fires may occur in the protection site, and select the corresponding fire detector according to the type of fire detector, sensitivity and response time.
Point fire detector selection
It is not advisable to choose a spot for point ion smoke detector:
1 Relative humidity is often greater than 95%;
2 The air flow velocity is greater than 5m/s;
3 There is a lot of dust and water mist retention;
4 may produce corrosive gases;
5 Smoke retention under normal circumstances;
6 produces alcohols, ethers, ketones and other organic substances.
Point fire detector selection
It is not advisable to choose a spot photoinductor smoke detector location:
has a large amount of dust and water mist retention; steam and oil mist may be generated; high altitude areas; under normal circumstances, smoke or steam retention
and other places where smoke or steam retention should not be installed in kitchens, boiler rooms, generator rooms, drying workshops, etc.; it is necessary to extinguish the "House
All Exit" sign light in a coordinated manner; the inside of the safe exit of the "House
Full Exit" sign light; no one else can do it; It is not suitable for installing fire detectors, but places where fires need to be alarmed in time when fires occur and basic working principle of
temperature sensing fire detectors are classified into differential temperature, fixed temperature and differential temperature detectors
linear types are divided into differential temperature, fixed temperature and differential temperature detectors
according to different thermal components, divided into bimetallic, semiconductor thermistor, membrane box, etc.
detector classification and basic working principle
application locations for temperature sensing detector
1 Relative humidity is often greater than 95%;
2 No smoke fire;
3 There is a lot of dust;
4 Under normal circumstances, there is smoke and steam retention;
5 Kitchen, boiler room, generator room, drying workshop, etc.;
6 Smoking room, etc.;
7 Other halls and public places where smoke sensing detectors are not suitable. Where
temperature sensing detector is not suitable for use
may cause smoldering or fires that cause major losses, it is not advisable to choose a point-type temperature sensing fire detection
device; where temperature is below 0 degrees, it is not advisable to choose a fixed temperature detector; where temperature changes are large, it is not advisable to choose a detector with differential windshield properties. Where may be caused by a small fire cannot be allowed to lose
Detector classification and basic working principle
Photosensitive fire detector
Where one of the following conditions meets one of the following conditions, it is advisable to choose a point flame detector or image flame detector:
1 There is strong flame radiation during fire;
2 Fire without smoldering stages such as liquid combustion fires;
3 It is necessary to make a quick response to the flame;
3 Places where point flame detectors and image flame detectors are not advisable to choose a point flame detector and image flame detector:
1 A flameless fire may occur;
2 There is thick smoke diffuse before the flame appears;
3 The lens of the detector is easily contaminated;
4 The detector's "line of sight" is easily blocked;
5 The detector is easily exposed to direct or indirect sunlight or other light sources;
6 Under normal circumstances, open flame operations and X-rays, arc lights, etc.
Where there are normally high-temperature objects in the detection area, it is not advisable to choose a single-band infrared flame detector.
The following places should choose combustible gas detectors:
places where combustible gas is used; gas stations and gas meter rooms, and places where liquefied petroleum gas tanks are stored; other places where combustible
gas and combustible steam are emitted; the following places where carbon monoxide is generated at the beginning of the fire can be selected:
places where smoke is not prone to convection or there is a thermal barrier under the ceiling;
places where other point fire detectors cannot be installed on the ceiling; places where multiple signals are composite alarms are required.
The following places should choose combustible gas detectors:
Where there are a lot of dirt and a fire-sensitive detector must be installed, a point-sampled and suction-sensitive fire-sensitive detector with interrupted inhalation should be selected. A point-sampled and suction-sensitive fire-sensitive detector with intermittent inhalation should be selected.
Linear Fire Detector
Linear Fire Detector Selection
Large unobstructed space or rooms with special requirements. Linear beam sensing fire detectors should be selected.
Where one of the following conditions is not suitable for choosing a linear beam-sensitive fire detector:
has a large amount of dust and water mist, which may produce steam and oil mist; smoke is retained under normal circumstances; the structure of a fixed detector will cause large displacement due to vibration and other reasons. The following places or places should be selected for cable linear temperature-sensitive fire detectors:
cable tunnel, cable shaft, cable mezzanine, cable bridge; interlayer and stuffy roof of point detectors are not easy to install; various belt
conveyor devices; other places where point detectors are not suitable for installation.
The following places or places should be selected as linear fiber temperature sensing fire detectors: petroleum storage tanks other than liquefied petroleum gas; flammable and explosive places where
is required to be installed; underground spaces where ambient temperature monitoring function is required should be installed, linear fiber temperature sensing fire detectors with real-time
temperature monitoring function; highway tunnels, railway tunnels with power cables are laid, and urban subway tunnels are installed. The choice of
linear fixed temperature fire detector should ensure that its non-operating temperature meets the requirements of the maximum ambient temperature in the setting site.
Absorbent fire detectors should be chosen in the following places:
places with high-speed airflow; large spaces where lit-type smoke-sensitive and temperature-sensitive fire detectors are not suitable for large spaces, above the stage, building heights of
or where there are special requirements; low temperature places; places where hidden detection is required; important places where early fire detection is required; places where personnel should not enter.
Where there is a lot of dust, you should not choose a pipe sampling style inhaled and inhaled smoke fire
detector without filtering net and pipeline self-cleaning function.
detector classification and basic working principle
composite detector
detects 2 or more fire parameters when a fire occurs, and is divided into 2 composite or 3 composite detectors.
can be divided into smoke-sensitive temperature-sensitive type, temperature-sensitive type, smoke-sensitive type, infrared beam smoke-sensitive type, etc. according to the fire detection characteristics.
composite detector not only makes the performance more reliable, but also expands the application range of the detector and can be applied to some special
places.
6-1 Design and Setting of System Equipment
6.1 Design Capacity of Fire Alarm Controller and Fire Linkage Controller
6.1.1 Design Capacity of Fire Alarm Controller
6.1.1 Design Capacity of Fire Alarm Controller
connected to the total number of detectors, manual reports and modules and addresses should not exceed 3200 points. The total number of connected devices in each bus loop
should not exceed 200 points, and a margin of no less than 10% of the rated capacity should be left.
6.1.2 Design capacity of fire linkage controller The total number of devices and addresses connected to
should not exceed 1600 points, and the total number of devices connected to each bus loop should not exceed 100
points, and a margin of no less than 10% of the rated capacity should be left.
6.2 Settings of fire alarm controllers and fire linkage controllers. The arrangement of fire alarm controllers and fire linkage controllers in the fire control room shall comply with the following provisions: The operating distance before the equipment disk
shall not be less than 1.5 m when arranged in single rows; and the arrangement of double rows shall not be less than 2m. On the
side where the on-duty staff often work, the distance between the equipment disk and the wall should not be less than 3 m. The maintenance distance behind the equipment should not be less than 1m. When the arrangement length of
of the device panel is greater than 4m, channels with a width of not less than 1m should be set at both ends. In the fire fighting
control room used in conjunction with other weak current systems in the building, fire fighting equipment should be centrally installed and should be significantly separated from other equipment.
6.3 Settings of fire detectors The protection area and protection radius of the detectors determine the number of set point fire detectors in the building. First, it is necessary to determine the protection area and protection radius of the detectors
. The protective area of a detector refers to the area that a fire detector can effectively detect, and the protection radius
refers to the maximum horizontal distance that a fire detector can effectively detect.
Table 6.2-1 Protective area and protection radius of point fire detector
Detector installation spacing
6.3 Number of detectors
Number of detectors
6.3 Number of detectors
The number of detectors that need to be set in a detection area should not be less than the calculated value of the following formula:
(2)
Where:
N——The number of detectors, should be taken as integers, only;
S——The area of the detection area, m2;
A——The protection area of the detector, m2;
K—— Correction coefficient, capacity exceeds 10 000 0.7~0.8 is suitable for public places where people can accommodate 2,000~10
0000 people. 0.8~0.9 is suitable for public places where people can accommodate 500~2,000 people. 0.9~1.0 is suitable for public places where people can accommodate
.
Example: A production workshop with a floor area of 30m×40m, with a roof slope of 15° and a room height of 8m. It is protected by a point
-type fire fire detector. How many fire detectors should be installed? How should these detectors be arranged?
set up fire detectors on the ceiling with beams should comply with the following regulations:
1) When the height of the beam protruding ceiling is less than 200mm, a point-type smoke-sensitive and temperature-sensitive fire detector is set up on the ceiling, which can ignore the impact of the beam on the detector's protective area.
2) When the height of the beam protruding ceiling is 200~600mm, the impact of the beam on the protective surface of the detector and the number of areas between beams that a detector can protect should be determined according to Figure 6.2-3 and Table 6.2-3.
Table 6.2-3 Determine the number of inter-beam areas protected by a detector according to the area area between beams
Q≤6 5
Q≤16 5
3) When the height of the beam protruding ceiling exceeds 600mm, at least one detector should be installed in each inter-beam area separated by the beam.
4) When the area partitioned by the beam exceeds the protective area of a detector, the area partitioned should be regarded as a detection area of
, and the number of detectors should be calculated according to Article 6.2.2, Paragraph 4 of the new "Fire Regulations".
5) When the net distance between beams is less than 1m, it can be regarded as a flat ceiling, regardless of the impact of the beam on the protective area of the detector.
6.4 Settings of manual fire alarm button
Each fire partition should set at least one manual fire alarm button. The walking distance from anywhere within a fire partition to the manual fire alarm button nearest to
should not be greater than 30 m. The manual fire alarm button should be set in the evacuation passage or the entrance of the
manual fire alarm button should be set in obvious and convenient operation. When installed by wall-mounting, the bottom edge of the ground should be 1.3~1.5 m, and there should be obvious signs.
6.5. Settings of regional displays.
. Each alarm area should be equipped with an area monitor (fire display disk); hotels, hotels and other places should set up an area monitor in each alarm area. When an alarm area includes multiple floors, it is advisable to set up an area display on each floor that only displays the
floor.
area display should be set in obvious and convenient parts such as entrances and exits. When installed by wall-mounting, the height of the bottom edge should be 1.3 ~ 1.5 m from
.
6.6 Setting of fire alarm
Setting of fire light alarms in a building should be set at obvious parts on the staircase entrance, fire elevator front room, building corner, etc. on each floor; considering that the light alarm cannot affect the effectiveness of evacuation facilities, it should not be set on the same wall as the safety exit indicator
lamps. Considering that the alarm signal can be heard in each alarm area to meet the requirements of informing all
personnel of fire. Fire alarms should be evenly set up in each alarm area. The sound pressure level requirements: the sound pressure level should not be less than 60 dB; in places with environmental noise greater than 60dB, the sound pressure level should be 15 dB higher than the background noise.
When the fire alarm is set on the wall, its bottom edge is greater than 2.2 meters
6.7 Settings for fire emergency broadcast
The rated power of each speaker should not be less than 3 W, and its quantity should ensure that the straight line distance from any part in a fireproof partition to the closest speaker is not greater than 25 m, and the distance from the end of the walkway to the closest speaker should not be greater than 12.5 m.
In places with high ambient noise and in places with greater ambient noise than 60 dB, the playback sound pressure level of the farthest point in its effective playback range
should be higher than the background noise of 15 dB.
6.8 Module Settings
The modules in each alarm area should be relatively concentrated in the metal module box in this alarm area to ensure the reliability of running
and the convenience of maintenance. Since the working voltage of the module is usually 24 V, it should not be mixed with equipment of other voltage levels. Therefore, it is strictly forbidden to set the module in the distribution (control) cabinet (box).
6.9 Wiring design requires that the transmission line of the fire automatic alarm system and the control line for power supply below 50V should be used for copper-core insulated wires or copper-core cables with a voltage level of no less than AC
300/500V. The power supply and control circuit with AC 220/380 V should be used, copper-core insulated wires or copper-core cables with voltage
level not lower than AC 450/750 V.
Copper core insulated wire and copper core cable core minimum cross-section
General principles for system wire laying
In the automatic fire alarm system, overhead laying is not allowed. The wiring design of the lines inside the house should be short and fast, safe and reliable, minimize crossing with other pipelines, avoid places with harsh environmental conditions, and facilitate construction and maintenance level of
. The system wiring should be taken to avoid parts that may form a "chimney effect" during fire.
The layout method of the transmission line of the automatic fire alarm system
The transmission line of the automatic fire alarm system should be wired through metal pipes, flame-retardant hard plastic pipes or closed wire troughs to protect the
protection method.
Fire-fighting power, control, communication and alarm lines laying methods
Only when the fire-retardant hard plastic pipe is allowed to be used when the concealed application is applied. In other cases, metal pipes or metal wire troughs can only be used. In other cases, metal pipes or metal wire troughs can only be used. Combustible gas detection alarm system
7.1 Combustible gas detection alarm system composition and working principle
7.2 System working principle
7.3 Combustible gas detector classification
7.3 There are 7 main types of combustible gas detectors, with a measurement range of 0~100 % LEL; independent combustible gas body detectors with a measurement range of 0~100 % LEL; measurement range of 0~100 % LEL; measurement range of 0~100 %LEL's portable combustible gas
body detector; a point-type combustible gas detector that measures artificial gas; an independent combustible gas detector that measures artificial gas; a portable combustible gas detector that measures
artificial gas; a linear combustible gas detector.
System Applicable Location
Combustible Gas Detection Alarm System is suitable for use, production or accumulation of combustible gas or combustible liquid vapors. Combustible gas concentration
0 degree detection. An alarm signal is issued before the leakage or accumulation of combustible gas concentration reaches the lower limit of explosion
7.4 Setting of combustible gas detectors requires
detection of combustible gas detectors with a gas density less than the air density should be set at the top of the protected space, and a combustible gas detector with a gas density greater than the air density should be set at the lower part of the protected space. When the detection gas density is comparable to that of the air density, the combustible gas detector may be arranged in the middle part of the protected space or at the top of the protected space.
The installation position of the combustible gas detector should be selected within 1m of a radius of 1m near the valve, pipeline interface, air outlet or places prone to leakage, and be as close as possible, but do not affect the operation of other equipment, and try to avoid high temperature and high humidity environments. When
combustible gas detector is used for large-area gas detection, it can use 10 ~ 12 m2 probe arrangement, and it can also achieve the effect of detecting
alarm.The installation method of combustible gas detectors can be installed with ceiling hanging, wall installation or pipe installation. It should ensure that they are firmly installed and reliable, and should also be considered for easy maintenance and calibration.
7.5 Settings of combustible gas alarm controller
When there is a fire control room, the combustible gas alarm controller can be set near the protection area; when there is no fire control room, the
gas alarm controller should be set in a place where personnel are on duty. The setting of the combustible gas alarm controller should comply with the installation and setting requirements of the fire alarm
controller.
8-1 Electrical fire monitoring system
8.1 Working principle of the electrical fire monitoring system
When an electrical fault occurs, the electrical fire monitoring detector converts the residual current, temperature, fault arc and other electrical fault parameter information in the protection line into an electrical signal. After data processing, the detector makes an alarm judgment and transmits the alarm information to the electrical fire
disaster monitor. After receiving the alarm information of the detector, the electrical fire monitor displays the location information of the electrical fault
alarm detector after the alarm confirmation and judgment, and records the alarm time of the detector alarm. At the same time, it drives the acoustic and optical alarm device installed in the protection area to issue an acoustic and optical alarm, and warns the personnel to take corresponding measures to eliminate electrical faults, eliminate electrical fire hazards, and prevent the occurrence of electrical fires.
8.2 Applicable locations for electrical fire monitoring systems
Electrical fire monitoring systems are suitable for electrical fault detection in important places with electrical fire hazards, especially substations, petroleum and petrochemicals, metallurgy, etc. that cannot interrupt power supply. An alarm signal is issued under the conditions of certain electrical fire hazards, and professionals are reminded to eliminate electrical fire hazards, realize early prevention of electrical fires, and avoid the occurrence of electrical fires.
8.3 System Settings
Setting Principles
Electrical fire monitoring system should be set according to the nature of the building and the electrical fire hazards, and should determine the form and installation location of the electrical fire monitoring detector based on the specific situation of laying
and electrical equipment in the electrical circuit. When there is no fire control room and the number of electrical fire monitoring detectors is not more than 8, an independent electrical fire monitoring detector can be used.
9-1 Reasons and conditions for setting up a fire control room
: The fire control room should be set up in the protection objects of the automatic fire alarm system with fire linkage function. The setting of the fire control room of
shall comply with the following provisions: The fire control room built separately in
shall not be lower than the second level. The fire control room attached to the building should be set up. The outer wall of the first floor of the building can also be set up on the underground floor of the building. However, partition walls with a fire resistance limit of no less than
2.00h and floor slabs with a duct with a temperature of no less than 1.50h should be separated from other parts, and a safe
exit directly to the outdoors should be set up.
Fire protection valves should be installed at the walls of the return air duct of the fire control room
. Electrical lines and pipelines that are not related to the fire control room should be strictly prohibited from passing through.
should not be set near equipment rooms where electromagnetic field interference is strong and other equipment rooms may affect the work of fire control equipment. Fire equipment set up in the fire control room should include fire alarm controller, fire linkage controller, fire control room diagram
shape display device, fire special telephone switchboard, fire emergency broadcast control device, fire emergency lighting and evacuation indication system control device, fire power monitor and other equipment, or combined equipment with corresponding functions
fire control room should be equipped with external telephones for fire alarms to facilitate timely alarm after confirming the fire alarm and obtain rescue from the fire troop.
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