What are the precautions that need to be taken when designing an electrical fire monitoring system?

1. The electrical fire monitoring system should be listed in the department or all monitoring device groups

1. Electrical fire monitoring equipment;

2. Residual current type electrical fire monitoring detector;

3. Temperature measuring electrical fire monitoring detector;

4 Linear Temperature Fire Detector.

2. Independent detectors or non-independent detectors should be used to detect electrical fire parts according to the scale of the project.

3. The form and installation location of the electrical fire monitoring detector should be determined according to the specific situation of the electrical laying electrical equipment.

Fourth, the number of fire control room and electrical fire monitoring detectors is more than 8 independent electrical.

Fire monitoring detectors.

6. The setting of the electrical fire monitoring system should affect the work of the power supply system.

Resources.

1. Code for Fire Protection Design of Buildings GB50016-2014: Article 1 stipulates automatic fire alarm system: This article is mandatory.

The automatic fire alarm system can play a role in early detection and notification of fire alarm information, timely notification of personnel for evacuation and fire extinguishing, and is widely used.

2. Article 9 of the Code for the Design of Automatic Fire Alarm System GB50116-2013 on the design of electrical fire monitoring system.

3. Article 50054-2011 of the "Code for Design of Low-voltage Power Distribution" stipulates that when the building power distribution system meets the following conditions, it is advisable to set up residual current monitoring or protection electrical appliances, which should act on the signal or cut off the power supply.

4. Article 16-2008 of the Code for Electrical Design of Civil Buildings stipulates that in order to prevent electrical fires, the following provisions shall be met when the distribution lines of the following civil buildings are set up with a fire residual current action alarm system.

5. Article 48-2014 of the Code for the Design of Store Buildings stipulates that for the business halls of large and medium-sized store buildings, in addition to fire-fighting equipment and emergency lighting, the power distribution trunk circuit shall be equipped with a fireproof residual current action alarm system. (Strong Bar).

6. The Code for Electrical Design of Financial Buildings JGJ 284-2012 stipulates: Electrical fire monitoring detectors shall be set up in the following parts of special and first-class fireproof financial buildings.

7. GB50045-95 (2005 Edition) "Code for Fire Protection Design of High-rise Civil Buildings", which stipulates in the article that a leakage fire alarm system should be set up in places with high fire danger and dense personnel in high-rise buildings.

The basic principle of the electrical fire monitoring system is that when the current, temperature and other parameters in the electrical equipment are abnormal or abrupt, the terminal probe head (such as residual current transformer, temperature sensor, etc.) uses the principle of electromagnetic field induction and the change of temperature effect to collect the information, and transmit it to the monitoring detector, and analyzes and judges the amplitude of the change through amplification, AD conversion and CPU, and compares it with the alarm set value.

Once the set value is exceeded, the alarm signal is issued, and it is also transmitted to the monitoring equipment, and then further identified and judged by the monitoring equipment, when it is confirmed that a fire may occur, the monitoring host sends out a fire alarm signal, lights up the alarm indicator light, sends out an alarm sound, and displays fire alarm and other information on the LCD screen at the same time. According to the information displayed above, the personnel on duty will quickly go to the accident site for inspection and processing, and send the alarm information to the centralized console.

Answer] Reputation digging: Wisdom Cover A

The protection object is 1000V and below before the power distribution line, and the temperature measurement electrical fire monitoring detector should be set up in contact. The protection object is the power supply line above 1000V, and the temperature measurement electrical fire monitoring detector should choose the grating optical fiber temperature measurement type or infrared temperature measurement type electrical fire monitoring detector.

In the electrical fire monitoring and detection system, the remaining current is exhausted.

Electrical fire monitoring detectors should not be installed in IT systems.

of the distribution lines. Low-voltage stove and power distribution system.

There are three types of grounding, namely IT, TT, TN.

The first letter indicates the relationship between the power supply end and the ground:

i-All live parts of the power supply side are not grounded or have a little passing impedance.

Earthing; The T-power side is a little bit directly grounded.

The second letter ridge hole indicates the relationship between the exposed conductive part of the electrical installation and the ground:

The exposed conductive part of the t-electrical installation is directly grounded, and this grounding point is electrically independent of the grounding point at the power supply end;

The exposed conductive portion of the n-electrical unit has a direct electrical connection to the power termination point.

<> obviously, it is not possible to set up residual current electrical fire detectors in IT systems. Residual current electrical fire detectors, i.e. when the phase of the line to be protected.

An electrical fire monitoring detector that generates a residual current that is similar to a sinusoidal waveform and its RMS value changes slowly, either directly or through an unexpected load to the ground, and automatically alarms when the current is greater than a predetermined value. The residual current electrical fire monitoring detector should be set at the head of the low-voltage distribution system as the basic principle, and should be set at the appearance end of the first-level distribution cabinet (box). When the leakage current of the power supply line is 500mA, it should be set on the next level of distribution cabinet (box).

1. An electrical fire monitoring system should be set up according to the nature of the building, the risk of electrical fire, and the level of protection objects.

2. The electrical fire monitoring system shall be composed of some or all of the following monitoring devices:

1. Electrical fire monitoring equipment;

2. Residual current type electrical fire monitoring detector;

3. Temperature measuring electrical fire monitoring detector;

4. Linear temperature sensing fire detectors.

3. According to the scale of the project and the need to detect the electrical fire site, it is determined to use independent detectors or non-independent detection.

Utensil. Fourth, according to the specific situation of electrical laying and electrical equipment, the form and installation location of electrical fire monitoring detectors should be determined.

5. When there is no fire control room and the number of electrical fire monitoring detectors does not exceed 8, independent electrical can be used.

Fire monitoring detectors.

6. The setting of the electrical fire monitoring system should not affect the normal operation of the power supply system.

The regulations and norms on which it is based are:

National standard GB13955-2005 "Installation and Operation of Electrical Fire Monitoring Action Protection Devices".

National standard "Installation and operation of residual current action protection device" GB13955 Part 6.

GB50045-2005 "Code for Fire Protection Design of High-rise Civil Buildings".

GB14287-2005 Electrical Fire Monitoring System.

National standard GB13955-2005 "Installation and Operation of Electrical Fire Monitoring Action Protection Devices".

The national standard "Installation and Operation of Residual Current Action Protection Device" GB13955 Part 6 GB50045-2005 "Code for Fire Protection Design of High-rise Civil Buildings" requires GB14287-2005 electrical fire monitoring system.

Electrical fires can also be monitored from smoke concentrations, and the cable is overheated for a long time before the fire hazard, and at this time, the rubber layer of the cable will produce pyrolytic particles, which can actually be detected by products such as aspirating smoke fire detectors.

Hope it helps.

Ask if it is a non-fire line or a fire line?

Question: Do I remember testing the non-fire lines of some buildings?

Like a care facility for the elderly.

Question: What about above-ground buildings?

The basic concept of the electrical fire monitoring system is that when the main parameters such as current and temperature in the electrical equipment are abnormal or sudden, the terminal camera (such as voltage transformer, temperature sensor, etc.) Choosing the basic principles of magnetic field sensing and the variation of temperature utility. The information content is collected and sent to the detection detector.

After amplification and AD conversion, the CPU analysis distinguishes the conversion intensity and compares it to the alarm preset. When the preset value is exceeded, an alarm signal is issued. In addition, it is transmitted to the monitoring device, which is then further identified and resolved.

When it is determined that a fire may occur, the monitoring host sends a fire data signal, lights up the alarm display light, sends an alarm sound, and displays the information fire on the LCD screen. Alerts and other informational content. Based on the information content of the information displayed above, the staff quickly went to the scene of the traffic accident to inspect and manage the alarm information resources to a centralized control panel.

Question: It doesn't say whether it's a fire or non-fire line.