It mainly includes two categories: electrical equipment and electrical circuits. Electrical equipment includes power transformation and distribution facilities, various electrical equipment and electrical control devices.
Electrical lines include power supply and distribution lines, grounding devices and line protection devices and measures (such as pipe piercing measures).
The equipment has neat appearance, stable and reliable installation, and is convenient for disassembly, maintenance and adjustment.
According to the requirements of the drawings, all electrical equipment and components should be intact. If you want to replace it, you need to consult the relevant product catalogue to ensure that the main parameters are consistent or close.
2, component inspection:
Detection methods can be divided into visual inspection and instrument inspection. Test tools should include various electrical measuring instruments and special equipment for measuring the possibility of overheating or discharge.
All kinds of travel switches and buttons are flexible, accurate and reliable.
The dial glass of the electric appliance is intact, and the hands of the watch are flexible and accurate.
3, delimit the test items:
The detection items of different detection objects are defined based on the detection objects.
From a practical point of view, electrical safety accidents include not only fire safety, but also limited detection items, rather than an all-encompassing and unspecific general specification.
The detection items of electrical fire safety detection should only be related to fire safety.
Such as electrical overheating, heat accumulation, discharge, insulation or grounding fault and lack of protective measures, etc., should be important contents of the test project.
Extended data:
Cause of fire:
Electrical fires are caused by electric energy. The direct causes are mainly leakage, short circuit, overload, poor contact, overload, arc, electric spark and so on. , produce high temperature and heat, ignite the surrounding combustible substances, thus causing a fire.
1. Leakage: the insulation ability of the conductor or its supporting materials is poor, so that a small amount of current passes between the conductors or between the conductor and the earth, and the electric spark of leakage can become a fire source;
2. Short circuit: In the circuit, due to various reasons, two points with different potentials meet or collide, resulting in a sudden increase in current. Due to the large current in the short-circuit circuit, it is easy to produce strong electric sparks and arcs at the short-circuit point, and the metal conductor of the wire appears traces of melting and erosion defects. This strong short-circuit arc and molten high-temperature metal will cause the combustion of combustible materials.
3. Overload: The current passing through the guide wire exceeds the safe current value. Because the wire itself has resistance, it will heat up when it is electrified. The greater the current, the greater the heat, and the higher the insulation temperature of the wire. Once the temperature of the insulated conductor exceeds the maximum allowable working temperature, the insulation layer of the conductor will accelerate aging and even burn, causing fire accidents;
4. Excessive contact resistance: At the connection of the power cord and the connection of the power cord with switches, protective devices and large electrical equipment, due to poor contact, the local resistance of the contact part is too large;
5, electric spark and arc. Spark is the result of discharge between electrodes, and arc is composed of a large number of dense sparks. The temperature of electric arc can be as high as 3000qC or above, and electric spark and electric arc can easily cause combustible substances to burn or explode, thus causing fire.
References:
Baidu encyclopedia-electrical fire safety detection