Introduction:
Made of strength ABS and PC material, the enclosure has beautiful appearance, high plasticity and doqgedness. LWHA series distribution box is suitable for terminal boxes. distribution panels instrument boxes, electrical equipment boxes and control boxes. Moreover, it is simple and easy to use.
I. Causes of mcb waterproof distribution board fire mainly include the following four aspects:
1, leakage fire: The so-called leakage is a place of the line because of some reason (natural reasons or artificial reasons, such as wind and rain, humidity, high temperature, pressure, scratch, friction, corrosion, etc.) so that the insulation of the wire or the insulation ability of the support material decline, Lead to a part of the electric current between the wire and wire (through damaged insulation, support, etc.), between the wire and the earth (wire through the cement wall of the steel bar, tinplate, etc.), this phenomenon is electricity leakage. When the leakage occurs, the leakage current flows into the earth on the way, such as in the case of large resistance parts, will produce local high temperature, resulting in combustibles near the fire, resulting in a fire. In addition, leakage sparks at leakage points can also cause fires.
2, short circuit fire: after the insulation of bare wire or insulated wire in the electrical line is damaged, live wire and adjacent line, or live wire and ground wire (including ground belonging to the earth) touch together at a certain point, causing a sudden increase in current phenomenon is called short circuit, commonly known as touch wire, mixed wire or connected. Because suddenly reduce the resistance when short circuit, current increases suddenly, the instantaneous heat is big, considerably more than the normal operating line of heat, and in the sparks of short-circuit point is easy to produce strong and arc, not only can make the rapid burning insulation, and can make the metal melting, cause near flammable fuel combustion, causing a fire.
3, mcb waterproof distribution board overload fire: the so-called overload refers to when the current through the wire exceeds the safe load, the temperature of the wire is rising, this phenomenon is called overload. When the wire is overloaded, the aging and deterioration of the insulation layer of the wire is accelerated. When the heavy load, the temperature of the wire will continue to rise, and even cause the insulation of the wire combustion, and can ignite the combustible material near the wire, resulting in a fire.
4, contact resistance is too large fire: it is well known that all wires and wires, wires and switches, fuses, instruments, electrical equipment and other places are connected to the joint, the resistance formed on the contact surface of the joint is called contact resistance. It is normal for the joint to heat up when an electric current passes through it. If the joint is well treated and the contact resistance is small, the heat at the joint point is minimal and the normal temperature can be maintained. If there are impurities in the joint, the connection is not secure or other reasons to make the joint contact is poor, resulting in excessive local resistance of the contact part, when the current through the joint, a lot of heat will be generated here, forming a high temperature, this phenomenon is too much contact resistance.
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