Wiring duct,Cable Gland,Cable Tie,Terminals,RCCN

First, the joints easily cause accidents

There are always many connection points on the electrical wiring such as wires and wires, wires and switches, wires and appliances, wiring ends, wires and shelter junctions, etc. These joints are different from the rest of the wire in Joints, the insulation layer is stripped, if the package wrapped poor and produce two lines collide, it may constitute a short circuit, fever or spark

Second, easy to contact resistance is too large and fever

If the contact area is smaller than the cross-sectional area of the conductor, then according to the fact that the resistance and the conductive area are inversely proportional to each other, the smaller the contact area of the connection point is, the larger the resistance is; the larger the resistance is, The more likely to cause fever, the joints at the conductor than the other parts of the total prone to fever If the joint quality is good, the heat generated is not large, the heat is good, the heat quickly shed, the junction temperature does not rise too high and cause the accident , Then the possibility of accidents caused by a large wire with a hook-shaped connection, then the wire contact area up to the equivalent wire cross-sectional area of 1/8, so the junction resistance is 8 times that of other places, fever is also similar to 8 times, This site is prone to accidents, hook-shaped joints, vibrating outside the phenomenon, it will show intermittent situation, it may show sparks, it is likely to cause the surrounding combustible burning because of the joint Contact resistance is too large, but also may produce high temperatures, can make the metal conductor discoloration and melting, causing the conductor insulation and other materials on fire, into a fire accident.

Third, poor quality of placement

(2) Wires and switches, electrical wiring through the column connection, due to the construction of the horsepower, studs without washers, gong caps are not tightened, which will increase the contact resistance, such as a hotel, distribution box For this reason, the conductor melts, the melt falls on the cardboard box below, causing a fire

(3) The copper wire and the aluminum wire are not connected according to the rules and regulations, and often have the same bed dreams, the contact resistance is also relatively large, causing a hidden danger

(4) Multi-strand wire core is not twisted, some wool (core) outside the Alice, the short circuit after each other, for example, a department store in the power outlet, did not stranded copper stranded wire, the results Some copper wire exposed to exposure to another phase line, resulting in a short circuit after power, causing a fire

(5) During construction, the joints of each phase line are not staggered and may also cause an accident on the uniform section. For example, a ginning plant stacks with a mobile crane. Illegal use of the electric wire truck with the connector When the truck is unloaded, the wire connector is pulled off the connector Short circuit between phases, resulting in sparks, causing jute incineration, causing a serious accident

Fourth, long-term open connector loose

Some joints in the placement of the quality is better, but because of thermal expansion and contraction of the reason, or long-term vibration, will make loose joints such as a bridge bridge electrical circuit, because the vehicle often violent vibration occurs when crossing the bridge, So that the wire joints slowly loose contact resistance slowly becomes larger and more serious fever, leading to a fire

Fifth, the conductor junction oxidation

In humid and air-corrupted ecosystems, an oxide layer is easily formed on the conductor (copper oxide is shown on the copper wire and aluminum oxide is more likely to be formed on the aluminum wire). The conductivity of such oxides is very poor, Plant electroplating workshop, the long-term acid corrosion of air conductors, the conductor constitutes an oxide layer in the appearance, leading to increased contact resistance, high temperature after power has occurred, severe red and even wire thanks to real-time performance, and then did not become an accident

Six, dust pollution