The power requirements of double girder bridge cranes use cables. If the cable is used too much, the cost will be wasted. If the cable is burned, it may even cause a safety accident. So how to choose the right cable? The following is a brief introduction:
The cable size of the double-beam bridge crane is determined by the current, which is related to the voltage and total power of the double-beam bridge crane. For example, the main power of a 5-ton double-beam bridge crane is generated by two crane motors, a trolley motor, and a lifting motor. The total power of the double beam bridge crane can be calculated as 9.9kw. The voltage used is 380V, so the current of the cable can be calculated as 26 amperes according to the formula: power = voltage * current. The current that a square copper core cable can pass is about 7 amperes, so 4 square cables meet 26 amperes. This shows that we need to understand the power, voltage, current-carrying capacity of the cable and the speed of the double-motor double-beam bridge crane.
In addition, the selection of cables should consider the major brands in the market. Some small factories cut corners in the production of cables, which shows that there is no 4 square meters of cables in 4 square meters. The copper core of the qualified copper wire should be purple-red, shiny and soft. However, the counterfeit and inferior copper core wire is purple-black, light yellow or white, with many impurities, poor mechanical strength, poor resistance, and the wire will break with a little force, and the wire often breaks. When viewing, just peel off 2 cm from one end of the wire, and then rub a piece of white paper on the copper core. If there are black substances on the white paper, it means that there are more impurities in the copper core. In addition, the insulation layer of counterfeit and shoddy wires seems to be very thick. In fact, most of them are made of recyclable plastic. Over time, the insulating layer will age and leak electricity.
The improper selection of the power supply cable for the double-beam bridge crane caused a safety accident. Although the cable is small, the responsibility is heavy. Many fires are caused by aging wires, improper equipment, or poor wire quality. Therefore, the user must be clear-eyed when selecting, carefully identify, and take precautions.
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