A junction cable box is a small-sized device that is designed to connect and branch armored and rubber cables on power or control circuits. This element is most often used in coal mines and on the surface as an element for connecting power cables. What are these mechanisms, and how complex are their designs? Find out the answers to these questions in our article today.
Device
The junction box consists of a high-strength flameproof enclosure and panel. Moreover, its first part includes two mechanisms - the case and the cover. All the parts that make up the junction box for lighting networks are very reliable and durable. Inside the housing is a special panel. On it there are about 9 pads with different markings (KP.1, KP.2.1, KP.3 and so on). These devices are necessary for reliable contact with the power cable, and more precisely with its cores. In addition, the device has several special terminals for connecting them.
It is worth emphasizing that the design of the box also includes external and internal grounding clamps. They are necessary for grounding the armor, sheath, and wire used in the device. The cable entries in their form have fuses - brackets that protect the contacts from possible pulling out and other mechanical damage. It is impossible not to note the presence of sealing elements in this box. Its design uses a special o-ring, which is compressed by means of a nut or coupling. Depending on the specific type of terminals and inputs used, there are several dozens of varieties of these devices.
Technical features
The junction box, due to its robust and sturdy construction, can be used and makes contact in almost extreme conditions. The permissible temperature within which this box can maintain its conductor properties is from -50 to +79 degrees Celsius. At the same time, the level of atmospheric pressure can vary between 630-850 mm Hg. Art. In addition, the junction box is used at 95 percent air humidity and withstands all aggressive effects of impurities contained in the ambient air.
Material
This unit is made of two types of materials. This can be an alloy of the D16T series or ordinary sheet steel. Accordingly, depending on the material used, the junction box can be divided into milled and stamped.
How much does she serve?
The maximum service life of this device, approved by the manufacturer, can be about 10-12 years. In this case, the calculation is carried out under the condition of a constant supply of electric current with a voltage of 220 volts and a current strength of 10 Amps. Thus, the junction box is one of the most durable devices that are used in this field.