Mining low-voltage cable junction box BHD2-25 660/380V explosion-proof three-way and four-way

Description :

  BHD2-25/(660/380) -2G/3G/4G mining low-voltage cable junction box is an electrical connection equipment designed specifically for hazardous environments underground and on the ground in coal mines. It is mainly used for power cable branching, extension, and conversion at 660V or 380V voltage levels. This low-voltage cable junction box for mining solves the safety pain points of cable joints being prone to short circuits and sparks causing explosions in damp, dusty, and gas environments underground. It is suitable for connecting power lines of equipment such as coal mining machines, conveyors, and lighting signals, ensuring the continuity and safety of power transmission.

  The shell of the low-voltage cable junction box for this mine is made of high-strength cast iron or steel plate welded structure, and the surface has been treated with anti-corrosion, possessing good mechanical strength and impact resistance. The core insulation components are made of high-quality engineering plastics or ceramic materials, with a withstand voltage level that meets the 660V/380V standard. The wiring terminal layout is reasonable and supports multiple wiring methods such as 2-way, 3-way, and 4-way. The product strictly complies with industry standards such as MT429-1995 "Low Voltage Cable Junction Box for Coal Mines", and has ExdI Mb explosion-proof rating. The inner diameter of the sealing ring is compatible with the outer diameter of common mining cables, ensuring protection level of IP54 or above under harsh working conditions, effectively preventing dust and water from entering.

  When selecting, it is necessary to choose the 2G (two-way), 3G (three-way), or 4G (four-way) specifications of the BHD2-25 series according to the actual number of circuit branches, and confirm that the outer diameter of the cable matches the diameter of the junction box introduction device. Unlike high-voltage junction boxes, this mining low-voltage cable junction box is only suitable for AC circuits with a rated voltage below 1140V and is strictly prohibited from being used under overvoltage. If there is a strong corrosive gas present on site, it is recommended to use the stainless steel material version. The purchaser should pay attention to distinguishing between straight through and branch structures, ensuring that the wiring cavity space meets the cable bending radius requirements, and avoiding insulation layer damage due to insufficient installation space.

  When installing the low-voltage cable junction box for mining, it is necessary to cut off the upper power supply and verify the electricity to ensure that the grounding bolt is reliably connected to the underground grounding grid, and the grounding resistance is not greater than 2 ohms. In daily maintenance, it is necessary to regularly check whether the shell fasteners are loose, whether the sealing ring is aged and hardened, and whether the wiring terminals have overheating and oxidation phenomena. If cracks or seal failure are found in the box, it should be replaced immediately, and it is strictly prohibited to open the lid with electricity. The typical usage cycle depends on the severity of the environment. It is generally recommended to conduct an unboxing inspection every six months, clean the dust inside the chamber, and tighten the wiring screws to ensure long-term stable operation.

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