The role of cable branching boxes in power systems.

Release time:

2021-09-03

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Abstract

With the booming development of the real estate industry, the transformation of the State Grid is changing rapidly, and the role of cable branch boxes is becoming increasingly important. There are more and more manufacturers of cable branch boxes in the market, and for many businesses looking to purchase wired branch boxes, how to choose has become a headache. Today, I will tell you what to pay attention to when purchasing cable branch boxes.

With the booming development of the real estate industry, the transformation of the State Grid is changing rapidly, and the role of cable branch boxes is becoming increasingly important. There are more and more manufacturers of cable branch boxes in the market.Cable branch boxFor many businesses looking to purchase wired branch boxes, how to choose has become a headache. Today, I will tell you what to pay attention to when purchasing cable branch boxes.

The grounding loop of the cable branch box requires that the maximum short-time withstand current it can bear is about 87% of the rated short-time withstand current of the main circuit, to ensure the safe use of the cable branch box. There should be a clear and obvious main wiring diagram on the outside of the operation room door of the cable branch box for warning and use.

Generally, cable branch boxes should be equipped with a base plate and fireproof sealing material. After the cable installation is completed, the gaps in the base plate should be sealed with fireproof sealing material to prevent moisture from rising from the cable trench into the cable branch box. The procurement uses ethylene propylene diene monomer (EPDM) rubber as the main material for sealing cable joints in cable branch boxes: this material is hard, brittle, has poor sealing performance, interface separation, and allows impurities and dirt from the air to enter the internal interface, causing leakage breakdowns, pollution flashovers, and other hazards. Moreover, EPDM rubber is a flammable material that can easily cause leakage or electric arc flashes and is prone to burning. Once the sealing component is damaged, it can easily lead to accidents. Additionally, its moisture-proof, waterproof, and aging resistance performance is also relatively weak, failing to meet long-term operation and maintenance-free requirements. Regardless of whether they are direct sellers or agents, there is a certain price difference between agents and direct sellers. Customers purchasing cable branch boxes will definitely want higher quality products. Therefore, it is necessary to carefully test when purchasing; if the manufacturer's quality is not up to standard, one can first consult old customers or look at their evaluations and usage situations to see if this product's quality is good.

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