Compared with ordinary cables, bus clusters show strong advantages as main power supply lines, but over time, operating practice has shown that bus clusters.

The cluster itself has many irreparable defects, so the bus cluster as the main power supply line is not the most ideal power supply product.

First, the price is high, the installation area is large, the installation cycle is long, and the labour intensity is large, so the one-time investment is large.

Recognised trunking is more expensive, such as a set of three-phase four-wire system, 3m high, trunking current 100A, plug-in with branch connection.

Bus ducts, due to the special laying environment and installation requirements of bus ducts, the building should be individually reserved for electricity.

For high-rise buildings, the electrical shaft from top to bottom occupies a considerable area, increasing the civil construction.

Investment; busbar installation in sections, each section of nearly 100 kg, installed in place by manual movement adjustment, labour intensity.

Can be imagined; due to different floors and current levels, busway interchangeability is often poor. If the joints are not flat and smooth, tighten the joints.

The space for connecting bolts is too small, and the installation is even more time-consuming and labour-intensive; in addition, the installation requirements of bus ducts are strict, and collisions should be avoided during installation.

The collision, knocking and tightening of the connecting bolts should be appropriate, and over-tightening and over-loosening will cause hidden problems and affect the service life of the busway, so it is necessary.

There are experienced and skilled workers to complete.

Secondly, it is mostly handmade, the product quality is not controlled and guaranteed, there are too many joints and fault points.

So its power supply reliability is poor. There are many domestic bus duct manufacturers, mostly in the southern provinces and cities, especially in Yangzhong City, Jiangsu Province.

It is the home of bridges and bus ducts. But among the many manufacturers, can really do scientific management, high quality bus duct production, not many, but the vast majority.

Most of them are shoddy. Bus duct manufacturing process is backward, almost all manual operation. There are many human factors, and the quality cannot be effectively controlled.

System. When the construction unit orders the bus duct, it should do a good job of the bus duct manufacturer's production scale, technical force, worker quality and production environment.

Thorough investigation, especially the production environment. Because if the insulation treatment is carried out in an unclean space, how many in the insulation layer?

There will be some conductive particles, which doesn't matter at the beginning of operation, but will cause insulation damage over time. Other manufacturers are selling new products.

The signboard of ‘five-core busbar’ misleads users. The so-called ‘five-core busbar’ is a PE cable installed in the housing, which is not only costly, but also inconvenient to use and not allowed by the code.

Inconvenient to use, the code does not allow. Because the PE line must have absolutely reliable grounding continuity, do not allow too many joints.

The PE lines of the core busbar must be connected one by one. If only one connector is disconnected, the PE line may be charged so that it is outside the equipment to which it is connected.

The enclosure may also be charged, and its danger can be imagined.

Thirdly, the moisture resistance and corrosion resistance are poor, the laying environment and installation requirements are high, and the maintenance workload is large. Bus ducts are in operation.

During transport and storage, the insulation layer will be damp and deteriorate, and the copper row will be oxidised and corroded, especially at the connector.

The electrical performance decreases, and the busway must be maintained before installation; the busway runs hot and cold, and the insulation layer is hot and cold.

Cooling moisture will come out and absorb, reducing the quality of insulation; joints will be loose and oxidised when hot and cold, increasing the contact resistance.

, joints hot. These facts are sufficient to show that the busway must be maintained frequently. Long-term use of bus ducts at least once a year maintenance checks.

. Before maintenance, use a multimeter to measure the conductive strips of the busway to confirm that the busway is not electrified. Mainly check the following.

(1) Check all fasteners and conductive parts for loose contact.

(2) Check whether the insulating material is aging and deteriorating, and whether the conductive parts are melting and deteriorating; and

(3) Check whether there is foreign matter entering the bus duct and whether there is water seepage.

Problems found should be dealt with in a timely manner without leaving any hidden dangers. If insulation breakdown is found, the bus duct should be dismantled in sections or tested for voltage withstand.

The instrument is inspected in sections to find out the point of failure and replace the busway with a new one, or rewrap it.

Fourth, the contact parts or joint parts of the busway are prone to heat in use, or insufficient consideration of the selected busway's current-carrying capacity will lead to busway heat.

Low valley heat. Therefore, when selecting the capacity of the busbar in the specific engineering design, the actual electrical load of the building should be fully calculated and the number of weeks should be considered.

The influence of the ambient temperature, but also leave a margin.

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