1. Poor construction quality
The public lighting failures caused by construction quality account for a large proportion. The main manifestations are as follows: first, the depth of cable trench is not enough and the paving of sand cover bricks is not carried out according to the standard; Second, the manufacture and installation of corridor tubes do not meet the requirements, and the ends are not made into mouthwash according to the standard. Third, when laying cables, they are dragged on the ground. Fourth, the embedded pipes of the foundation are not constructed according to the standard requirements. The main reason is that the embedded pipes are too thin and have a certain degree of bending, which makes it quite difficult to pass through the cables, resulting in “dead bending” at the bottom of the foundation. Fifth, the thickness of crimping and insulation wrapping is not enough, which will cause interphase short circuit after long-term operation.
2. The materials do not pass the test
Judging from the faults handled in recent years, the low quality of public lighting materials is also a big factor. The main manifestations are: the wires contain less aluminum, the wires are relatively hard, and the insulation layer is thin. This kind of situation is more common in recent years.
3. The quality of supporting projects is not too hard
Cables for public lighting are usually laid on sidewalks. The poor construction quality of sidewalks and the subsidence of the ground make the cables deformed, resulting in cable armoring. In particular, the northeast region is located in a high and cold region. When winter comes, the cable and soil will form a whole. Once the ground subsides, it will be strained at the bottom of the public lighting foundation, and when there is much rain in summer, it will burn off at the foundation root.
4. unreasonable design
On the one hand, it is overload operation. With the continuous development of urban construction, public lighting is also continuously extended. When new public lighting is built, it is often connected to the circuit which is close to the light. In addition, the advertising industry has developed rapidly in recent years, and the advertising load is correspondingly connected to public lighting. As a result, the public lighting load is too large, the cable is overheated, the insulation is reduced, and a short circuit to ground occurs. On the other hand, when designing the light pole, only the light pole’s own situation is considered, ignoring the space of the cable head. After the cable head is wrapped, most of the doors cannot be closed. Sometimes the cable length is not enough, and the joint fabrication does not meet the requirements, which is also the cause of the failure.
Post time: Apr-17-2020