Industry News-Yunnan Qianlie Cable Co., Ltd.

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The causes of winter wire and cable damage and preventive measures

Winter cold, many construction workers in the laying and installation of wire and cable will find that the usual good quality wire and cable products, often appear some line body hardening, insulation sheathing damage and other phenomena, many construction workers think that the wire and cable products themselves have quality problems, and cable manufacturers also insist that the product has been inspected at the factory, is a qualified product, often leading to misunderstandings between the two sides.

2022-09-29

The difference between USE-2 wire and PV wire

USE-2 wire has long been the interconnection wire used in solar modules, while PV wire was first mentioned in the 2008 edition of the National Electrical Code. While both have similar construction and performance requirements, there are always differences due to their unique installation conditions. The following is a comparison of the two in terms of application, construction and testing requirements.

2022-09-29

Practical wire and cable square number calculation method and how to determine whether the cable is up to standard.

A few squares is a nominal value specified in the national standard, a few squares is the user to choose the wire and cable according to the load of the wire and cable. Wire square number is a verbal term in the renovation of plumbing construction, often said a few square wire is not added to the unit, that is, square millimeters.

2022-09-29

Wire and cable quality and safety "joint investigation and joint fight," the special action to carry out

In recent years, the national market supervision system to continue to carry out special rectification of wire and cable production enterprises, industry order increasingly standardized, the quality level has steadily improved, but there are still unqualified circulation problems, conductor resistance and other important indicators do not meet the standard requirements, jerry-built production of "discount" cables occur from time to time. To further promote the sustainable and healthy development of the wire and cable industry

2022-09-29

Wire and cable products are mainly divided into five categories

The main characteristics of these products are: pure conductor metal, no insulation and sheathing, such as steel-core aluminum stranded wire, copper and aluminum busbar, electric locomotive wire, etc.. Processing technology is mainly pressure processing, such as melting, rolling, stretching, twisting/compression twisting, etc. The products are mainly used in suburban areas, rural areas, customer main lines, switchgear, etc.

2022-09-29

The main tasks of daily cable maintenance

By monitoring the load of the cable, we can understand the change of the load of the cable, control the overload of the cable in principle and analyze the operation status of the cable. Since overload is very harmful to the cable, the load of the cable needs to be measured and monitored frequently. The load of the cable can be measured with a clamp-on ammeter, and the cable should be kept running at the specified permissible continuous current-carrying capacity.

2022-09-29

How long is the cable life?

The typical life span of a cable is 20 years. Some people may say that life exceeds 20 years or even longer. Yes, it is true that there are cables that have a life of more than 20 years. From a safety point of view, the design life is the longer life of the cable.

2022-09-29

How to ground high voltage cables?

High-voltage three-core cable grounding: voltage levels of 35kV and below are grounded at both ends of the cable. This is because most of these cables are three-core cables. In normal operation, the total current flowing through the three cores is zero, there is basically no magnetic chain outside the aluminum cladding or metal shield, and there is basically no induced voltage at both ends of the aluminum cladding and metal shield, so the induced current will not flow through the aluminum cladding or metal shield after grounding at both ends.

2022-09-29

How to choose the cable?

Wires and circuits are hidden projects, and even small hidden problems can cause serious safety accidents. Therefore, before laying the wiring, we should be well prepared. For example, when choosing wires and cables, we need to determine the right cables based on various considerations. There are so many types of wire and cable, how do we choose them?

2022-09-29

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