The production of low voltage cables? What does a low voltage cable do

1. Check the "CCC" certification mark. Therefore, cable products are national compulsory safety certification products, all manufacturers must obtain the "CCC" certification certified by the China Electrical Products Certification Committee, obtain the "CCC" certification mark, and have the "CCC" certification mark on the certificate or product. 2. Look at the inspection report.

As a product that affects the safety of people and property, cables have always been listed as the focus of supervision and inspection, and regular manufacturers are subject to inspection by the supervision department on a regular basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department, otherwise, the quality of the cable product will lack basis. 3. Pay attention to packaging.

The packaging of wire and cable products is the same as other products, and all large and medium-sized regular enterprises that produce products that meet the requirements of national standards pay attention to product packaging. Pay attention when purchasing....

1. The so-called low-voltage wire is that the following cables (inclusive) are low-voltage cables, the difference is that the withstand voltage is different, the insulation and sheath structure are different; Yes.

control cables; Low-voltage power cables.

2. There are ,,,21 35kV above the low-voltage cable

High voltage power cables, as well as ultra-high voltage 100kV.

Explanation: The following cables (inclusive) are low-voltage cables.

Selection of low-voltage cables:

1.First of all, according to the transformer capacity and connection method, usually Y connection, according to the capacity of 630 and 400, the low-voltage output rated current is 909A and 577A;

2.It can be selected according to this current as a long-term working current;

3.It is also possible to use IG= iGT+k* IDT (see Chapter 7 of the Power Design Manual for details), i.e. according to the long-term load and the short-term load.

Introduction to low-voltage cable applications.

Low-voltage cables refer to power cables with a working voltage of less than 1kV. Low-voltage cables consist of a core, insulation, and a protective layer. They are used to connect the cables from the distribution cabinet to the device end.

Compared with high-voltage cables, low-voltage cables are more abundant in structure and use in technology. The range is also different, and they are all carriers of conductive energy, and the range of use is ubiquitous.

The main cause of cable failure.

When a cable fails, we first try to fix the fault and restore operation. In addition, cable faults are analyzed to analyze the specific causes. According to the data of Dingsheng Power's after-sales service department, the quality problem of the cable itself can be ruled out.

There are two main reasons why low-voltage cables fail. First, the external insulation is damaged due to external factors, and the grounding fault is caused by moisture. The second is that the joint is not properly handled, resulting in short circuit faults caused by moisture.

Low-voltage cable fault finding method.

When a cable fails, first use a multimeter.

or electronic megohmmeter through data analysis.

Current failure conditions. See which phase has a cable fault. After determining the fault phase, measure the resistance to ground with a multimeter. If the measured resistance is greater than 200 ohms, you can use the low-voltage cable fault finding method.

Low-voltage cable hand-opened fault finding method (step voltage method).

The step voltage method is applicable to all voltage levels of ground faults.

Faulty cables. It is a method of using the voltage between the pins around the ground current entry point to find cable faults. The specific wiring method is the red color of the power cable fault detector.

The hidden wanderer is connected to the fault phase of the cable under test, the black clip is grounded, and then the induction magnetic rod and step voltage sampler of the pin path are connected to the stove potato pin, and the power is turned on. After a short synchronization signal, the host emits an electromagnetic pulse.

Search along the road by means of a magnetic rod receiver. , you can accurately check the path of the cable, and then locate the fault of the cable along the path found. The specific method is to mark the left and right ends of the stepper voltage sampler with red and green respectively, and the indicator lights also correspond.

The indicator marker of the stepper voltage sampler is inserted into the soil. The red and green directions of the indicator light represent the direction of the cable fault point. In case of hard roads, the amount of watering can also be accurately measured.

The right side indicates that, and so on, the point of failure can be determined.