What are the main points of purchasing wires and cables? Let's take a look. As the main carrier of power transmission, wire and cable are widely used in electrical equipment, lighting circuits, household appliances, etc. Its quality directly affects the quality of the project and the safety of consumers' lives and property. There are many wire varieties on the market, and appropriate wires should be used according to their own power load.
What are the precautions for wires and cables? Let's take a look. Common cable faults: wire surface markings-according to national standards, the wire surface should have continuous markings of the manufacturer's name, product model and rated voltage. This helps to find the manufacturing plant in time when there is a problem during the use of the wire, and consumers should pay attention to this when buying the wire.
There are many kinds of wire and cable products for electrical equipment on the market, which are difficult for ordinary consumers to distinguish. So what are the main categories of wire and cable products? What are the product naming principles of wire and cable? The editor brings you a brief understanding of relevant content knowledge.
The wires and cables for electrical equipment are mainly used for internal or external connection of electrical equipment, low-voltage transmission lines and various electrical signal transmission lines. Generally speaking, except for power cables, communication cables and magnet wires, most insulated wires and cables are classified as wires and cables for electrical equipment.
Electrical equipment with wire and cable is a large class of wire and cable products, a wide range of applications, many varieties, many series, large output, process type complex. The rated voltage of wires and cables for electrical equipment is low, and the working voltage is 450/750v and below, which is not more than 0.6/1kv. The working voltage of signal and instrument cables is usually 300/500v and below. The ampacity of the cable is determined according to the requirements of the cable.
Low voltage power cable winter pay attention to matters? As the weather gets colder and colder, manufacturers of low-voltage power cables usually become more difficult, which brings inconvenience to construction. Here are some precautions for winter construction. Let us take a brief look.
If the thin part of the low-voltage power cable sheath does not meet the requirements, the cable sheath will be damaged before reaching the normal external destructive force. Because the magnesium oxide crystal powder used as an insulator in the low-voltage power cable is a kind of high moisture absorption rate Material, once the outer sheath is slightly damaged during cable transportation and laying, the magnesium oxide crystal powder will be affected by moisture and the resistance will be greatly reduced. In addition, when making the middle end joint of the cable, the cable should be cut off, which will also cause the magnesium oxide crystal powder to be damp.
Let's talk about some knowledge of low-voltage power cables and the advantages of power cables. Low-voltage power cable is the transmission carrier of power transmission. Now many people don't know much about the maintenance knowledge of this product in daily use. I hope you can learn how to maintain low-voltage power cables after reading this article.
Wire and cable manufacturers: burial requirements 1. When power cables are crossed, the high-voltage cables should be located under the low-voltage cables. If one of the cables is protected by pipes or separated by partitions within 1 meter before and after the crossing, the allowable distance is 0.15 meters.. 2. In the case of thermal insulation measures, the cable is close to or crosses the thermal pipeline, and the parallel and cross distances are 0.5m and 0.15m respectively.
Overhead insulated cables relate to the field of electrical technology, in particular to overhead line insulation devices. This type of overhead line is used to transmit power in the high voltage range in the power grid, and each rope conductor is usually supported by a holding insulator and fixed on a conductor tower. In order to protect the power of the overhead line, in this case, the overvoltage generated by the line lightning rod, such as the overvoltage caused by lightning, is exported to the ground potential. So, let's learn about the manufacturing method of overhead lines!