Common faults of wires and cables for electrical equipment
Wire and cable for electrical equipmentAccording to the national standard, the surface of the wire must be continuously marked with the name of the manufacturing plant, the product model and the rated voltage. This helps to find the manufacturing plant in time when there is a problem during the use of the wire. Consumers must pay attention to this when buying the wire. At the same time, when purchasing wires, consumers should pay attention to whether the name of the manufacturing plant, product model, rated voltage and the printed marks on the surface of the wires displayed on the certificate are consistent to prevent counterfeit products.
Wire appearance-When consumers buy wires, please pay attention to the smooth and flat appearance of the wires, the insulation and covering layers are not damaged, the signs are clear, and the hand model wires are not greasy. From the cross-section of the wire, the thickness of the insulation or sheath on the entire circumference of the wire should be uniform, not biased towards the core, and the insulation or sheath should have a certain thickness.
When consumers buy wires, they should pay attention to whether the Daoshan Sutra is consistent with the cross-section specified in the certificate. If the cross-section of the conductor is small, the heating of the wire is easy to short-circuit. It is recommended to use wires for household lighting lines with specifications above 1.5 mm². Air conditioners, microwave ovens and other large power appliances should use more than 2.5 mm² specifications of the wire.
Specification Use-To standardize wiring, it is best to use BV single-core wire to penetrate the pipeline for fixed lines. Be careful not to damage the wires when wiring, and be careful not to damage the wires when decorating the room. Do not connect to the middle of a line. When accessing the electric box (box), do not touch the wires. In addition, household appliances with large power consumption (such as air conditioners, etc.) should be powered by separate wires. Weak current and strong current lines are best kept at a certain distance.
Common faults of wires and cables for electrical equipment include mechanical damage, insulation damage, insulation moisture, insulation aging deterioration, overvoltage, cable overheating faults, etc. If these faults occur in the line, you need to cut off the power supply of the faulty cable, find the fault point, check and analyze the fault, and then perform maintenance and experiments. This cutting can only be restarted after troubleshooting.
What are the safety requirements for wires and cables for buried electrical equipment?
1. When cables cross each other, high-voltage cables should be located under low-voltage cables. If one of the cables is protected by a pipe or separated by a partition within 1 meter before and after the crossing, the minimum allowable distance is 0.15 meters.
2. When the cable is close to or cross the heat pipe, if there are heat insulation measures, the minimum distance of parallel and cross is 0.5 meters and 0.15 meters respectively.
3. When the cable crosses the railway or road, it should penetrate the pipeline protection, and the protection pipe should protrude 2 meters from the track or road.
The distance between the cable and the foundation of the building should ensure that the cable is buried outside the landscape of the building. When the cable enters the building, it must be protected by the official, and the protective tube must also cross the landscape of the building.
The distance between the cable directly buried in the ground and the grounding of the general grounding device is 0.15~0.5 meters; it must be separated. The buried depth of the cable directly buried in the ground, generally not less than 0.7 meters, to be buried in the frozen soil.
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.