Dry goods sharing, one minute to take you to understand the matters needing attention of wire and cable
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. Consumers should pay attention to this when buying the wire. At the same time, when purchasing wires, consumers should pay attention to whether the manufacturer's name, product model, rated voltage and printed marks on the wire surface indicated on the certificate are consistent to prevent counterfeit products.
The appearance of wires and cables-consumers should pay attention when buying wires. The appearance of the wires is smooth and flat, the covering layer is intact, the signs are clear, and the hand-molded wires are not greasy. From the cross-sectional point of view, the thickness of the insulation or sheath on the entire circumference should be uniform, not biased towards the core, and the sheath should have a certain thickness. Wire mirror-consumers should pay attention to whether the wire mirror is consistent with the cross-section indicated on the certificate when purchasing. If the cross-section of the wire is small, it is easy to short-circuit when heating. It is recommended to use wires for household lighting with a specification of 1.5 mm² or more. Air conditioners, microwave ovens and other power appliances to use more than 2.5 mm² specifications of the wire. Specification use-to standardize wiring, fixed lines to use BV single core wire to penetrate the pipeline. Wiring should pay attention not to damage the wire, decorate the room to pay attention not to damage the wire. It cannot be connected in the middle of a route. Contact the electrical box (box) Do not touch the wires. In addition, electrical appliances with large power consumption (such as air conditioners, etc.) should be powered by separate wires. Jiang special wire to keep a certain distance. Common faults of wire and cable include mechanical failure, insulation damage, moisture, insulation aging and deterioration, overvoltage, cable overheating, etc. If these problems occur on the line, it is necessary to cut off the power supply of the faulty cable, find the fault point, check and analyze the problem, and then carry out maintenance and testing. This cutting can only be restarted after eliminating the problem.
What are the safety requirements for buried wires and cables? Let's take a look. 1. Cable wires cross each other, and high-voltage cables should be located under low-voltage cables. If one of the cables is protected or separated by partitions within 1m before and after the crossing, the minimum allowable is 0.15m. 2. When the cable approaches or intersects the heat pipe, if there are heat insulation measures, the minimum distance between parallel and intersection is 0.5m and 0.15m respectively. 3. When the cable crosses the railway or highway, it must penetrate the pipeline protection, and the protection pipe must extend beyond the track or road 2m. 4. Between the cable and the building foundation, it should be ensured that the cable is buried outside the building arithmetic. Cable into the building to pass through the pipe protection, but also to cross the building arithmetic. 5.0.15~0.5m between the cable directly buried in the ground and the grounding of the general grounding device; 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 under the permafrost.
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.