How to choose wires and cables for electrical equipment
Wire and cable for electrical equipmentMust have CCC certification mark. Wire and cable products are national safety certification products. All manufacturers must pass the "CCC" certification certified by my country's Electrical Products Certification Committee and obtain the "CCC" certification mark. The certificate or product must have the "CCC" certification mark. Because the wire relationship is electrical safety, the quality of the wire will affect the safety of our life and property, so please be sure to choose the wire products with CCC certification mark.
Wire and cable for electrical equipmentAppearance
The appearance of good wire products must be smooth and round, and the color is uniform. When purchasing, the wire should be disassembled and checked to confirm whether the appearance is uniform in color. If discoloration occurs, it should be proved that the quality of the wire is not good enough.
Product certificate of wire and cable for electrical equipment
The certificate of conformity of wire products is clearly printed with "CCC" certification mark, trademark, model standard, rated voltage, length, testing, production date, executive standard, factory name, factory location, telephone and other marks. The products that meet the requirements are the products of regular manufacturers and must be carefully checked when purchasing.
Wire and cable for electrical equipment Wire conductor
The conductor must be glossy, and the DC resistance and conductor structure size must meet national standards. Wire and cable products that meet national standards, whether aluminum conductors or copper conductors, are relatively bright and oil-free, and the conductor DC resistance is fully in line with national standards, with good electrical conductivity and high safety. Code Options Method
Code Specification for Wire and Cable for Electrical Equipment
The specifications of the wires are very important, and it is best to use BVV22.5 and BVV21.5 type wires for general household power cords. BVV is the national standard code, copper wire clad double wire BVV22.5 and BVV21.5, respectively, for 2-core 2.5 mm² and 2-core 1.5 mm². Generally speaking, BVV22.5 is the main line and trunk line, and BVV21.5 is a single electrical branch line and switch line. One-way air conditioning line using BVV24, in addition to prepare a dedicated grounding wire.
1. Judging from the packaging, the national standard wires are well done, neat and have a sense of quality in their hands.
2. Open the package and look at the wires inside. National standard wire 1.5-6 square wire requires a skin thickness (insulation thickness) of 0.7mm, too thick is not standard. Accordingly, his mind must not be enough. Silk skin can pull hard. Not easily broken is generally the national standard.
3. Bake with fire. When it disappears within 5s after leaving, it is the national standard line that has certain flame retardant function.
4. Look at the inner core. The higher the brightness of the inner core material (copper), the better the copper, and the luminosity is uniform, shiny, and there is no layering. The national standard requires that the inner core must use oxygen-free copper. Non-target like black pressed copper, there may be a risk of accident.
Different countries have certain requirements for the thickness of the core, but they are not strict. However, there are not many mistakes. Just a little, usually invisible error.
6, the length. The state has to force rice to be beaten, but many manufacturers are also beating rice. The rice is not necessarily the national standard, but the ordinary national standard does not hit the ordinary rice. Meters beyond target shooting are only means.
7, the state stipulates that the wire must have a certain identification. If the maximum does not exceed 500mm, the following same mark will be added. It has the product's trademark, manufacturer's name, executive standard, etc.
Applicable scope of wire and cable for electrical equipment:
Power system: The wire and cable products used in the power system mainly include overhead bare wires, busbars (busbars), power cables), plastic cables, oil-paper power cables, overhead insulated cables), electromagnetic wires and electrical equipment wires and cables for power equipment)
Information transmission system: The wires and cables used in the information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical cables, data cables, electromagnetic wires, power communication or other composite cables.
Mechanical instrument system: This part is used in most products other than overhead bare wires, mainly power cables, magnetic cables, data cables, instrument cables, etc.
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.