Specifications of wires and cables and elements of construction and installation

Abstract: The specifications of wires and cables and the information on the elements of construction and installation are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. 1. Selection of wire and cable models and specifications: 1. Selection of wire and cable models When selecting wires and cables, the use, laying conditions and safety should be considered; for example, according to different uses, power cables, overhead insulated cables, control cables, etc. can be selected; according to. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the specifications of the wire and cable and the details of the construction and installation elements. 1. Selection of wire and cable models and specifications: 1. When selecting wire and cable models, the use, laying conditions and safety should be considered; for example, according to different uses, power cables, overhead insulated cables, control cables, etc. can be selected; According to different laying conditions, general plastic insulated cables, steel tape armored cables, steel wire armored cables, anti-corrosion cables, etc. can be selected; according to safety requirements, non-flammable cables, flame retardant cables, halogen-free flame retardant cables, Fire-resistant cables, etc. 2. Selection of wire and cable specifications When determining the wire and cable specifications (conductor cross-section), selection conditions such as heat generation, voltage loss, economic current density, and mechanical strength should generally be considered. According to experience, the low-voltage power line has a large load current, so the section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked; the low-voltage lighting line has high requirements on the voltage level. Select the cross section, and then check the heating conditions and mechanical strength; for high-voltage lines, first select the cross-section according to the economic current density, and then check the heating conditions and allowable voltage loss; for high-voltage overhead lines, the mechanical strength should also be checked. If the user is inexperienced, he should consult the opinions of relevant professional units or persons. Note: (1) The current-carrying capacity of the same specification aluminum core wire is about 0.7 times that of the copper core. The aluminum core wire can be one size larger than the copper core wire, the cross-linked polyethylene insulation can be selected with a smaller size, and the fire-resistant wire and cable should be Choose a larger size. (2) The calculated capacity of this meter is based on three-phase 380V, Cosφ=0.85 is the reference, if single-phase 220V, Cosφ=0.85, the capacity should be×1/3. 3. When the ambient temperature is high or the open application method is used, the safe current carrying capacity will decrease. At this time, the larger size should be selected; when the motor is frequently started, the larger 2 to 3 specifications should be selected. 4. The PVC insulated wires in this table are calculated according to the method of single overhead laying. If they are laid through pipes or multiple wires, 2 to 3 specifications should be selected. 5. The above data is for reference only, the final design and determination of the model and specification of the cable should refer to the relevant professional materials or electrician's manual. Second, the use characteristics of wire and cable product use characteristics, please refer to the specific product catalog. 3. Transportation and storage of wires and cables 1. It is strictly forbidden to drop cables or cable trays with cables from a high place during transportation, especially at lower temperatures (generally about 5 °C and below), throwing or dropping cables will cause damage. May cause insulation, sheath cracking. 2. Avoid storing cables in the open air as much as possible. The cable trays are not allowed to be placed flat, but should be placed upright. 3. When hoisting the package, it is strictly forbidden to hoist several trays at the same time. On vehicles, ships and other means of transport, cable reels should be fixed in a suitable way to prevent collision or overturning, so as to prevent mechanical damage to the cables. 4. The cables are strictly prohibited from contacting with acids, alkalis and mineral oils, and should be stored separately from these corrosive substances. There should be no harmful gases that damage insulation and corrode metals in the warehouse where cables are stored. 5. During the storage period, the cables should be rolled regularly (once every 3 months in summer, and can be extended as appropriate in other seasons). When rolling, turn the bottom side of the storage tray upside down to prevent the underside from getting wet and rotting. Always pay attention to the integrity of the cable glands during storage. 6. The storage period of cables is limited to the ex-factory period of the product, generally not more than one and a half years, and the longest is not more than two years. 4. Installation and construction of wire and cable The design and construction of wire and cable installation should be carried out in accordance with GB50217-94 'Code for Design of Electric Power Engineering Cables' and other relevant regulations, and the necessary cable accessories (terminals and joints) should be used. The operation quality, safety and reliability of the power supply system are not only related to the quality of the wire and cable itself, but also to the construction quality of the cable accessories and lines. Through the statistical analysis of line faults, the faults caused by factors such as construction, installation and connection are often much more likely than the faults caused by the defects of the wire and cable itself. Therefore, to correctly select wires and cables and supporting accessories, in addition to the design and construction according to the requirements of the specification, the following aspects should also be paid attention to: 1. The cable laying and installation should be carried out by qualified professional units or professionals. The construction and installation required by the relevant regulations may cause the cable system to fail to operate normally. 2. When laying cables manually, the command and control rhythm should be unified. Every 1.5 to 3 meters, one person should carry the cables on their shoulders, pull them while laying them, and release them slowly.

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