I. In the selection of wire and cable , generally pay attention to wire and cable models, specifications (conductor cross section) of choice. ⒈ choice of wire and cable models Use of wire and cable, to consider the use, laying conditions and safety; For example, According to different purposes, the choice of power cables, overhead insulated cables, control cables; According to the laying of different conditions, the general choice of plastic insulated cables, steel armored cables, steel wire armored cables, corrosion cables; According to the safety requirements, optional non-flame retardant cables, flame retardant cables, halogen-free flame retardant cables, fire-resistant cables. ⒉ wire and cable specifications of choice Determination of wire and cable specifications (conductor cross-section), the general should consider the heat, voltage loss, economic current density, mechanical strength and other selection conditions. According to experience, low-voltage power line due to its larger load current, it is generally the first choice of heating conditions cross-section, and then check its voltage loss and mechanical strength; low voltage lighting line because of its higher voltage level, the first allowable voltage loss conditions Select the cross-section, and then check the heating conditions and mechanical strength; high-voltage lines, the first choice of economic current density cross-section, and then check the heat conditions and allowable voltage loss; and high-voltage overhead lines, but also checking its mechanical strength. If you have no experience, you should consult the relevant professional units or persons. Description: 1. The same size aluminum wire current carrying capacity of about 0.7 times the copper core, the choice of aluminum core wire can be larger than the copper wire specifications, cross-linked polyethylene insulation can be used a small file specifications, fire-resistant wire and cable should be selected larger specifications . 2. The calculation capacity of this table is based on three-phase 380V, Cosφ = 0.85. If single-phase 220V, Cosφ = 0.85, the capacity should be × 1/3. 3. When the ambient temperature is higher or using the Ming-way, etc., its safety load will decline, this time should choose a larger size; when used for?; Fan motor should be used when large 2 to 3 specifications. 4. The table PVC insulated wires according to a single aerial laying way calculation, if the tube or more laying, you should use a large 2 to 3 specifications. 5 The above data is for reference only, the final design and determine the cable model and specifications should refer to the relevant professional information or electrician manual. Second, the use of wire and cable features Product use characteristics see the specific product description. Third, the wire and cable transport and storage ⒈ transportation is strictly prohibited from dropping from the height of the cable or cable tray, especially at lower temperatures (usually about 5 ℃ and below), throwing, throwing the cable will likely lead to insulation, sheath cracking. ⒉ as far as possible to avoid naked in the open storage of cables, cable tray is not allowed to lay flat. ⒊ lifting the package, it is strictly prohibited at the same time hoisting a few plates. In vehicles, ships and other means of transport, the cable tray to be fixed with the appropriate method to prevent collisions or fall over each other to prevent mechanical damage to the cable. ⒋ cable is strictly prohibited acid, alkali and mineral oil contact, with these corrosive substances isolated storage.Storage cable warehouse shall not damage the insulation and corrosion of metals in the presence of harmful gases. ⒌ Cables should be rolled regularly during the custody period (three months in summer and deferred in other seasons, as appropriate). When rolling, it will roll down the side of the tray roll up, so that the underside damp rot. Always pay attention when storing the cable head is intact. ⒠cable shelf life of the product is limited, generally not more than a year and a half, the longest no more than two years. Fourth, wire and cable installation and construction Wire and cable laying installation design and construction should be GB 50217-94 "Power Engineering Cable Design Code" and other relevant provisions, and use the necessary cable accessories (terminals and connectors). The 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, failures due to construction, installation and connection are often far more likely to cause failures than the faults of wire and cable bodies. Therefore, we must correctly select the wire and cable and ancillary accessories, in addition to the requirements of the specification design and construction, but also pay attention to the following aspects: ⒈ cable laying and installation by qualified professional units or professionals, does not meet the requirements of the relevant provisions of the construction and installation, may lead to cable system can not operate normally. ⒉ human laying cable, command and control should be a unified rhythm, every 1.5 to 3 meters one shoulder carry the cable, while the side of the pull, slowly cast. ⒊ mechanical cast cable, the general use of special cable laying machines and equipped with the necessary traction tools, the appropriate traction size, control, so as not to damage the cable. ⒋ cast the cable before, to check the appearance of the cable and the head is intact, cast attention to the direction of rotation of the cable tray, do not squash or scratch the outer sheath of the cable, in winter when the temperature is not low to straighten the cable, To avoid insulation, sheath cracking. ⒌ laying of the cable bending radius to be greater than the specified value. In the cable laying installation before and after the use of 1000V megger to measure the insulation resistance between the conductors of the cable is normal and according to the cable type specifications, length and ambient temperature of the different measurement results for the appropriate amendments, small size (10m3 solid core Conductor) The cable should also measure the conductor is on and off. < 1 2 > Linear Actuator For Adjustable Bed Linear Actuator Motor,Adjustable Bed Linear Actuator,Actuator For Message Bed,Linear Actuator For Adjustable Bed ZHEJIANG XINYI INTELLIGENT DRIVE TECHNOLOGY CO.,LTD , https://www.xinyiactuators.com