The specifications of the wire and cable installation and construction elements

Abstract: the specifications of the wire and cable installation and construction elements of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Choose a, wire and cable specifications: 1, wire and cable model of choice when choosing wire and cable, want to consider to use, installation conditions and security; For example, according to different purposes, the optional power cables, overhead insulated cables, control cables, etc. ; According to the. More flow meter manufacturers choose model price quote you are welcome to inquire, the following is the specifications of the wire and cable installation and construction elements of the article details. Choose a, wire and cable specifications: 1, wire and cable model of choice when choosing wire and cable, want to consider to use, installation conditions and security; For example, according to different purposes, the optional power cables, overhead insulated cables, control cables, etc. ; Depending on the installation conditions, can choose the general plastic insulated cables, steel tape armoured cable, steel wire armoured cable, anti-corrosion cable, etc. ; According to the security requirement, can choose not secondary cable, flame-retardant cables, halogen-free flame retardant cable, fire-resistant cable, etc. 2, wire and cable specifications to determine the choice of wire and cable used specifications ( Conductor cross section) , the general should consider fever, voltage loss, economic current density, mechanical strength, etc. The selection criteria. According to experience, low voltage power line because of the load current is bigger, so the general choice under heating conditions section first, and then calculating the voltage loss and mechanical strength; Low-pressure flare path because of its higher requirements on voltage level, can according to the first selection section allows the voltage loss condition, and then calculating the heating condition and mechanical strength; For high voltage line, according to economic current density first selection section, and then calculating the heating conditions and allow the voltage loss; And high voltage overhead line, should also check its mechanical strength. If the user does not have experience, should consult the opinions of the relevant professional units or persons. Description: ( 1) And the same specifications of aluminum conductor carrying capacity is about 0 copper core. 7 times, choose aluminum conductor is copper conductor is a specification, cross-linked polyethylene insulation can choose a small specifications, fire-resistant wire and cable, choose the larger size. （ 2) , this calculation capacity is the three-phase 380 v, Cosφ = 0. 85 as a benchmark, if the single-phase 220 v, Cosφ = 0. 85, capacity should be & times; A third. 3, when the environment temperature is higher, or by way of Ming fu, its safe carrying capacity would decline, at this time should be chosen large size; When used to frequent starting motor, should choose 2 ~ 3 specifications. 4, data of PVC insulated wire according to single overhead laying methods of calculation, if wear pipe laying or root, should choose 2 ~ 3 specifications. 5, the above data are for reference only, zui throughout design and determine the type and specification of the cable should consult relevant professional information or electrical manual. Second, the use of wire and cable products use characteristics can be found in the specific product catalog. Three 1, wire and cable, transportation and warehousing, transportation, and dropped from a height are strictly prohibited in the cable or the cable with cable, especially at low temperature ( Is usually 5 ℃ or so and below) , throw, fall cable would likely lead to insulation, sheath craze. 2, as far as possible avoid storage in the open air to bare cable, cable tray is not allowed to lie flat, should be made. 3, lifting package, it is forbidden to several plate lifting at the same time. In vehicles, ships and other transportation, cable to use appropriate methods to be fixed, prevent collision or overturned, in order to prevent mechanical damage cable. 4, cable is strictly prohibited contact with acid, alkali and mineral oil, with the corrosive substance for sequestration. Within the warehouse storage cable shall not have damaged the harmful gas of insulation and corrosion of metal. 5, cable during storage, should be regular rolling ( Summer for 3 months time, other seasons can discretionary deferred) 。 When rolling, we will send the under side of the house rolls up, lest floor be affected with damp be affected with damp rot. Store often should pay attention to the cable head are intact. 6, cable storage period is limited to product delivery period, should not be commonly more than a year and a half, zui length less than two years. Four, wire and cable installation and the installation of wire and cable laying construction design and construction should press GB50217 - 94 'electric power cable design code' and other relevant provisions, and USES the necessary cable accessories ( Terminal and connector) 。 Operation quality, safety and reliability of power supply system is not only related to quality of wire and cable itself, also associated with the construction quality of cable accessories and wiring. Statistical analysis through the line fault, due to factors such as construction, installation and connection failure often than electric wire electric cable faults caused by ontology is much more likely. So to correctly choose wire and cable and related accessories, except in accordance with the requirements of specification for the design and construction, should also pay attention to the following problems: 1, cable laying, installation should be carried out by a qualified professional unit or professionals, and do not conform to the requirements of the relevant rules of construction and installation, could lead to a cable system can not run normally.

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