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custom made speedometer cables
Cables are usually made up of several wires or groups of wires.
1:Generally, BVR wires, BVV wires, BV wires, etc. are commonly used in our home decoration, and they are used in large amounts. In general enterprises or large-scale projects, VV, YJV, YJV22, ZR--YJV, NH--YJV, WDZ--BYJ cables and other types are often used. The capital letter B at the beginning of the model number indicates that the conductor material is hard wire, and the capital letter R indicates that the conductor material is flexible wire. The B series, that is, the hard wire series, belongs to the cloth wire category, and the voltage level is 300/500V. The R series is represented as a soft wire. The letter V represents PVC polyvinyl chloride, that is, polyvinyl chloride plastic material, while polyethylene material is represented by Y. L means that the conductor material is aluminum core. At the same time, if there is a B at the end of the name, it means that the wire is a multi-conductor parallel wire. If it is expressed as S, the wire is a multi-conductor stranded wire, which is what we often call a flower wire.
2. The composition of the cable model
Use code - not marked as a power cable, K is a control cable, P is a signal cable; Insulation code - Z oil impregnated paper, X rubber, V polyvinyl chloride, YJ cross-linked polyethylene. Conductor material code - not marked as copper, L is aluminum; Inner sheath code - Q lead sheath, L aluminum sheath, H rubber sheath, V PVC sheath. Derived code - D non-drip, P dry insulation; Sheath code. Special product code - TH humid tropics, TA dry tropics; Rated voltage - unit
3. Calculation method of current carrying capacity of wire and cable
There are many factors that affect the ampacity, and the ampacity of the same wire and cable is not necessarily the same. The size of the nominal cross-sectional area of the conductor core, the material of the conductor, the type of the wire and cable, the location of the laying method, the conditions of the surrounding environment, the temperature, etc., can more or less affect the ampacity of the wire and cable. Therefore, the calculation of ampacity should take into account different conditions at different times. First of all, for ordinary wires and cables, the calculation of current carrying capacity is mainly determined according to the material of the conductor and the size of the nominal cross-sectional area. Generally, the carrying capacity of copper conductors is 5-8A/mm2, and that of aluminum conductors is 3-5A/mm2. Then, the calculation is very simple. For example: the maximum carrying capacity of 6mm2 BV wire is 6×8=48A.Another way is to use the ampacity calculation formula, that is: "Ten down to five; Hundred up to two; Two to five, three to five, four to three circles; Seven to nine to five times and a half; The temperature of the pipe is 10% off; The copper wire is upgraded. Calculate; Bare wire plus one." As long as the relevant knowledge of wire and cable is reasonably integrated and understood, the calculation of current carrying capacity is very simple.
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