7、型号及名称：KVV铜芯聚氯乙烯绝缘聚氯乙烯护套控制电缆KVVP铜芯聚氯乙烯绝缘聚氯乙烯护套编织屏蔽控制电缆KVV铜芯聚氯乙烯绝缘聚氯乙烯护套控制电缆KVVP2铜芯聚氯乙烯绝缘聚氯乙烯护套铜带屏蔽控制电缆KVV22铜芯聚氯乙烯绝缘聚氯乙烯护套钢带铠装控制电缆KVVR铜芯聚氯乙烯绝缘聚氯乙烯护套控制。
Our products are widely used in the monitoring of major coal mines and coal mines. Sales to coal companies and mining groups; And become a number of mining equipment companies supporting products, established long-term cooperation relations, products have been users praise and trust! The city at the same time my company production of all plastic communication cable, telephone cable, logarithmic communication cable, computer cable, power cord of communication equipment and railway cable, use flare path, a variety of complete, reliable!!!!!
电气性能:充气电缆主要电气性能：1.充气电缆直流电阻:20℃,0.4≤1480.5≤95.00.6≤65.80.8≤36.62.充气电缆绝缘电气强度：导体之间1min1kv不击穿导体与屏蔽1min3kv不击穿3.充气电缆绝缘电阻：每根芯线与其余线芯接地，HYA电缆大于10000MΩ.km4.充气电。
在传输过程中可以采用增加中继的方法对信号进行放大，最多可以加八个中继，也就是说理论上RS485的最大传输距离可以达到9.6公里。
如果真需要长距离传输，可以采用光纤为传播介质，收发两端各加一个光电转换器，多模光纤的传输距离是5~10公里，而采用单模光纤可达50公里的传播距离。
Precautions for installation of power cables: keep 2m distance when the cable is installed in parallel with the thermal pipe, and 0.5m should be maintained when crossing. The cable shall be installed at a distance of 0.5m in parallel or across other pipelines. When the cable is directly buried and installed, the direct buried depth of 1-35kv cable is less than 0.7m. When 10KV and below cables are installed in parallel, the net distance between them shall not be less than 0.1m and 10-35kv shall not be less than 0.25m. The distance of cross installation is not less than 0.5m. Cable laying temperature lower than 0 ℃, bending radius: multi-core cable or 15 (D + D), a single cable 20 or more (D + D), (D for cable diameter, D) for the conductor diameter. ? 6KV and above cable connector:? When installing the terminal head of the cable, the semiconductor electrical shielding layer must be stripped off. During operation, the insulation shall not be damaged. The shield end should be flat and the graphite layer (carbon particles) should be clean. (2) plastic cable end copper tape screened and armor must be good grounding, the short circuit also follow this principle, avoid unbalanced three-phase run ShiGang armoured end produce inductive electromotive force, and even "lighter" and sheath and other accidents. It is required to use my tinplate to braid copper wire for grounding lead. When connecting with the cable copper belt, it should be welded with chromium-iron tin. ? The shield of three-phase copper tape should be connected with ground wire respectively. Note that the shielded ground wire and steel armor ground wire should be separately drawn out and insulated from each other. The position of the welded ground wire should be as low as possible. Basic requirements for cable terminals and intermediate joints: a. good conductor connection; B. The insulation is reliable, and it is recommended to use irradiated cross-linked heat-shrinkable silicone rubber insulation materials; C. good sealing; D. sufficient mechanical strength to meet various operating conditions. The end of the cable must be used to prevent water and other corrosive materials from corroding, in order to prevent the water tree caused by the aging of the insulation layer and breakdown. Crane or forklift should be used for the loading and unloading of cables. It is forbidden to run flat or lay flat. For installation of large cables, cable laying cart should be used to avoid external damage or abrasion caused by manual dragging. If the cable cannot be laid in time for some reason, it should be stored in a dry place to prevent sunlight from exploding and water entering the end of the cable. ? Note: the installation of wire and cable should be familiar with the performance of wire and cable installation personnel or full-time technical personnel, if there are still unclear matters, ball related technical department or technical department of our factory.
LED灯现在的应用非常广泛，因具有低耗能，高亮度，环保等优点，速度取代了白炽灯和灯管。
为什么有的LED灯关了以后还是会微亮呢？今天我们分析一下原因。
一，开关接的是N零线，当开关断开以后，灯具仍然连着火线，就会发出微弱的光亮。
单控开关的正确的接线解决方案：调整线路，让开关控制火线。
二，双控接线有很多种接法，有个别接法不合理，也可能引起关电以后灯具微亮。
上图也能正常控制LED灯，不合理。
解决方案：调整线路，改成正确的接线。
规格范围型号 芯数 标称截面(MM)BPYJVTP2-TK 3 1.5~240ZRBPYJVTP2-TK。
6：产品性能和参数：导体结构：由7/1.04mm软铜线绞合而成绝缘：绝缘采用交联聚乙烯，绝缘厚度1.0mm，绝缘电阻可以保证在10000MΩ/km以上。
护套：绝缘采用低密度聚乙烯黑色护套，护套厚度1.8mm,从而保证了电缆优良的绝缘性能，防水性能和防老化性能。
RS485通讯线结构:1)导体:多股绞合镀锡铜网线,每股7支,每支导体线径为0.30mm,共四股导体，外径:0.91+/-0.03mm2)绝缘:实芯PE绝缘,外径:1.90+/-0.03mm3)第一屏蔽:铝箔屏蔽4)引流线:多股绞合镀锡铜网线,每股7支,每支导体线径为0.30mm,共一股,外径:0.。
The company solemnly declares: 1. Sign the product guarantee letter, and promise that the unqualified products will never leave the factory. 2. Product tracking service within two years and keep records in the archives for 20 years. 3. Due to product problems, our company will guarantee, refund, replacement and customer requirements.
表3导体标称截面mm2导体结构（根数/单丝直径mm）ABR0.51/0.87/0.3016/0.20.751/0.977/0.3724/0.21.01/1.137/0.4332/0.21.51/1.377/0.5230/0.252.51/1.767/0.6849。
他将此电缆敷设于纽约，开创了地下输电。
次年，英国人卡伦德发明沥青浸渍纸绝缘电力电缆。
1889年，英国人S.Z.费兰梯在伦敦与德特福德之间敷设了10千伏油浸纸绝缘电缆。
1908年，英国建成20千伏电缆网。
五款直流稳压电源电路图电路图一：整个电路通过单片机（AT89C51）控制，P0口和DAC0832的数据口直接相连，DA的CS和WR1连接后接P26，WR2和XFER接地，让DA工作在单缓冲方式下。
DA的11脚接参考电压，通过调节可调电阻使LM336的输出电压为5.12V，在DAC的8脚输出电压的分辨率为5.12V/256=0.02V，也就是说DA输入数据端每增加1，电压增加0.02V。
电路图二：电容降压的5V直流稳压电源，下面这个电源，最大可以提供约55mA电流：电容降压的5V直流稳压电源下面这个电源，最大可以提供约120mA电流：0-300v可调输出电路，这个电路为了与市电隔离加了一个1:1的变压器，可以不用这个变压器而直接输入市电，当然安全上会降低，但不影响使用。
9、外护（适用于铠装电缆23、22、53型）：在铠装层上挤塑一层聚乙烯或聚氯乙烯。
10、可根据用户要求提供防防鼠、白蚁及阻燃等功能电缆。
市内通信电缆用途：主要用于传输音频、150kHZ及以下的模拟信号和2048kbit/s及以下的数字信号。
Type: HB - indoor line code: V - polyvinyl chloride insulation or sheath material Y - polyethylene insulation materials ZR - flame retardant polyethylene insulation materials J - twisted lines of code, code is derived in the form of code, parallel lines of no derived code. Specification code: specification code by 2 times the nominal diameter, conductor is respectively 2 x0. X0.60 50, 2, 2 x0. 80