Application: this product is suitable for fixed installation in mines, roadways, etc., as the main line of communication and connecting line between the junction box and telephone. HUVV copper core PVC insulated mine of telephone cable laying in the mine, the general situation of ground type polyethylene insulated PVC sheathed duct model name CPEV -s ground type polyethylene insulated PVC sheathed communication cable in the city
产品性能卓越，广泛应用于复杂的工业自动化控制网络及楼宇自控网络一、电缆型号：ZHT-RS486-8系（多股低电容计算机及计算机P.O.S电缆）二、执行标准：执行标准：Q/ZH09.三、产品结构示意图：四、性能参数项目单位指标1*2*24AWG（8201）2*2*24AWG（8202）1*。
100对以上的电缆加有1%的预备线对。
屏蔽：屏蔽层采用轧纹金属带纵包于缆芯包带的外面并两边搭接牢固。
屏蔽层的金属带表面涂敷塑料薄膜，便于与护套粘接，以防止屏蔽层受到腐蚀。
护套：护套为黑色低密度聚乙烯，可根据需要采用双护套。
该电缆主要用于交流或直流300V及以下的工作系统，在500V及以下时能正常工作。
MKVV芯)×（0.75-2.5mm2）煤矿用铜芯聚氯乙烯绝缘聚氯乙烯护套钢带铠装阻燃矿用控制电缆敷设在室内、电缆沟、管道、直埋等能承受较大机械拉力的固定场合。
6、有屏遮结构的软电缆，应不小于电缆外径的6倍。
HYAC_索道电缆吊线采用加粗刚纹线的方法把电缆的拉力增加3吨以上，还可以把RVVP电源线加入电缆中做成复合电缆，经济实用，安装敷设方便。
在-30~C-60~C的环境条件下，自承式电缆的机械和电气性能保持不变。
交流电每秒钟周期性变化的次数叫频率，用f符号表示，单位为周/秒或赫兹(Hz)，我国电网的频率为f=50Hz，周期与频率之间关系为每秒钟所变化的电角度叫角频率（ω），角频率与频率、周期的关系为[例]已知i(t)=7.07sin(300πt-70°)A，u(t)=311sin（300πrad/s+285°）V，则电流i及电压u的相位分别为____、____，它们的相位差为____，i(t)达到零值比u(t)____。
一般采用的方法就是在护套材料中添加含有卤素的卤化物和金属氧化物，从阻燃的角度来评价，这是极好的方法，由于这些材料中含有卤化物，在燃烧时释放大量的烟雾和卤化氢气体，火灾时的能见度低，给人员的安全疏散和消防带来很大的妨碍，而人则更多地为有毒气体窒息致死。
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。
Coaxial cable can be divided into base band coaxial cable and broadband coaxial cable (that is, network coaxial cable and video coaxial cable). Coaxial cable Ω baseband cable and 50 75 Ω broadband cable. The baseband cable is divided into thin coaxial cable and coarse coaxial cable. baseband cables are only used for digital transmission and have a data rate of up to 10Mbps.
Fire - resistant cable refers to the cable which can keep safe operation for a certain period of time under the condition of flame burning. China's national standard GB12666.6 IEC331 (equivalent) will fire test points A, B two levels, A grade flame temperature of 950 ~ 1000 ℃, the duration for fire, 90 min, class B flame temperature of 750 ~ 800 ℃, for fire duration 90 min, during the whole test, the sample should be under the rated voltage value of the product. Fire-resistant cable is widely used in high-rise buildings, subway, underground street, large power stations and the important industrial and mining enterprises and other related to fire security and its lifesaving, for example, fire fighting equipment and emergency light guide emergency facilities such as power supply circuit and control circuit.
可以采用任何一种方式敷设，更适用于岩石地区的直埋敷设。
在一定条件下，也可用于传输2048kbit/s以上的数字信号。
适用于市内、近郊及局部地区架空或管道敷设线路中，也可直埋。
铠装通信电缆型号HYA53WDZ-HYA53ZRC-HYA53。
HYA23 armored communication cables; The mechanical protection layer can be added to any cable, with the mechanical strength and corrosion resistance of the cable. It is a communication cable designed for easy to be machined and vulnerable to corrosion. Any kind of laying can be adopted, which is more suitable for laying in rock area. HYA23 double metal clad double sheath communication cable HYAT series oil filled telecommunication cable (HYAT HYAT23, HYAT53: HYAT23 100 x2x0. Details of the 4: multi-cores iron cable HYAT23 HYA23 200 x2x0. 4 big logarithmic armoured cable HYAT23 logarithmic galvanized steel cable
plc快速入门与提高的方法关于plc学习：PLC学习是学习技术，PLC学习必须是从学与习开始。
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动力是**的老师。
看到这句话不知多少人要拍砖了。
大家对PLC技术必须要有动力，光有兴趣的学习是没有用的。
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这里我们有二个学生，一个是做模具设计的大学生，还有一个是做过二年电工的初中毕业生，连电脑操作都不会，前者只有兴趣又在上班，老婆还要生小孩。
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后者离职学习，认定PLC可以给自己带来月薪万元以上工资。
450/750 v polyvinyl chloride insulated control cable, applicable to dc and ac 50 hz, rated voltage 450/750 v power plants, power plants, factories, mines, ports and petrochemical enterprises such as long-distance control loop, as a connecting line between electrical instrumentation and automation instrumentation, phoresy all kinds of electric energy role, make the whole electric, reliable operation.
敷设时环境温度不低于:固定敷设-30℃,非固定敷设-18℃最小弯曲半径：无铠装层应不小于电缆外径的8倍，带铠装层的电缆应不小于电缆外径的14倍在20℃时用直流500V电压试验稳定充电1min后绝缘电阻应不小于2500MΩ•Km各对绞屏蔽之间以及对绞屏蔽与总屏蔽之间应不断路电缆的线芯和线芯之间以及屏蔽。
2、每个电缆包装上应附有产品质量证明单，证明单放在不透水的袋内，并固定在电缆盘侧。
c、吊装包装件时严禁几盘起吊。
在车辆、船舶等运输工具上，电缆盘必须放稳，并用合适的方法固定，防止互撞或翻倒。
最低环境温度:固定敷设-40℃,非固定敷设-15℃。
The shielding layer can not only restrain the electromagnetic wave from transmitting, but also act as a channel for short-circuit current, which can protect the neutral core. 6/10 kv dedicated cable frequency conversion motor, considering the cables, external force is often in the process of using radial outside the cable shielding layer increased galvanized steel tape armoured layer (between shielding layer and steel tape armoured layer of sleeve).