二：产品执行标准阻燃耐火特性试验执行GB标准三：使用特性1．交流额定电压：U0/U450/750KV2．最高工作温度：聚全氟乙丙烯(F46)绝缘不超过200℃可溶性聚四氟乙烯(PFA)绝缘不超过260℃3．最低环境温度：聚氯乙烯护套：固定敷设-40℃，非固定敷设-15℃氟塑料及硅橡胶护套：固定敷设-。
它的含卤量约为含卤阻燃电缆的1/3左右。发烟量也接近于公认的“低烟”水平。根据《电线电缆燃烧试验方法》的规定，采用成束燃烧试验方法考核的阻燃电缆分为A、B、C3类，其中A类电缆试验条件最苛刻，性能较B、C类更优，价格也最贵。
产品描述：特性阻抗120欧姆，导体为2*2*24AWG多股镀锡电解铜丝绞合而成，花色绝缘护套宜于安装识别，铝箔/聚酯带总体****屏蔽，附加独立多股绞合镀锡铜丝接地导体，工业灰色PVC外护套，符合ULAWM2919文件。
Flame retardant cables and fireproof cables: the difference between the average person is very easy to confuse the concept of flame retardant cables and fireproof cables, although there are many more flame retardant cable applies to the advantages of chemical enterprise, such as low, low smoke, non-halogen, but in general, fire-resistant cable can replace flame retardant cable, and flame retardant cables can't take place of fire-resistant cable.
Calibration factor 1.11 1.05 1.00 0.94 0.88
三菱plc源型和漏型的区别，咱们先说下三菱plc的基本单元的输入驱动电源有两种，一种是交流电源100V输入驱动(少见)，一种是直流电源24V输入驱动(常见的)，交流型的不存在漏源型之分，只有直流输入才分源型输入和漏型输入。同样对于输出也是一样，有继电器、晶体管、晶闸管类型输出，其中只用晶体管输出才分源型和漏型。那么具体怎么区分三菱PLC的类型，我们得从它的铭牌入手如下图所示：主要看PLC型号的后两位字母，具体型号可以参考上图中的标注，那么漏型和源型有什么区别呢，在三菱plc中定义当DC输入信号是从输入(X)端子流出电流然后输入时，称为漏型输入；当DC输入信号是电流流向到输入(X)端子的输入时，称为源型输入，从接法上看主要是区分公共端S/S是接电源正极还是负极，如果是接24V则是漏型输入，如果接0V则是源型输入。
Tianjin cable pull branch factory in line with the principle of "customer is", with "honest, trustworthy, thoughtful" service concept won the trust of the extensive business.
DJYP2V(R)P2聚乙烯绝缘铜带绕包分屏总屏聚氯乙烯护套计算机用屏蔽(软)电缆。DJYV(R)P3聚乙烯绝缘铝塑复合带绕包总屏聚氯乙烯护套计算机用屏蔽(软)电缆。DJYP3V(R)聚乙烯绝缘铝塑复合带绕包分屏聚氯乙烯护套计算机用屏蔽(软)电缆。
理论上RS485的传输距离能达到1200米，但实际应用中传输距离要小于1200米，具体长度受周围的环境影响。RVVP屏蔽电缆执行标准JBRVVP屏蔽电缆产品介绍：RVVP屏蔽电缆，额定电压300V/300V。
实验规定在垂直8英尺高的支架上敷设多条试样，用规定的20KW带状喷灯燃烧（70，000BTU/Hr）20分钟。合格标准为火焰不可蔓延到电缆的上端并自行熄灭。UL1581和IECC类似，只是敷设电缆根数不同。
ZR-BPYJVP3交联聚乙烯绝缘聚氯乙烯护套铝聚酯复合膜绕包屏蔽变频电力电缆。阻燃电缆：由于电缆线路起火带来的危害,促使****都把电缆的阻燃性放到日益重要的位置上，我公司生产阻燃电缆见表1－2。适用于交流额定电压U0/U=450/750V供电，监控等回路中。
变频电缆使用条件1、额定电压U0/U：0.6/1KV.2、电缆导体长期允许最高温度为90度,短路时最高温度250度3、安装敷设环境温度不低于0度,固定敷设时环境温度不低于-10度.4、电缆允许最小弯曲半径不小于15D(D-电缆外径,mm)变频电缆性能1、BRYJVP12R-TK、ZRBPYJVP12。
PLC控制电气元件PLC的学习大致分为开关量、模拟量、通信这三部分内容，控制的电气元件主要有逻辑开关器件、变频器驱动系统、伺服驱动系统、传感器的控制和数据采集系统。从PLC的角度看有输入、输出、通信系统，输入分为开关量输入如按钮、旋钮、脚踏开关等普通输入，编码器脉冲的高速输入；输出有中继、接触器、指示灯等普通输出，还有控制伺服驱动使用的高速脉冲输出。除了开关量的输入和输出，还有模拟量的输入与输出，比如变频器频率的控制、气阀调节使用的模拟量输出控制，电流信号、温度信号的采集使用的模拟量输入。
Cable temperature under installation should not below: polyvinyl chloride sheathed cable 0 ℃, silicon rubber sheathed cable - 20 ℃, fluorine plastic sheath cable - 20 ℃.
1. Mine control cable execution: mt818-1999? 2. Mine flame retardant control cables: this product is applicable to ac rated voltage u0/u of 450/750v. And the following control and control circuits and the protection lines and the connection lines of the electrical instruments in the distribution equipment. ? 3. Model specifications and scope of mine control cables:? Model of control cable for mine? Specification range? Using MKVV MKVVP, MKVVP2? 0.5 - was 10, 2-61 core? Suitable for weak current control or strong electromagnetic field area mkvvvv22, mkvvvvv20? 0.5 - was 10, 4-61 core? MKVV32, MKVV30? 0.5 - was 10, 7-61 core? MKVVR? 0.5-6 was, 2-61 core? MKVVRP? Was 0.5-4, 2-61 core? MKVVP22 MKVVP2-22? 1.5 - was 10, 4-61 core? MKVVP2-22-1? 1.5 - was 10, 4-61 core? Mainly used in 500KV substation and power plant distribution device and high electromagnetic field area mkvv-1, mkvvvvv22-1? 0.5 - was 10, 2-61 core? 4, using features: coal mine with control cable conductor long-term allowed working temperature is 70 ℃, the cable temperature under installation should not below 0 ℃. Permissible bending radius of control cables used in coal mines: for cables with armored or copper band shielding structures, the bending radius should not be less than 12 times of the outer diameter of the cables. For soft cable with shield layer structure, it should be no less than 6 times the outer diameter of the cable. The cable without armor layer should not be less than 6 times the outer diameter of the cable. ?