1.5综合护套铁路信号电缆的理想屏蔽系数≤0.8；铝护套铁路信号电缆的理想屏蔽系数≤0.32型号、名称及规格-铁路信号电缆PTYAT22型号名称敷设范围规格（芯）-铁路信号电缆PTYAT22PTY23聚乙烯绝缘钢带铠装聚乙烯外护套铁路信号电缆PZYA22聚乙烯绝缘综合护套钢带铠装聚氯乙烯外护套铁路信。
为了减少回路间的相互串扰和外部干扰，电缆采用屏蔽结构。
电缆的屏蔽要求是根据不同场合分别采用：对绞组合屏蔽、对绞组成电缆的总屏蔽、对绞组合屏蔽后总屏蔽等方法。
屏蔽材料有圆铜线，铜带、铝带/塑料复合带三种。
MHYA32 (HUYA32) galvanized steel wire armoured, flame retardant PVC sheathed communication cable and cable communication cable coal mine using 40 ℃ to + 50 ℃, environment temperature - p - 10 ℃, the cable laying temperature at 25 ℃ temperature of 95% or less, when cable laying bending radius: MHYV type cable 10 times the cable diameter or the rest of the type of cable or greater executive standard: 15 times the cable diameter MT8 named code: coal mine communication cable... MH(HU) copper core Omitted polyethylene insulation Y aluminum - polyethylene bonding layer A polyethylene inner sheath Steel wire woven armor is omitted B blue flame retardant PVC sheath V steel wire armored blue flame retardant PVC outer sheath...... 32
多年的“计算机电缆R;DJYPVPR22;DJYPVPR32;DJYJPV,DJVPVP,DJYPVP,DJYJPVP电子计算机电缆DJYVPR;D。
2.使用特性1额定电压U0/U为300/500V及以下。
现在将一些错误的观念作出一些澄清。
1.485信号线可以和强电电源线一同走线。
在实际施工当中，由于走线都是通过管线走的，施工方有的时候为了图方便，直接将485信号线和电源线绑在一起，由于强电具有强烈的电磁信号对弱电进行干扰，从而导致485信号不稳定，导致通信不稳定。
安装补偿电容器的环境要求如下：电容器应安装在无腐蚀性气体、无蒸汽，没有剧烈震动、冲击、爆炸、易燃等危险的场所。
电容器的防火等级不低于二级。
装于户外的电容器应防止日光直接照射。
电容器室的环境温度应满足制造厂家规定的要求，一般规定为40℃。
电容器室装设通风机时，出风口应安装在电容器组的上端。
进、排风机宜在对角线位置安装。
电容器室可采用天然采光，也可用人工照明，不需要装设采暖装置。
高压电容器室的门应向外开。
KVV32聚氯乙烯绝缘，细钢丝铠装聚氯乙烯护套控制电缆敷设在室内、电缆沟中、管道、竖井内及地下，能承受一定的拉力作用。
MHYV（HUYV)矿用聚乙烯绝缘、阻燃聚氯乙烯护套通信电缆。
MHJYV(HUJYV)矿用聚乙烯绝缘、阻燃聚氯乙烯护套加强型通信电缆。
单芯电线4平方电线用于3匹空调以上，单芯电线6平方电线用于总进线，双色线用于接地线。
二芯、三芯护套电线是做明线使用，多用于工地上施工用，家装不太用到。
三芯护套电线2.5平方可用于柜式空调上用。
聚氯乙烯绝缘矿用执行标准:YD/T产品用途:本产品适用于固定敷设在矿井、巷道等作通信干线及分线箱与机的连接线。
规格：截面0.50.75mm2及以下2.5mm2以上A类78聚氯乙烯护氟塑料护套聚氯乙烯护氟塑料护套B类/0.219/。
注：ZR-阻燃 G-隔氧层 NH-耐火三、生产范围型号芯数标称截面（mm2) 型号芯数标称截面（mm2)额定电压（KV） 额定电压（KV）0.6/1 0.6/16/6(6/10)8.7/10(8.7/15)26/35(26/45)CUAL CU。
HJVV5x2x0.4 HPVV5x2x0.4HJVV5x2x0.5 HPVV5x2x0.5 HJVV10x2x0.4 HPVV10x2x0.4HJVV10x2x0.5 HPVV10x2x0.5 HJVV20x2x0.4 HPVV20x2x0.。
合理的结构设计，严格的选材，精良的生产加工，严格的质控程序，保证产品在实际应用中效果良好。
阻燃软电缆RVVZ型红、黄、蓝、绿、黑、黄绿双色(接地用)适用范围该电缆广泛应用于邮电、铁路、化工等行业的输配电系统，特别适用于机房配电系统的内部连接线,也可作为移动电缆使用。
外部输入触点电路断开时，对应的输入映像寄存器为0状态，梯形图中对应的输入继电器的常开触点断开，常闭触点接通。
某一编程元件对应的映像寄存器为l状态时，称该编程元件为ON，映像寄存器为0状态时，称该编程元件为OFF。
在程序执行阶段，外部输入信号的状态发生了变化，输入映像寄存器的状态也不会随之而变，输入信号变化了的状态只能在下一个扫描周期的输入处理阶段被读入。
PLC的用户程序由若干条指令组成，指令在存储器中按步序号顺序排列。
Ii. Implementation standards
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.
The advantages of electric cable are more and less. Generally, it is buried in the soil or laid in indoor, ditch, middle, line insulation distance is small, no tower, little, basically no surface space. High reliability. It is less affected by climatic conditions and surroundings, and has high transmission performance and reliability. It has more favorable conditions for the development of ultra-high voltage and large capacity, such as low temperature, superconducting power cable, etc. The distributed capacitance is large. Less work. Less likely.
Fire-resistant cable/NHVV fire-resistant power cable, this product according to GB12706 the rated voltage up to and including 35 kv plastic insulated power cable, copper, aluminum core and GB12666 standard production of wire and cable combustion experiment method, this product is suitable for rateduency voltage up to and including 0.6/1 kv power distribution lines or fixed installation with industrial e Fireproof cable /NHVV fireproof power cable, fireproof PVC insulated cable is suitable for densely populated and ventilated places such as underground railway, underground market, large shopping center and high-rise buildings.