●三相系统用电缆的Uo值推荐如下表：UkvUmkvUo*kvA和B类系统C类系统67.23.66101268.71517.58.71220241218303618-3540.52126A类系统--该类系统任何一相导体与地或接地导体接触时，能在1min内与。
公司在研制生产“通信电源用阻燃耐火软电缆”时，对电缆的绝缘、护套采用了低烟无卤、分解温度高、机械性能好的无卤聚合物材料，由于电缆不含卤化物和金属氧化物，在燃烧时不会产生有害气体和大量的烟雾，不存在会造成“二次灾害”的可能性，并且还具有良好的机械性能与电气性能，满足了电缆的使用要求，彻底改变了以往阻燃。
二、技术参数：导线线芯长期允许工作温度不超过70℃，允许弯曲半径不小于电缆外径的10倍。
电缆线芯之间，线芯与屏蔽之间能承受交流50HZ1000V电压试验5min。
电缆任一绝缘线芯在IKHz时的工作电容不大于200nF/KM。
450/750 v, PVC insulated control cable is suitable for the 450/750 v dc and ac 50 hz, rated voltage of the power plants, power plants, factories, mines, ports and petrochemical enterprises such as long-distance control loop, as between electrical instrumentation and automation instrumentation cables, phoresy all kinds of electric energy role, make the entire electrical system safe and reliable operation.
填充材料填充式电缆应在缆芯的间隙及缆芯与包带的间隙均匀而连续地填满符合规定的填充复合物。
缆芯包带缆芯包带用具有足够的隔热性能和机械强度的绝缘带重叠绕包。
以防导体绝缘在加屏幕和挤出挤套过程中粘接、变形和损伤。
plc网络是由几级子网复合而成，各级子网的通信过程是由通信协议决定的，而通信方式是通信协议最核心的内容。
通信方式包括存取控制方式和数据传送方式。
所谓存取控制（也称访问控制）方式是指如何获得共享通信介质使用权的问题，而数据传送方式是指一个站取得了通信介质使用权后如何传送数据的问题。
自由口通讯一般是指RS232的串行通讯方式，其通讯距离较短，速率较慢，一般在现场的某些仪表会采用这种方式，比较典型的是西门子的PC-PPI通讯；2.总线一般指RS485的串行通讯方式，其通讯距离和速率要远高于RS232通讯方式，一般现场的PLC或变频器等设备用此协议较多，比较典型的是西门子的Profibus-DP，Modicon的Modbus等；3.以太网采用的是国际通用的以太网通讯协议，具备相当高的速率，但其问题是设备成本较前两种方法要高很多，没有总线方式普及。
2ia-KVPVP铜芯聚氯乙烯绝缘及护套铜丝编织分屏蔽及总屏蔽本安用控制电缆3ia-KVP2V铜芯聚氯乙烯绝缘及护套铜带屏蔽本安用控制电缆4ia-KVP2VP2铜芯聚氯乙烯绝缘及护套铜带分屏蔽及总屏蔽本安用控制电缆5ia-KVP3V铜芯聚氯乙烯绝缘及护套铝／塑复合膜分屏蔽本安用。
标记间隔不大于1m。
其他结构：根据使用场合、用户要求，可提供各种形式的电缆，以满足各种敷设环境条件的要求。
聚氯乙烯绝缘和护套阻燃控制电缆聚氯乙烯绝缘和护套阻燃控制电缆是聚氯乙烯绝缘和护套控制电缆的更新换代产品，该产品除具有聚氯乙烯绝缘和护套控制电缆的性能外，还具有良好的阻燃性能。
产品型号：TRVV中度柔性非屏蔽拖链电缆电缆结构：导体：超细精绞无氧铜丝符合VDE0295CLASS6标准绝缘：特殊混合PVC柔性绝缘线芯：两芯及以上集束绞合护层：(可选)无纺布护套：丁腈混合柔性护套颜色：黑色(RAL9005)灰色(RAL7001)橙色(RAL2003)额定电压：截面＜0.5mm²。
耐高温控制电缆:我公司是专业生产电线电缆的厂家.主要产品有F46系列耐高温电缆,仪表电缆,计算机电缆,本安电缆,DCS电缆.屏蔽电缆系列电线电缆.KFF,AF,KFFP,DJFPVP,KFFRP KFF、KFFP、KFF22、XKFF、XKFFP、XKFFP22 .耐高温控制电缆（KFFKFFPKF。
JVVP22，JVVP2-22，JVVP3-22，DJYVP22，DJYJVP22，DJVVP22，DJYPV22，DJYJPV22，DJVPV22，DJVPVP22，DJYPVP22，DJYJPVP220.5-1.5mm25-64对（3线组）DJYVP3-22,DJVVP3-22,DJYJVP3-。
DJVPV(R)P聚氯乙烯绝缘铜丝编织分屏总屏聚氯乙烯护套计算机用屏蔽(软)电缆。
DJVV(R)P2聚氯乙烯绝缘铜带绕包总屏聚氯乙烯护套计算机用屏蔽(软)电缆。
DJVP2V(R)聚氯乙烯绝缘铜带绕包分屏聚氯乙烯护套计算机用屏蔽(软)电缆。
27，电功率：单位时间(1s)电流所做的功叫作电功率,用符号P表示,单位为W或kW。
28，瞬时功率：交流电路中任一瞬间的功率称为瞬时功率,用符号Pt表示,单位为W或kW。
29，有功功率：正弦交流电路的瞬时功率在一个周期内的平均值,称为有功功率,用字母Pa表示,单位为W或kW。
30，视在功率：电流I和电压U的有效值的乘积称为视在功率,用字母S或Ps表示,单位为VA或kVA。
31，无功功率：具有电感或电容的电路中,在半周期的时间里,电源的能量变成磁场(或电场)的能量储存起来,而在另半周期的时间里,又把储存在磁场(或电场)的能量释放出来送还电源。
Low smoke and low halogen flame retardant control cables are suitable for the use of ac rated voltage 450/750v and below control, monitoring circuit and protection line with certain environmental protection requirements. Operating conditions (1) rated voltage U0/U is 450/750v; (2) the cable conductor allowed to work at 70 ℃ for a long time; (3) the cable temperature under installation should not below 0 ℃, allowed bending radius; recommended by (4) the cable without armor layer shall be no less than 6 times the outer diameter of the cable; (5) the cable with armored or copper belt shielding structure shall be no less than 12 times the outer diameter of the cable; (6) the soft cable with shield layer structure shall be no less than 6 times of the cable. Technical requirements for 20 ℃ dc resistance conductors shall comply with the terms of GB9330.1 insulation resistance are shown in table 3 - table 6. The fire retardant performance test of the cable conforms to the provisions of GB/T18380. If the user does not require it to meet the requirements of class C fire retardant. The cable smoke concentration shall comply with the provisions of GB/T17651, and its light transmittance shall be 60%. The halogen content should not exceed 100 mg/g. Other performance requirements are the same as GB9330.
MKYJVP MKYJV cable, cable, MKYjVP2 cable, MKYJV22 cable, MKYJV32 cable, MKYJVR cable, MKYJVRP cable, MKYJVP22 cable and other types of flame retardant control cable, recommend some cable 2,3,4,5,7,8,10,12,14,16,19,24,27,30,37,44,48,52,61 core.
Product introduction - mine control cable MKVV mine control cable MKVVR mine control cable shielding control cable MKVV32 MKVVP mining mine control cable MKVVRP mine shielding control cable for mine control cable MKVV22 mine flame-retardant control cable for mine monitoring control cable for mine cable type MKVV, MKVV22, MKVV32, MKVVR, MKVVP, MKVVRP 1, mine control cable standards and specifications: MT818-1999-2, flame-retardant control cable for mine purposes: This product is suitable for the control and monitoring circuit with rated ac voltage u0/u of 450/750v or below and the connecting line of the protection circuit and the electrical instrument in the distribution device. 3. Model specifications and scope of mine control cable products: Model specifications of the control cable for mining use: MKVV,MKVVP, mkvvvvvvvvvvp2-10mm2,2-61 cores are applicable to the weak current control system or mkvvvv22 of the strong electromagnetic field interference area. MKVV20 0.5-10mm2,4-61 core mkvvv32, mkvvvvv30 0.5-10mm2,7-61 core MKVVR 0.5-6mm2,2-61 core MKVRP 0.5-4mm2,2-61 core mkvvvvvvp22, mkvp2-221.5-10mm2, 4-22 core mkvp2, 1.5-10mm2 Is mainly used for 500 kv substation and power distribution device and strong electromagnetic interference zone MKVV - 1, MKVV22 0.5 was 10-1, 4, 2-61 core 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.
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.