电线电缆工业界中的聚氯乙烯(PVC)即是其中的一例，至今仍在护套和绝缘料中承担着主要角色。
随着社会的进步和科学技术的飞速发展，PVC内在的弱点(燃烧时释放的大量烟雾，严重的腐蚀性气体和有毒气体)益发明显。
CABLE●用于工业环境下各种电气安装，连接、电源、控制、信号等●国标RVVSP电缆●抗电磁干扰屏蔽●信号传输稳定●两两绞合短节距对绞线芯产品特性：整体机械性能优异、信号传输稳定、有一定的柔软性、耐潮、耐寒性、能承受一定的机械应力，使用安全。
产品描述导体：实芯铜导体，直径0.5mm绝缘：实芯聚烯烃线对：四对，色谱为：蓝/蓝白、橙/橙白、绿/绿白、棕/棕白缆芯：四芯绞合护套：阻燃PVC或低烟无卤外径5.6mm特性阻抗：100Ω产品应用10/100base—T以太网（IEEE802.3）10/100base—Tforethernet（IEE。
Mt386-1995 test methods and determination rules for fire retardancy of fire retardant cables used in coal mines and Q/TX 001-2006 plastic insulation control cables used in coal mines.
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。
两相PM型爪极步进电机的旋转原理与本文开头的两相PM型分布线圈步进电机的旋转原理基本相同。
本文第一张图可知，一个线圈只能给一个磁极激磁，爪极电机的一相线圈可以给多极激磁。
下图示出爪极步进电机的旋转原理。
实际的两相PM型爪极步进电机，设计的多极Nr=12，此时定子的爪极数每相有12对极。
为简化原理便于理解，下图将一相简化成一对极。
实际的两相步进电机两相绕组激磁，通常作2相激磁驱动，为说明和理解容易，简化为一相激磁状态的说明，一相激磁如能驱动转子旋转，两相激磁肯定也能运转。
Specializing in the production of research and development of various kinds of flame retardant communication cable, control cable, flame retardant, flame retardant signal cable, communication cable, mining cable, flame retardant mine communication cable, mine, mine communication cable, signal cable, mining control cable, cable for mine monitoring, mine monitoring cable, mine remote sensing cable, control cable, computer cable, flame retardant cable, fire-resistant cable, communication cable in the city, railway signal cable, communications equipment such as the power cord, mine cable main products are: MHYV MHYAV, MHYA32 MHY32, MHYVP, MHYVR, MHYVRP, MKVV, MKVV22, MKVV32, MKVVR, MKVVP etc., all kinds of products are all in the coal Ann mark certificate and complete specifications, products are widely used in the monitoring system of coal mine and coal mine system. The products have been used in dozens of coal industry groups and mines across the country, and have won high evaluation and praise.
Flexible cable RVVT, RVV RVVTP resistance to bending RVVPT RVVT detail TRVV flexible cable, cable RVVTP RVVPT bending resistant cable type: TRVV connection and control using the flexible cable, widely used in dry or wet indoor, reciprocating bend free mobile no compulsory pull drag chain system. Such as machine tool processing equipment, logistics delivery system, port machinery, complete equipment installation engineering. Product features: according to customer requirements, color core or coding core. High quality PVC mix is adopted to reduce the requirement of cable outer diameter for installation space. The designed cycle bending life is 5 million times, and the actual use has exceeded 6 million times. Cable structure: conductor: using multi-strand fine ground and other fine twisted into a bundle conductor oxygen-free copper wire, conform to DIN VDE 0295 grade 6 insulation: high quality PVC mixture color: color line core or coding line core 3 core + yellow or green conductor sheathed: high quality PVC mixture color: black, grey, orange electrical characteristics: rated voltage U0 / U < 0.5 was 300/300 V p o. 5 was 300/500 V test voltage: 3000 V U meet DIN VDE 0281 part 2 temperature range: ℃ mobile installation: fixed installation: - 5 ℃ ~ + 70 ℃ and 30 ℃ ~ + 70 ℃ when continuous movement, the minimum bending radius: 7.5 x cable diameter
We comply with the following production, sales and delivery criteria for all products: 1) production time: the goods can be delivered on the earliest day when there is a spot, and the quantity needs to be customized. 2) sales discount: large quantity is preferred. 3). Sales volume: teleconference. 4) delivery standard: the freight charge shall be borne by the seller. The arrival time is generally 3 days.
用途：本产品用于计算机和自动化设备连接用电缆，它具有抗干扰、信号衰减小等性能。
有普通型、耐寒型等。
聚氯乙烯电力电缆执行标准非阻燃型：GB/T 阻燃型：Q/VAHS6-2006用途 本产品适用于交流50Hz额定电压0.6/1KV的线路中，作输配电能之用。
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
电焊机电缆的二次对地电压交流本产品用于交流额定电压为450/750V及以下的家用电器、电动工具和各类移动电器设备。
二、使用特性（1）YZ型额定电压Uo/U为300/500V，YC型为450/750V。
请勿将正转限位/反转限位用于极限以外的用途。
正转限位/反转限位置为ON时的动作根据极限减速模式(BFM#3b11/BFM#37b11)的设定而不同。
极限减速模式为OFF时的动作(下)运行过程中位于运行方向的正转限位/反转限位置为ON后，立即停止正转脉冲/反转脉冲，输出CLR信号。
(CLR信号的输出脉宽为20ms。
)2.极限减速模式为ON时的动作(下)运行过程中位于运行方向的正转限位/反转限位置为ON后，减速停止。
煤矿用阻燃信号电缆(现统称煤矿用阻燃通信电缆)MHYVR（PUYVR）：聚乙烯绝缘聚氯乙烯护套矿用信号电缆，用于矿场作普通信号传输，可移动使用。
MHY32（PUYV39-1）：聚乙烯绝缘钢丝铠装聚氯乙烯护套煤矿用信号电缆，用于平巷或竖井或斜井作信号传输。
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。