因此，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，但是，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，所以，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。
Tianjin cable factory first branch factory in line with the principle of "customer is god", with "honest and trustworthy, warm and thoughtful" service concept won the trust of the vast number of merchants. My company to the pre-sale, sale, after-sales service to make the following commitments: 1: in order to deepen the understanding of our company, we warmly welcome you leaders, experts to visit factory, our company will provide accommodation and convenient work. 2. Provide users with product price information and product quality information. 3, in order to guarantee the good performance of products, our company adopts domestic high quality materials, and, according to the requirements of ISO 9001 quality assurance system of strict control of material purchasing and acceptance of the unqualified material is strictly prohibited. 4. Our company strictly implements the system of self-inspection, mutual inspection and special inspection. Unqualified semi-products are strictly prohibited from entering the next process, and unqualified products are not allowed to leave the factory. Organize the production strictly according to the standard or the special technical requirements of the customer, and provide **** qualified products to the customer. 5. The electric wires and cables provided by our company guarantee brand-new, mature and reliable performance and meet the standards or customer requirements in all aspects. 6. Our company guarantees that the products provided can operate reliably and safely under the correct installation, normal operation and maintenance.
矿用通信电缆2、绝缘材料：高密度聚乙烯或聚丙烯，按照全色谱标准标明绝缘线的颜色。3、绝缘线对：把二根不同颜色的绝缘线按不同的节距扭绞成对，并采用规定的色谱组合以便识别线对。4、通信电缆缆芯结构：以1对为基本单位，超过25对的电缆按单位组合，每个单位用规定色谱的单位扎带绕扎，以便识别不同的单位。
执行标准GBQ/WTL使用特性1.电缆额定电压UO/U:450/750V，交流聚烯烃UO/U为0.6/1KV2.电缆长期工作温度为：-20℃－90℃，-40℃－105℃3.推荐弯曲半径：无铠装电缆应不小于电缆外径的6倍，有铠装或铜带屏蔽结构的电缆应不小于电缆外径的12倍。
Power cable installation considerations, characteristics and operation condition 1, power cable installation considerations for cable laying parallel with heat pipe installation to keep a distance of 2 m, when crossing, should keep 0.5 m. The cable shall be installed at a distance of 0.5m in parallel or across other pipelines. When the cable is directly buried and installed, the direct buried depth of 1-35kv cable is less than 0.7m. When 10KV and below cables are installed in parallel, the net distance between them shall not be less than 0.1m and 10-35kv shall not be less than 0.25m. The distance of cross installation is not less than 0.5m. 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.
交流接触器是一种应用非常广泛的电气元件，维修电工在工作中经常遇到。现本人就工作中遇到的几种典型案例，来和大家分享一下。这些案例大致分为以下几类：一：交流接触器的线圈电压等级问题二：动作频繁的交流接触器三：尺寸比较大的交流接触器四：工作环境中粉尘比较多的交流接触器下面来详细地一一介绍。交流接触器的线圈电压等级问题我们在工作中，比较常用的交流接触器线圈的电压等级有：AC36V、AC220V、AC380V。
Forlayingindoors、intunnel,cabletrench,ordirectinground,abletobearexternalmechanicalforces,butunabletobearlargepullingforce。
Flame-retardant cables are characterized by a delay in the spread of flame along the cable so that the fire does not expand. Because of its low cost, it is a kind of cable widely used in fireproof cable. Under the condition of single cable or into a bunch of laying, cable to know when the spread of flame can be controlled within a certain range, so it can avoid fire spreading combustion and lining major disasters, which cable line of fire prevention level.
MHY32型弯曲半径不小于电缆直径的15倍。煤矿用控制电缆允许的弯曲半径：对有铠装或铜带屏蔽结构的电缆应不小于电缆外径的12倍。对有屏蔽层结构的软电缆，应不小于电缆外径的6倍。对无铠装层的电缆应不小于电缆外径的6倍。
KVVP铜芯聚氯乙烯绝缘聚氯乙烯护套编织屏蔽控制电缆。KVVP2铜芯聚氯乙烯绝缘聚氯乙烯护套铜带屏蔽控制电缆。KVV22铜芯聚氯乙烯绝缘聚氯乙烯护套钢带铠装控制电缆。KVVR铜芯聚氯乙烯绝缘聚氯乙烯护套控制软电缆。
NHB—VV22适用范围：同NHB—VV，用于能承受机械外力的场所。 NHA—VV22适用范围：同NHB—VV22，用于要求耐火较为苛刻的场所。 NHB—KVV适用范围：固定敷设于室内、隧道内、托架及管道中要求阻燃耐火的场所。
ia-K3YVY本安型PE绝缘PVC护套三芯绞合屏蔽控制电缆适用于要求柔软的场合。ia-K3YV（EX）本安型PE绝缘PVC护套三芯绞合屏蔽仪用电缆固定敷设在室内、电缆沟或管道中。ia-k3YVR（EX）R本安型PE绝缘PVC护套三芯绞合屏蔽仪用软电缆适用于要求柔软的场合。
PLC与PLC之间的通信。通信的基本类型：并行通信与串行通信并行通信:是将一个数据的每一个二进制位，均采用单独的导线进行传输，并将发送与接收方进行并行连接；如下图所示串行通信：是通过一对连接导线，将发送与接收方进行连接，传输数据的每一个二进制位，按规定的顺序，在同一连接导线上，依次进行发送与接收。如下图所示：PLC的通信一般都是用串行通信。标准串行接口用于通信线路连接的输入/输出线路称为接口。连接并行通信线路的称谓并行接口；连接串行通信线路的称谓串行接口。
还可以使用更长的电缆，但是传输率要降低或使用中间放大器。目前，同轴电缆大量被光纤取代，但仍广泛应用于有线和无线电视和某些局域网。射频同轴电缆是指有两个同心导体，而导体和屏蔽层又共用同一轴心的电缆。目前，常用的射频同轴电缆有两类：50Ω和75Ω的射频同轴电缆。
2、成品电缆经受交流50Hz、3kV/5min电压试验不击穿。它的特性：1、交流额定电压：U0/U450/750V。2、电缆导体长期允许最高工作温度：180℃。3、最低环境温度：固定敷设-60℃，非固定敷设-20℃。
接地线选用黄绿双色线，接开关线选用红、黄、蓝、绿、黑等任一种。2000年后，电路设计一般是：进户线6—10mm2，照明2.5mm2，插座4mm2，空调6mm2专线。单芯电线1.5平方电线，用于灯具照明，单芯电线2.5平方电线，用于插座。
因此，变频调速技术在石油、冶金、发电、铁路、矿山等工业方面得到了广泛的使用。1.变频电缆对称性设计对于1.8/3KW及以下变频电机专用电缆，和对称3+1芯和4芯电缆仅可用于主电源的输入缆，但**使用对称结构电缆。