1. What kinds of wires and cables are commonly used for use?

According to the use can be divided into bare wires, insulated wires, heat-resistant wires, shielding wires, power cables, control cables, communication cables, RF cables and so on.

2. What are the types of insulated wires?

Often insulation wires have the following: PVC insulated wires, PVC insulated soft wire, nitrile PVC mixture insulated soft wire, rubber insulated wires, agricultural underground direct buried aluminum core plastic insulated wires, rubber insulated cotton yarn textile soft wire, PVC insulated nylon sheath wires, electricity and lighting PVC insulated soft wire.

3. What kind of occasion is the cable bridge suitable for?

Cable bridge is suitable for general industrial and mining enterprises indoor and outdoor overhead laying power cable, control cable, can also be used in telecommunications, radio and television and other departments in the indoor and outdoor erection.

4. What are the cable accessories?

Commonly used thermal shrinkage cable accessories have cable terminal junction box, cable indirect wire box, connecting pipe and terminal, steel plate wiring groove, cable bridge and so on.

5, what is called cable intermediate connector?

A device, called a cable intermediate connector, that connects a conductor, an insulating shielding layer, and a protective layer of a cable with a cable to make a cable heat shrinkable pipe.

6. What is the electrical main wiring?

The main electrical wiring is the connection mode of the main electrical equipment and busbar in the power plant and substation, including the connection mode of the main bus and the factory power system according to certain functional requirements.

7. What rules should I follow when selecting the cross section of the power cable?

The selection of power cables should be guided by the following principles:

(1) The rated voltage of the cable shall be greater than or equal to the rated voltage of the installation point power supply system;

(2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the power supply load;

(3) The line core section should meet the requirements of the stability of the power supply system short circuit;

(4) Check the voltage drop according to the cable length to meet the requirements;

(5) The minimum short-circuit current at the end of the line shall enable the protective device to act reliably.

8. What are the advantages of cross-linked polyethylene cable and oil paper cable?

(1) Easy to install, because it allows the minimum bending radius is small, and light weight;

(2) Not subject to line drop limit;

(3) Good thermal performance, allowing high operating temperature, large transmission capacity;

(4) Cable accessories are simple, are dry-type structure;

(5) Simple operation and maintenance, no oil leakage problem;

(6) lower prices;

(7) High reliability and low failure rate;

(8) Less manufacturing process, simple process, significant economic benefits.

9, fixed AC single-core cable fixture what are the requirements? Why?

A: The fixture should be free of iron components to form a closed magnetic circuit, this is because when the cable core through the current, around which the magnetic line is generated, the magnetic line is proportional to the current size through the wire core, if the use of iron parts and other magnetic conductivity materials, according to electromagnetic induction, will produce Eddy current in the iron to heat the cable Therefore, iron parts should not be used as a single-core AC cable fixed fixture.

10. What are the biggest features and advantages of the accessories for the Heat shrinkable cable head below?

A: The biggest feature of the thermal shrinkage attachment is the use of stress tube instead of the traditional stress cone, which not only simplifies the construction process, but also reduces the size of the joint terminal, easy to install, save time and save workers, superior performance, saving metal. Thermal shrinkage Cable Accessories set Perfusion type and dry package as one, set the advantages of these two accessories!

UL is mainly engaged in product safety certification high-temperature heat shrinkable pipe and operating safety certificate business, the ultimate goal is to obtain a fairly safe level of goods for the market, for personal health and property safety to be guaranteed to contribute. In terms of product safety certification as an effective means to eliminate technical barriers to international trade, UL also plays an active role in promoting the development of international trade.

UL Certification

UL was founded in 1894, the initial stage of UL mainly rely on the fire Insurance Department to provide funds to maintain the action, until 1916, UL was completely self-reliant. After nearly a century of development, UL has become a world-renowned certification body, its own set of strict organizational management system, standard development and product certification procedures. UL is managed by a council composed of representatives of security experts, government officials, consumers, education, utilities, insurance and standards departments, and the daily work is handled by the President and Vice president. At present, UL has five laboratories in the United States, headquartered in the northern Chicago town of Northbrook, and in Taiwan and Hong Kong respectively set up corresponding laboratories. In the United States, UL is a symbol of safety for consumers, and globally, UL is one of the most trusted providers of qualified assessments for manufacturers.

电线电缆附件及热缩管环保UL认证知识

1、常用的电线、电缆按用途分有哪些种类？

按用途可分为裸导线、绝缘电线、耐热电线、屏蔽电线、电力电缆、控制电缆、通信电缆、射频电缆等。

2、绝缘电线有哪几种？

常有的绝缘电线有以下几种：聚氯乙烯绝缘电线、聚氯乙烯绝缘软线、丁腈聚氯乙烯混合物绝缘软线、橡皮绝缘电线、农用地下直埋铝芯塑料绝缘电线、橡皮绝缘棉纱纺织软线、聚氯乙烯绝缘尼龙护套电线、电力和照明用聚氯乙烯绝缘软线等。

3、电缆桥架适合于何种场合？

电缆桥架适用于一般工矿企业室内外架空敷设电力电缆、控制电缆，亦可用于电信、广播电视等部门在室内外架设。

4、电缆附件有哪些？

常用的热缩电缆附件有电缆终端接线盒、电缆中间接线盒、连接管及接线端子、钢板接线槽、电缆桥架等。

5、什么叫电缆中间接头？

连接电缆与电缆的导体、绝缘屏蔽层和保护层，以使电缆线热缩管路连接的装置，称为电缆中间接头。

6、什么叫电气主接线？

电气主接线是发电厂、变电所中主要电气设备和母线的连接方式，包括主母线和厂用电系统按一定的功能要求的连接方式。

7、在选择电力电缆的截面时，应遵照哪些规定？

电力电缆的选择应遵照以下原则：

（1）电缆的额定电压要大于或等于安装点供电系统的额定电压；

（2）电缆持续容许电流应等于或大于供电负载的最大持续电流；

（3）线芯截面要满足供电系统短路时的稳定性的要求；

（4）根据电缆长度验算电压降是否符合要求；

（5）线路末端的最小短路电流应能使保护装置可靠的动作。

8、交联聚乙烯电缆和油纸电缆比较有哪些优点？

（1）易安装，因为它允许最小弯曲半径小、且重量轻；

（2）不受线路落差限制；

（3）热性能好，允许工作温度高、传输容量大；

（4）电缆附件简单，均为干式结构；

（5）运行维护简单，无漏油问题；

（6）价格较低；

（7）可靠性高、故障率低；

（8）制造工序少、工艺简单，经济效益显著。

9、固定交流单芯电缆的夹具有什么要求？为什么？

答：夹具应无铁件构成闭合磁路，这是因为当电缆线芯通过电流时，在其周围产生磁力线，磁力线与通过线芯的电流大小成正比，若使用铁件等导磁材料，根据电磁感应可知，将在铁件中产生涡流使电缆发热，甚至烧坏电缆。所以不可使用铁件作单芯交流电缆的固定夹具。

10、以下的热缩电缆头的附件的最大特点和优点是什么？

答：热缩附件的最大特点是用应力管代替传统的应力锥，它不仅简化了施工工艺，还缩小了接头的终端的尺寸，安装方便，省时省工，性能优越，节约金属。热缩电缆附件集灌注式和干包式为一体，集合了这两种附件的优点！

UL主要从事产品的安全认证高温热缩管和经营安全证明业务，其最终目的是为市场得到具有相当安全水准的商品，为人身健康和财产安全得到保证作出贡献。就产品安全认证作为消除国际贸易技术壁垒的有效手段而言，UL为促进国际贸易的发展也发挥着积极的作用。

UL认证

UL始建于1894年，初始阶段UL主要靠防火保险部门提供资金维持动作，直到1916年，UL才完全自立。经过近百年的发展，UL已成为具有世界知名度的认证机构，其自身具有一整套严密的组织管理体制、标准开发和产品认证程序。UL由一个有安全专家、政府官员、消费者、教育界、公用事业、保险业及标准部门的代表组成的理事会管理，日常工作由总裁、副总裁处理。目前，UL在美国本土有五个实验室，总部设在芝加哥北部的Northbrook镇，同时在台湾和香港分别设立了相应的实验室。在美国，对消费者来说，UL就是安全标志的象征，全球，UL是制造厂商最值得信赖的合格评估提供者之一。