2、芯数：6芯（3+3）标称截面（主线芯截面：2.5-240㎜²，副线芯截面:0.5-35㎜²）。
天津市电缆总厂第一分厂本着“顾客就是上帝”的原则，以“诚实守信、热情周到”的服务理念赢得了广大客商的信任。
具有良好的信号传输性能。
带米标识，分100米、200米、500米、1000米木轮包装。
2、铝箔、裸金属丝编织双层屏蔽，PVC外护套，阻燃,外观紫色。
3、符合VDE 0472标准；B类试验（IEC332.1）。
敷设时电缆的温度应不低于0℃，敷设时弯曲半径应不小于电缆外径的10倍。
有铠装层或铜带屏蔽结构的电缆，应不小于电缆外径的12倍。
全塑市话电缆结构特点：HYA型市内通信电缆采用全色谱高密度聚乙稀绝缘，铝塑综合护套(即电缆的纵包屏蔽铝带与护套粘结成一体，形成密封护层)，具有电气性能优越，施工方便的特点。
100对及以上线对的电缆加有1％的预备线对，但最多不超过6对。
缆芯内的间隙用石油膏填充。
缆芯包带：用聚脂薄膜带绕包。
屏蔽：用轧纹(或不轧纹)金属带，金属带纵包于缆芯包带之外。
护套：黑色低密度聚乙烯。
也可提供双层护套的电缆。
HYV, HSYV indoor large logarithmic communication cable is introduced: SPC switching station MDF and exchange between users of audio connection, also can be used for other audio connections between communication e, can support the low rate of data transmission, application support voice, digital telephone, fax, program-controlled switches, digital e connection, telecom integrated system and main branch line, inner conductor wire diameter (mm) : 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, logarithmic (on) : 10-500
单片机的学习者有初入职场的菜鸟工程师，有渴求知识的在校大学生，也有迫于项目需求的电子工程师。
迫于项目需求转换开发平台的电子工程师往往具备其他类型单片机的使用经验，学习新类型的单片机并不会有太大的障碍，菜鸟工程师和在校大学生就是真正的“初学者”。
初学者在开始学习单片机的时候都有一个相同的问题那就是“怎么才能尽快地学会使用单片机?”菜鸟工程师由于身边有“老兵”的指导，加之有目的明确的工程项目的驱动，在单片机学习上并不会走太多的弯路。
Insulation resistance: each conductor and the rest of the grounding wire core, the control cable is more than 10000 m Ω. Km, more than 3000 m Ω HYAT cable. Km.
6、电缆长度：机械保护型电缆是根据相应基本电缆的标准长度制造1产品名称：矿用电缆矿用电缆MHYAV（20 30 50 ）X2X0.8 MHYA322执行标准MT818.3、用途:本产品用于井下作通信焊线、配线和用户线路。
DJYP2V(R)P2-22聚乙烯绝缘铜带绕包分屏总屏聚氯乙烯护套钢带铠装计算机用屏蔽(软)电缆。
DJYVP3(R)-22聚乙烯绝缘铝塑复合带绕包总屏聚氯乙烯护套钢带铠装计算机用屏蔽(软)电缆。
DJYP3V(R)22聚乙烯绝缘铝塑复合带绕包分屏聚氯乙烯护套钢带铠装计算机用屏蔽(软)电缆。
Low smoke zero halogen cables use features: 1. The cable of rated voltage UO/U: 450/750 v ac polyolefin UO/U for 0.6/1 kv2. The long-term working temperature of cable: - 20 ℃ to 90 ℃ and 40 ℃ - 105 ℃ 3. Recommend a bending radius: no armoured cable should be not less than 6 times of cable diameter, structure of armoured or copper tape screened cable should be not less than 12 times of cable diameter.
3、安装敷设环境温度：≥0度，固定敷设时环境温度不低于-10度。
4、电缆允许最小弯曲半径：≥15D(D-电缆外径)。
●产品性能1、设计采用符合GB/T规定的第5类软绞合铜导体。
2、交联聚乙烯绝缘、耐温耐候性好。
Spin cassette XF5-273 communication cable transfer box, adopting advanced technology at home and abroad, in accordance with the international advanced standard production in the eighty s of cable wiring e, for the city, the town of telecommunication network backbone cable and wiring cable transfer. Features: 1. The connection jumper adopts rotary clamp-type connection and is sealed with silica gel on the metal clip, because it is not only reliable and durable, but also easy to operate and repair without stripping. 2. The wiring terminals in the handover box shall be arranged in 25 pairs as a basic unit, consistent with the basic units of the local telephone cables and marked with Numbers on the terminals to facilitate construction and maintenance. 3. The structure, arrangement and installation dimensions of the wiring modules are exactly the same as those of 3M products and can be used for each other. 4. The box body is treated by electrostatic spraying, beautiful and generous, with clear lines, good anti-corrosion and waterproof performance and long service life. Main technical parameters: the environment temperature: - 40 ℃ ~ + 65 ℃ atmospheric pressure: 70 ~ 106 kpa relative humidity: 95% or less is random ends and insulation resistance between terminals and ground > 5 x 104 Μ Ω. When connecting any two ends and any terminals and grounding to 1000V ac, there shall be no breakdown or flying arc in 1min. Contact resistance between wire and terminal < 5 x lO - 3 Ω.
事实上，配电箱里的所有零线都从零排上取（支路开关或用电终端）或所有零线都从开关下口取，也是可以正常使用的。
其它断路器不需要从零排取线除了1P断路器（还有三相电路用到的3P断路器）以外，其它所有断路器都不需要从零排取零线。
比如1P+N断路器1P带附件的断路器（下图带的是漏电保护器附件）2P断路器还有2P带附件的断路器看出区别了吗？这些断路器都有两组接线柱（两个进线两个出线），它们可以从零线的出线位置取零线。
The cable is insulated by full-chromatograph solid polycondensation. The insulated wire is twisted into a pair of twisted wires. Suitable material of cable core is added to the cable core, and the plastic coated aluminum band shielding layer and the black outer expansion sleeve with the length mark in the counting order can be completed. Junction wire: solid annealed copper wire. Copper wire diameter is 0.32, 0.4, 0.6, 0.8 (mm).
MHYVP 2 * 3.3+2 * 0.85 data for mine shielded communication cable 1. Tin coated copper wire is used for conductor, 47/0.3 for conductor, 12/0.3 for 0.85, and 7/0.28 tin coated copper wire for drainage line. 2. Insulation color: 3.3 the wire core is a red one and a blue one, while the 0.85 wire core is a white one and a green one. The white wire core is wrapped with aluminum foil. 3. Insulation thickness: 3.3 core insulation thickness is 0.5, and the outside diameter after insulation is 3.5 mm. The insulation thickness of wire core is 0.7 and the outside diameter after insulation is 2.5mm. 4. Into line with the four wire core is arranged for red, green, blue, white, streamline, and row streamline to conductors are twisted together, don't put longitudinal, are not added when cabling filler, external use aluminum foil winding and cable core, then a layer of polyester film around the package, the outside is a layer of copper wire braided shielding (shielded copper wire tin plating). 5. Sheath: the front diameter is 8.2mm, the back diameter is 12mm (between 11.7mm and 12mm), and the sleeve is flame retardant blue
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、缆芯结构：以25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。
RS485电缆美制标准AWG与公制、英制单位对照表美制AWG外径截面积(mm2)电阻值(W/km)美制AWG外径截面积(mm2)电阻值(W/km)公制mm英制inch公制mm英制inch4/020.。