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Temperature (25 ℃) 20 to 30 to 35 40 to 45
The cross section of the control cable is generally no more than 10 square meters, and the power cable is mainly used to transport power, which is generally large. Due to the above all when it comes to the reason, the specifications of the power cable can generally larger, to 500 square feet (normal manufacturer can produce range), again big cross section of the general factory is relatively less, you can do and control cable section generally small, generally not more than 10 square, tell from some cable, power cable according to the demand of power grid more generally for 5 core, and control cable transmission control, some more, according to the terms of more than 61 core, but also can produce according to user requirements.
煤矿用聚氯乙稀绝缘和护套阻燃控制电缆天津市电缆厂MKVVMKVV22MKVV32MKVVRMKVVRPMKVV（2-61芯）MKVV芯） MKVVR （2-61芯）MKVV芯） MKVVP （2-61芯）。
WDZ-KYDYDRP铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套铜线编织屏蔽控制软电缆。WDZ-KYDYDRP2铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套铜带屏蔽控制软电缆。WDZ-KYDPYDP2铜芯无卤低烟阻燃聚烃绝缘聚氯乙烯护套铜带屏蔽控制电缆。
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 equipment, 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.
从网络拓扑结构上来讲，一个局域网通常是两到三层结构。接摄像机那端为接入层，一般用百兆交换机就够了，除非你在一个交换机上接了很多个摄像机。汇集层、核心层则要按该交换机汇聚了多少路图像来计算。计算方法如下：如果接960P的网络摄像机，一般15路图像以内，用百兆交换机；超过15路则用千兆交换机；如果接1080P的网络摄像机，一般8路图像以内，用百兆交换机，超过8路则用千兆交换机。交换机的选择要求监控网络有三层架构方式：核心层，汇聚层，接入层。
b.周围环境温度：25℃ c.土壤热阻系数：1.0K•m/Wd.直埋深度：0.7m e.不同环境温度下载流量校正系数：环境温度（℃）1520253035校正系数1.111.051.000.940.88 ①电缆导体的长期允许工作温度：≤90℃ ②短路时（最长持续时间不超过。
5． 电缆允许弯曲半径：非铠装电缆最小为电缆外径的6倍铜带屏蔽或钢带铠装电缆最小为电缆外径的12倍四：基本型号及名称1．聚乙烯绝缘聚氯乙烯护套本质安全电路甬计算机屏蔽电缆(包括本安用DCS电缆)IA-DJYPVP聚乙烯绝缘铜丝编织分屏总屏聚氯乙烯护套本安用计算机屏蔽(软)电缆IA-DJYP2VP2。
复合铠装电缆（SYV75-5+RVV2X1+RVVP2X0.75）22复合铠装电缆（SYV75-5+RVV2X1+RVVP2X0.75）22复合铠装电缆（SYV75-5+RVV2X1+RVVP2X0.75）复合铠装电缆（SYV75-5+RVV2X1+RVVP2X0.75）22复合铠装电缆（SYV75。
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。
GWDNH-X隔氧层低烟无卤耐火电缆FS-X防水电缆敷设在地下水位常年较高，对防水有较高要求的地区。H-X耐寒电缆敷设在环境温度常年较低，对抗低温有较高要求的地区。FYS-X环保型防白蚁、防鼠电缆用于白蚁和鼠害严重地区以及有阻燃要求地区的电力电缆、控制电缆。
In manufacuring HYA communication cable, mine cable, 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, communication cable in the city the main products are: Manufacuring HYA, HYAT, HYAC HYA22 HYA23, HYAT23, HYA53, HYAT53, ZRC - manufacuring HYA, ZRC - HYAT, WDZ - manufacuring HYA, ZRC - HYA23 series, such as product model complete specifications, has passed the holding center communication equipment network access license, constant standard symbol system certification, sold throughout the country telecommunications company, also become several communications equipment accessories, agreement is well received by customers and trust!
三极管，全称半导体三极管，也称双极型晶体管、晶体三极管，是一种控制电流的半导体器件其作用是把微弱信号放大成幅度值较大的电信号，也用作无触点开关。三极管，是半导体基本元器件之一，具有电流放大作用，是电子电路的核心元件。三极管是在一块半导体基片上制作两个相距很近的PN结，两个PN结把整块半导体分成三部分，中间部分是基区，两侧部分是发射区和集电区，排列方式有PNP和NPN两种。发射区和基区之间的PN结叫发射结，集电区和基区之间的PN结叫集电结。
电缆直埋安装时，1-35KV电缆直埋深度不小于0.7m。10KV及以下电缆平行安装时，相互净距不小于0.1m，10-35KV不小于0.25m；交叉安装时距离不小于0.5m。电缆敷设温度不低于0℃，弯曲半径：多芯电缆≥15(D+d)，单芯电缆≥20(D+d)，（D为电缆外径，d为导体外径）。
3、线对：由a、b两根不同颜色的绝缘线芯绞合成线对。4、缆芯结构：绞合线对组成12、13子单位，25对基本单位，50对、100对和200对超单位。单位外疏绕标志色带。缆芯通常由一个或多个单位组成。5、填充物（仅用于填充型电缆）；缆芯间隙填充阻水化合物。
产品标准GB参照IEC227标准型号、名称及使用范围型号额定电压名称使用条件ZRA-KVVZRC-KVV450/750V0.6/1KV聚氯乙烯绝缘聚氯乙烯护套阻燃控制电缆要求阻燃固定敷设于室内、电缆沟、托架及管道中，或户外托架敷设ZRA-KVVPZRC-KVVP聚氯乙烯绝缘聚氯乙烯护。
HYAT23：铜芯实心聚烯烃绝缘填充式挡潮层聚乙烯护套钢带铠装聚乙烯护套市内通信电缆。ia-K2YV本安型PE绝级、PVC护套二芯绞合屏蔽控制电缆固定敷设在室内、电缆沟或管道中。ia-K2YVR本安型PE绝缘PVC护套二芯绞合屏蔽控制软电缆适用于要求柔软的场合。