二:产品执行标准Q/HHTZH007.1阻燃性能试验执行GB规定三:使用特性1.交流额定电压:U0/U0.6/1KV最高工作温度:105℃最低环境温度:固定敷设-40℃2.电缆安装敷设温度应不低于-25℃。

HJYVP3/SA成束阻燃型聚乙烯绝缘、聚氯乙烯护套、铝塑复合带绕包总屏蔽呼叫通信电缆。
HJYJV/SA成束阻燃型交联聚乙烯绝缘、聚氯乙烯护套、呼叫通信电缆。
HJYJVp/SA成束阻燃型交联聚乙烯绝缘、聚氯乙烯护套、编织总屏蔽呼叫通信电缆。
也可提供双层护套的通信电缆。
具有防火,防潮等特点矿用通信电缆引发火灾的原因,主要是因为过负荷、短路、接触电阻过大及外部热源作用。
在短路、局部过热等故障状态及外热作用下,绝缘材料绝缘电阻下降、失去绝缘能力,甚至燃烧,进而引发火灾。
This is the flame retardant standard for bundles of cables. According to the test regulations, the 3.5m long cable samples are fixed with iron wire on the trapezoid test frame, and the number of samples is determined according to the different classification requirements of non-metallic materials. The sample is hung vertically on the back wall of the furnace, and air is introduced into the furnace through the inlet on the bottom plate.

接地引出线要求采用我镀锡编织铜线,和电缆铜带连接时应用铬铁锡焊,不宜用喷灯封焊,以免烧损绝缘。
③三相铜带屏蔽应分别与地线相连,注意屏蔽接地线和钢铠接地线应分别引出,相互绝缘,焊接地线的位置应尽量靠下。
单片机的时钟为11.0592MHz。
那么使用模块化编程的方法,整个项目将会有如下表中的文件。
表1工程文件清单C文件H头文件描述main.c无Main文件可以没有对应的头文件TImer0.cTImer0.h定时器0定时50ms中断led.cled.hLed闪烁实现uart.cuart.h串口通信配置实现digitron.cdigitron.h数码管显示2.1创建工程步骤2.1.1新建工程文件目录新建工程文件目录(如test),在工程目录下创建Project、SourcOutput、LisTIng和Readme这5个文件夹,并在文件夹Readme下创建Readme.txt文件。
主要用于火灾报警、消防设备、排烟设备、以及紧急通道运输、照明等应急设施的供电线路中需要耐火的场合。
(4)电缆安装时的最小弯曲半径:a、低烟无卤阻燃、耐火控制电缆:无铠装层的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。
8 x2x0 DJYVP3R. 75?? 8 x2x1. 0?? Fire retardant computer cable zr-djyvp22; ZR - DJYPV22; ZR - DJYPVP22 DJYVP3R? 1. Use (Q/NPDL 010-2003) this product is suitable for cables with high anti-performance requirements for electronic computer monitoring and is also suitable for cables with high anti-capability requirements for testing instruments and instruments. 2. Performance 1 rated voltage U0/U is 300/500v and below. 2 cable allows - 40 ℃ ~ + 55 ℃ temperature range. In use, the cable should prevent high temperature direct radiation or. 3 cable conductor long-term allowed working temperature is 70 ℃, the temperature under installation should not below 0 ℃. 4. Allowable bending radius of cables: the cable without armor layer shall not be less than 6 times of the outer diameter of cables, and the cable with armor layer shall not be less than 12 times of the outer diameter of cables. Logarithm model the number of nominal section was conductor structure/mm diameter 20 ℃ when the conductor resistance is not greater than Ω/km
2、产品标准:GB5023.5-86《额定电压450/750V及以下聚氯乙烯绝缘电缆(电线)屏蔽电线》3、使用特性:1)额定电压U0/U为300/300V;2)电缆的长期允许工作温度:AVP-105、RVP-105型……应不超过105℃;其他型号……应不超过70℃4、型号、名称和使用范围型号名称。

聚氯乙烯电线型号、名称型号名称额定电压(V)芯数标称截面(mmIEC01(BV)一般用途单芯硬导体无护套电缆450/75011.5~IEC02(RV)一般用途单芯软导体无护套电缆450/75011.5~IEC05(BV)内部布线。
型号对数标称截面mm2导体结构根数/直径mm20℃时导体电阻不大于Ω/km适用范围本产品适用于冶金、石油、化工以及发电厂等工矿企业,在高温条件下和恶劣环境中(如酸、碱、油水低温条件)作为各种电器、仪表及自动装置之连接线,供交流额定电压450/750伏及以下控制、监控及保护电路行装场合下使用。
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。
JHS型防水电缆在长期浸水及较大的水压下,具有良好的电气绝缘性能。
防水电缆弯曲性能良好,能承受经常的移动。
用途:防水电缆供交流电压500V及以下的潜水电机上传输电能用。
万用表欧姆档来判断,当正向导通时电阻值小,用黑表笔连接的就是二极管的正极。
顺口溜叫“黑小正、红大负”。
普通二极管的检测:二极管的极性通常在管壳上注有标记,如无标记,可用万用表电阻档测量其正反向电阻来判断(一般用R×100或×1K档)普通发光二极管的检测:利用具有×10kΩ挡的指针式万用表可以大致判断发光二极管的好坏。
正常时,二极管正向电阻阻值为几十至200kΩ,反向电阻的值为∝。
如果正向电阻值为0或为∞,反向电阻值很小或为0,则易损坏。
4.工作电容:平均值52±2nF/km5.远端串音防卫度:150kHZ时指定组合的功率平均值大于69dB/km。
铠装通信电缆机械保护层:53型采用0.15mm厚的轧纹钢带,纵包于基本电缆之上,两边搭接。
分别用ZR、ZRD、ZRDW型号表示。
如编织钢丝铠装氟塑料护套表示为“94”。
4.电缆允许最小弯曲半径:非铠装、联锁或编织铠装电缆不小于电缆外径的6倍铜带屏蔽或钢丝、钢带缠绕铠装电缆不小于电缆外径的12倍5.阻燃特性:符合GB/T19666-2005标准,A类或B类。

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 largest square, tell from some cable, power cable according to the request of power grid, most commonly for five core, and control cable transmission control signal, some more, according to the standard terms of more than 61 core, but also can produce according to user requirements.
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