成缆工序变频电缆要求结构对称，成缆时必须保证绝缘线芯张力均匀，使成缆后的线芯长度尽量保持一致，否则会引起结构变化，导致电容和电感的不均匀性，影响电缆的电气性能*1*名称：充油通信电缆*2*型号：HYAT、HYAT53、HYAT23、HYAT22（防水、地埋）*3*用途：实心绝缘填充型电缆适用于本地电。
简单介绍HYA电缆色谱-HYAT电缆色谱-HYAC电缆色谱-以及计算机电缆都采用此标准电缆色谱电缆色谱的详细介绍国际布线标准电缆色谱：主色：白--红--黑--黄--紫 副色：蓝--橙--绿--棕--灰主副色按顺序两两搭配既可，如白蓝白橙白绿白棕白灰红蓝。
产品型号：TRVVP中度柔性屏蔽拖链电缆电缆结构：导体：超细精绞无氧铜丝符合VDE0295CLASS6标准绝缘：特殊混合PVC柔性绝缘线芯：两芯及以上集束绞合护层：(可选)无纺布屏蔽：无氧铜丝编织屏蔽(70%以上密度)护套：丁腈混合柔性护套颜色：黑色(RAL9005)灰色(RAL7001)橙色(RA。
In order to improve the quality of the cable, we choose high electrical insulation materials production, such as special cable 1.8/3 kv frequency conversion motor, with 10 kv crosslinked insulating materials, special cable adopts frequency conversion motor of 6/10 kv, 35 kv crosslinking insulation materials, conductive shielding, insulation shield and insulation adopts the imported materials. In the process of production, we put special emphasis on the purification of raw materials, shielding closely with extruded insulation materials, control the uniformity of the insulation eccentricity and insulation outside diameter, which can reduce the interface effect, improve the electrical cable properties.
3．电缆允许弯曲半径：电缆最小为电缆外径的12倍四：基本型号及名称表1型号产品名称YVFR丁腈绝缘和护套电力软电缆YVFRP丁腈绝缘和护套铜编织屏蔽电力软电缆备注：阻燃电缆型号前加ZR，导体线芯中铜丝可以采用镀锡。
模拟量数据采集值（PIWINT）转换为物理量（浮点数real）西门子plc通过采集通道采集到的值以整型（INT）型式保存在PIWx（PIW0）内，要换算为浮点型式的物理量需要经过以下两步。
第一步：把INT转换为DINT，不用为为什么，就是精度精度精度。
第二部：把DINT转换为REAL。
这两步都很简单，。
难点在于，把浮点数（REAL）转换为整形（INT），再通过PQW输出。
物理量（浮点数real）转换为模拟量数据输出值（PQWINT）西门子PLC以整型（INT）型式输出模拟量（PQW0），一般的物理量都是浮点数型式，要把物理量换算为模拟量输出，需要经过以下两步。
Computer cable USES: this product is widely used in electricity, metallurgy, petroleum, chemical industry, textile and other departments of detection and control in a computer system or automated devices, as well as general industrial computer. Features: rated voltage UO/U is 300/500v. Allowed working temperature does not exceed 70 ℃, laying temperature not lower than 0 ℃, allowed bending radius should not less than 12 times of cable outer structure of soft cable should be no less than eight times outside the cable, copper tape screened cable shall be less than 15 times of cable diameter. Product code and significance: dj-electronic computer cable y-polyethylene v-polyvinyl chloride R- represents multiple strands of soft core p-copper wire shielding p2-copper belt shielding P3 aluminum plastic compound
电缆导体长期工作温度应不超过70℃。
普通护套的电缆在环境温度不低于-5℃下敷设，耐塞护套为-10℃。
弯曲半径不低于电缆外径的15倍（敷设时），且适用于任何水平差的干扰国标电力电缆;配电用电力电缆。
有耐火、阻燃型、钢丝、钢带铠装型、单芯、多芯、软结构、屏蔽型、同心导体型、辐照交联电缆、低烟无卤型等。
三、型号、名称、用途型号名称主要使用范围MHYV煤矿用聚乙烯绝缘聚氯乙烯护套通信电缆用于矿场作普通信号传输，适用于固定敷设MHYBV煤矿用聚乙烯绝缘镀锌钢丝编织铠装聚氯乙烯护套通信电缆用于机械冲击较高的场合作主信号传输MHYVP煤矿用聚乙烯绝缘编织屏蔽聚氯乙烯护套通信电缆用于电场干扰。
采用对绞、对屏、总屏（或三线组绞合、组屏蔽、组屏总屏）等结构形式，具有介质损耗小，传输信号能力强、抗干扰性能好等特点，能可靠传输微弱模拟信号或数字信号，可广泛地用于发电、冶金、石油、化工、轻纺等部门的检测和控制用计算机系统或自动化仪表装置，以及一般的工业计算机用。
各种型号的产品名称如下：KVVP 铜芯聚氯乙烯绝缘和护套编织屏蔽控制电缆ZR-KVVP 铜芯聚氯乙烯绝缘和护套编织屏蔽阻燃控制电缆KVVP22 铜芯聚氯乙烯绝缘和护套钢带铠装控制电缆ZR-KVVP22 铜芯聚氯乙烯绝缘和护套钢带铠装阻燃控制电缆KVVRP 。
国家煤安证查询安标国家矿用产品安全标志中心（矿用产品安全标志办公室）根据国家安全生产监督管理总局的授权，承担矿用产品安全标志管理工作，包括受理安全标志申请，组织实施技术审查、现场评审、产品抽样检验，核发安全标志和企业持证后的监督管理。
回路缩减理想中的回路数量是1+X+Y+Z，其中主开关和照明回路无法改变——因为它们本身数量就少，再减就没有了。
Y（大功率电器）回路也无法改变——大功率电器必须使用单独回路，除非不用，否则就必须保留。
我们要减少的就是X。
（版权所有）这里采用的方法是合并较小房间——比如餐厅，就可以将其合并到相邻的客厅回路里，这样就可以减少一个回路。
类似的还有主卧卫生间，可以合并到主卧里；书房可以合并到副卧等。
合并时要注意，一定要合并相邻的两个房间，否则会在装修时浪费更多电线。
电缆敷设时温度不低于0℃。
推荐的允许弯曲半径，无铠装层的电缆，应不小于电缆外径的6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。
有屏蔽层结构的软电缆，应不小于电缆外径的6倍。
YJV电缆主要芯数有2芯、3芯、4芯、5芯、3+1、3+2、4+1、预分支电缆等，主要规格1平方到240平方（亦可单独定做）。
Computer shielded cable; Purpose: high voltage insulation with small interface constant. Use to ground, and the screen, the total screen (or three quad twisted, group screening, group screen a total screen), such as structure form, with a small dielectric loss, the transmission ability is strong, resistant performance is good wait for a characteristic, can reliable transmission weak analog or digital, can be widely used in electricity, metallurgy, petroleum, chemical, textile sites detection and control of the door or by computer automation instrumentation, and general industrial computer. Relevant technical indicators: reference BS5308 IEC189 and British second, product code 1 and code the DJ - (series code) electronic computer shielded cable Y - (insulation code) high-pressure polyethylene F - (insulation code) fluoroplastic V - (sheath code) polyvinyl chloride (R - said many strands of soft wire core P - (block code) copper mesh shielding P1 tin plated copper mesh shielding P2 copper tape screened P3 aluminum-plastic composite membrane shielding for example 1:3, product specifications order 7 (14) to 1.0 was computer shielded cable can be represented as: (1) total shielding DJYVP7 * 2 * 1.0mm2 (2) partial shielding multiple strands of soft line DJYPVR7 * 2 * 1.0mm2 (3) total shielding type DJYPVP7 * 2 * 1.0mm2 Type (1) packet shielding DJYPV3 x 3 x 0.75 was (group 2) screen a total screen DJYPVP3 x 3 x 0.75 was three, model name and use range model name using range DJYVPDJYPVDJYPVP total shielding polyvinyl chloride polyethylene insulating sheath computer cable shielding polyvinyl chloride polyethylene insulation group sheathed electronic computer cable shielding total shielding polyvinyl chloride polyethylene insulation group sheathed electronic computer cable 1, fixed for laying indoors, in cable trench or pipe 2, cable long-term working temperature: - 20 ℃ + 65 ℃, the cable laying temperature is lower than 0 ℃, the bending radius should not less than 10 times of cable diameter DJYVPR DJYPVR DJYPVRP total shielding polyvinyl chloride polyethylene insulating sheath computer with a soft cable shielding polyvinyl chloride polyethylene insulation group sheathed computer with a soft cable shielding total shielding polyvinyl chloride polyethylene insulation group with a soft cable sheath computers shows that: (1) flame retardant cable (oxygen index greater than 30) need to add code "out" in front of the model. For example, zr-djypv zr-djypvp et al. (2) armored (steel belt armored) cables need to add code "22" in the lower right corner of the model, such as: DJYPV22 djypvpppvp22, etc. The cable is mainly used for ac or dc 300V or below and can work normally when 500V or below.
严格的说，485总线必须要单点可靠接地。
单点就是整个485总线上只能是有一个点接地，不能多点接地，因为将其接地是因为要将地线（一般都是屏蔽线作地线）上的电压保持一致，防止共模干扰，如果多点接地适得其反。
试验规定，一根60cm长的试样垂直固定在前壁开通的金属箱内，火焰长度175mm的丙烷燃烧器从距试样的上部固定端450mm的位置上火焰锥和电缆以45度角接触，如果试样燃烧损坏部分距离固定端下部不超过50mm，测试通过。