注：ZR-阻燃G-隔氧层NH-耐火三、生产范围型号芯数标称截面（mm2)型号芯数标称截面（mm2)额定电压（KV）额定电压（KV）0.6/10.6/16/6(6/10)8.7/10(8.7/15)26/35(26/45)CUALCUALCUA。
名称型号聚氯乙烯绝缘聚氯乙烯护套阻燃控制电缆ZRC-KVV聚氯乙烯绝缘聚氯乙烯护套高阻燃控制电缆ZRA-KVV聚氯乙烯绝缘聚氯乙烯护套钢带铠装阻燃控制电缆ZRC-KVV22聚氯乙烯绝缘聚氯乙烯护套钢带铠装高阻燃控制电缆ZRA-KVV22聚氯乙烯绝缘聚氯乙烯护套细钢丝铠装阻燃控制电缆ZRC。
产品标准：GB使用条件：电缆导休的长期允许工作温度为70℃；无铠装层的屏蔽电缆，应不小于电缆外径的6倍；有铠装或铜带屏蔽结构的屏蔽电缆，应不小于电缆外径的12倍；有屏蔽层结构的软屏蔽电缆，应小于电缆外径6倍。
四.线芯对数：1～61对kvv2芯＊0.75控制电缆kvv2芯＊1.0控制电缆kvv2芯＊1.5控制电缆kvv3芯＊0.75控制电缆kvv4芯＊0.75控制电缆kvv5芯＊0.75控制电缆kvv6芯＊0.75控制电缆kvv7芯＊0.75控制电缆kvv8芯＊0.75控制电缆kvv10芯＊0.75控制电。
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
PC级双电源切换开关：能够接通和承载，但不用于分断短路电流或过载电流，画图时一般如下，内部可以画成两个隔离开关（也有画成负荷开关的），PC级断路器前端一般加保护电器，如断路器、熔断器、带熔断器的负荷开关等等，但对于消防类负载因为要去不能断电，只能加单磁型断路器（仅短路保护）或负荷开关和隔离开关，其他非消防类负载保护电器可以随意加，且应配合火灾强切电源。
PC级因为无分断能力，所有的分断都是靠上级的保护电器，当前级失电，自动转换到另一路，不管是因为过载还是因为短路，只要上级保护电器断开失电，都会自动切换到另一个回路上。
RS485电缆传输距离以24AWG的RS-485电缆（线径为0.51mm）为例，当数据信号速率降低到90Kbit/S以下时，假定最大允许的信号损失为6dBV时，则电缆长度被限制在1200m，当数据信号速率为600Kbit/S时，采用24AWG电缆，最大电缆长度是200m，若采用19AWG电缆（线径为。
RS485 cable transmission distance: 24 awg RS - 485 cable (wire diameter of 0.51 mm), for example, when the data rate to below 90 kbit/S, assuming that allow loss of 6 DBV, the cable length is 1200 m, when the data rate of 600 kbit/S, using 24 awg cable, cable length is 200 m, if using 19 awg cable (wire diameter of 0.91 mm) cable degrees will be able to more than 200 m long; If 28AWG cable is used (line diameter is 0.32mm), the cable length can only be less than 200m.
Armored communication cable structure: 1. Basic cable: any filled and unfilled cable with single sheath or double sheath structure. 2. Armored communication cable mechanical protection layer: type 53 adopts 0.15mm thick corrugated steel belt, which is longitudinal wrapped on the basic cable and overlapped on both sides. The surface of the steel belt is coated with plastic to prevent corrosion and water intrusion. The type 23,22 has similar performance with double steel band wrapping. 3. Armored communication cable sheath: black high-molecular weight low-density polyethylene or polyvinyl chloride thin sheath. Sheath thickness may depend on the basic cable outer diameter. 4, identification and marking: cable appearance with permanent identification mark, tag, at no more than alternate 1 m intervals between 5, sheathed communication cable tag contents are: the diameter of wire, wire on the quantity, type of cable, length, factory name and year of manufacture. 6. Armored communication cable electrical characteristics: the cable meets all the electrical requirements of the basic cable. 7. Cable length: mechanically protected cable is manufactured according to the standard length of the corresponding basic cable
RVVP屏蔽电缆产品特点:1、用途：本产品适用于交流额定电压300/300V及以下电器、仪表、电子设备及自动化装置。
一：产品特点及用途本产品具有耐寒、柔软、耐磨、防油等特性，适用于交流额定电压0.6/1KV及以下具有耐寒、防油等特殊要求的移动电器用连接电缆，目前本产品已广泛应用于冶金、电力、船舶、汽车制造等行业。
云南省：昆明、曲靖、玉溪、丽江、昭通、思茅、临沧、保山。
浙江省：杭州、宁波、湖州、嘉兴、舟山、绍兴、衢州、金华、台州、温州、丽水。
安徽：合肥、宿州、淮北、阜阳、蚌埠、淮南、滁州、马鞍山、芜湖、铜陵、安庆、黄山、六安、巢湖、池州、宣城、亳州。
一般信号电缆传输的信号很小，为了避免信号受到干扰，信号电缆外面有一层屏蔽层，包裹的导体的屏蔽层，一般为导电布，编织铜网或铜泊（铝），屏蔽层需要接地，外来的干扰信号可被该层导入大地，避免干扰信号进入内层导体干扰降低传输信号的损耗。
，我们常用的2.5平方电线，它的最大载流量为I=2.5×6=15。
要计算最大承载功率，这与工作电压有关。
如果是~220V电压、纯阻性负载，其最大承载功率为P=220×15=3300(W)。
电线粗细的选取不仅要考虑最大载流量是否安全，会不会发热。
还要考滤电压降是否允许。
举两个实例，从电力机房到程控交换机机房，-48V(DC)供电，如果按电线载流量算，120mm足够，电线也不会发热，也很安全。
电缆的屏蔽要求是根据不同场合分别采用：对绞组合屏蔽、对绞组成电缆的总屏蔽、对绞组合屏蔽后总屏蔽等方法。
屏蔽材料有圆铜线，铜带、铝带/塑料复合带三种。
屏蔽对与屏蔽对具有较好的绝缘性能，电缆在使用中若屏蔽对屏蔽对之间出现电位差时，不会影响信号的传输质量。
在使用RS485接口时，对于特定的传输线路，从RS485接口到负载其数据信号传输所允许的最大电缆长度与信号传输的波特率成反比，这个长度数据主要是受信号失真及噪声等影响所影响。
理论上，通信速率在100Kbps及以下时，RS485的最长传输距离可达1200米，但在实际应用中传输的距离也因芯片及电缆的传输特性而所差异。