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如果传输距离达不到以上数字，除了布线恶劣外，那就是电缆的问题。

FlameOnBunchedWires/Cables）

矿用通信电缆适用于煤矿管网的管道铺设，主要用于管道敷设。在缆芯中和屏蔽层的内外表面用石油膏填充或浇注处理，以防止煤矿中水分侵入。在煤矿常见的30~C一60~C的条件下，煤矿用通信电缆的机械和电气性能保持不变。用于平巷、斜巷及机电硐室做通信线以及用于平巷，竖井或斜井作主传输。

PTYA23：聚乙烯绝缘综合护套钢带铠装聚乙烯外护套铁路信号电缆。

产品介绍-矿用电缆|MHYV矿用电缆|MHYVR矿用电缆|MHYVP矿用电缆|MHY32矿用电缆|MHYVRP矿用电缆 。

MHY(HUY) 聚绝缘铝塑护层阻燃聚氯护套通信电缆

电力铁路专用电缆1、产品执行：GB9330-88（参照采用IEC227，耐电压优于IEC227），GA306-2001（阻燃型）。2、用途：本产品适用于直流和交流50HZ-60HZ下，额定电压450/750V及以下的控制、保护和测量线路。3、产品型号规格及范围：产品型号 规格范围 使用 KYV,KYVP,KYVP2 0.5-10mm2,2-61芯 此产品绝缘电阻高，防水性能强，的耐寒性，适用于弱电控制或强电磁场区。 KYV20,KYV22 0.5-10mm2,4-61芯 FYV30,KYV32 0.5-10mm2,7-61芯 KYVR 0.5-6mm2,2-61芯 KYVRP 0.5-4mm2,2-61芯 KYVP22,KYVP2-22 1.5-10mm2,4-61芯 注：型号前加“ZR”为阻燃型，适用于火灾易发生的。4、使用特性：电缆敷设温度应不低于0℃，电缆导体的长期允许工作温度为70℃。电缆允许的弯曲半径：对铠装的电缆，应不小于电缆外径的6倍。 对有铠装或铜带屏蔽结构的电缆，应不小于电缆外径的12倍。对有屏蔽层结构的软电缆，应不小于电缆外径的6倍。

it was clear to the Spanish party that Arran was the foured man, the more especially that Mary Stuart’s huand had now become King of France. But this did not suit Dudley. Early in September Lady Mary Sidney, Dudley’s sister, came to the Spanish ambassador with a wonderful story that a plot had been discovered to poison the Queen and Dudley at a dinner given by the Earl of Arundel. This, she said, had so alarmed the Queen, who had now a war with France on her hands, that she had determined to marry at once, and awaited the ambassador at Hampton Court with the offer of the Archduke, whom s

绝缘电气强度：导体之间1min 1kv不击穿 导体与屏蔽1min 3kv不击穿

铠装通信电缆标记内容有：导线直径、线对数量、电缆型号、长度、制造厂厂名代号及制造年份。

HYA53：铜芯实心聚烯烃绝缘挡潮层聚护套钢塑带铠装聚护套市内通信电缆。

ZR－YJLV22－P 阻燃型聚氯(交联聚)绝缘金属屏蔽钢带铠装聚氯护套电力电缆。

KYJVR ZR-KYJVR 铜芯交联聚绝缘聚氯护套控制软电缆 敷设在室内要求等。

矿用电缆防火性能分析：防火机理分析阻燃机理在反应的热作用下，位于凝聚相的阻燃剂分解吸热，使凝聚相内温度上升减慢，延缓了材料的热分解速度；阻燃剂受热分解后，释放出连锁反应基剂，使火焰、连锁反应的分支中断，减缓了气相反应速度；催化凝聚相热分解固相产物，焦化层或泡沫层的形成加强了这些层状硬壳阻碍热传递的作用；在热作用下，阻燃剂出现吸热性相变，物理性地凝聚相内温度升高。

-off, and, to that end, invited a few of his most intimate friends and admirers to be 109 present at the performance. The guests were assembled, and Tim was released from his pole. He made a tremendous rush for the open bar-room door dragging two stalwart Africans after him at a break-neck pace. He went direct to his old corner where he found a large tin pan filled with a milk-punch such as he had never tasted before. He emptied it in short order and then, taking it between his paws, sat up, licked the last reminiscence of the punch out of it, and in a few moments became the most comical object imaginable. In fact he was never known to be more funny. He was laughed at, poked with sticks, had his ears pulled, but all to no pure; he was too happy to be offended. He made a few efforts to stand erect and to appear sober and dignified, but ended each attempt by rolling over upon his back a helpless lump of limp intoxication.

额定电压35KV及以下交联聚绝缘电力电缆①电缆导体的长期允许工作温度：≤90℃ ②短路时（时间不超过5S）电缆的工作温度：250℃③空气中敷设

◎ 商用级-CM级（垂直Vertial Tray Flame ）　这是 UL中商用级电缆（General Pure Cable），适用为UL1581。实验规定在垂直8英尺高的支架上敷设多条试样，用规定的20KW带状喷灯（70，000BTU/Hr）20分钟。合格为火焰不可蔓延到电缆的上端并自行熄灭。UL1581和IEC60332-3C类似，只是敷设电缆根数不同。商用级电缆没有烟雾浓度规范，一般仅应用于同一楼层的水平走线，不应用于楼层的垂直布线上。