1. Implementation standards
MT818.14—1999 Flame-retardant communication cable for coal mines
Unit 3: Flame-retardant communication cable for coal mines
2. Product model name and purpose are shown in Table 1
Table 1
model name use
MHYV Polyethylene insulated polyvinyl chloride sheathed communication cable for coal mines Used for communication connections between coal mine flat lanes, inclined lanes and electromechanical chambers
MHJYV Reinforced wire core polyethylene insulated polyvinyl chloride sheathed communication cable for coal mines Used for communication connection between flat and inclined lanes with high mechanical damage in coal mines
MHYBV Polyethylene insulated galvanized steel wire braided armored polyvinyl chloride sheathed communication cable for coal mines Used for communication connection between flat and inclined lanes with higher impacts in coal mines
MHYAV Polyethylene insulated aluminum-polyethylene bonded sheathed communication cable for coal mines Communication connections for relatively humid inclined shafts and flat lanes in coal mines
MHYA32 Polyethylene insulated aluminum-polyethylene bonded sheathed steel wire armored polyvinyl chloride sheathed communication cable Used for communication connections of vertical shafts or inclined shafts in coal mines
4. The main technical performance of cables is shown in Table 7
Table 7
Serial number project Technical Indicators
1 Conductor DC resistance at 20℃ See Table 7-1
2 Intrinsic attenuation of cables See Table 7-1
3 Wire core insulation resistance at 20℃ ≥3000MΩ.km
4 Finished product AC voltage resistance test 1.5kV/1min between core-core, core-shielding, without breaking
5 Working capacitor ≤0.06μF/km
6 Crosstalk attenuation ≥70dB (500m length)
7 DC resistance difference ≤2% of ring resistance
8 inductance ≤800μH/km
9 Flame retardant performance Comply with MT 386-1995
Table 7-1
model Conductor DC resistance at 20℃ (≤Ω/km) Intrinsic attenuation (≤dB/km)
MHYV 45 1.10
MHJYV 73 1.30
MHYBV, MHYAV, MHYA32 36.7 0.95
5. Product representation method
1、煤矿用铜芯聚乙烯绝缘聚氯乙烯护套通信电缆， 规格：1×2，导体结构：7/0.28mm
表示为：MHYV 1×2×7/0.28
2、煤矿用加强型线芯聚乙烯绝缘聚氯乙烯护套通信电缆， 规格：2×2，导体结构：4/0.28mm铜线+3/0.28mm钢线 表示为：MHJYV 2×2×（4/0.28铜线+3/0.28钢线）
3、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， 规格：10×2，导体结构：1/0.8mm
表示为：MHYBV 10×2×1/0.8
4、煤矿用聚乙烯绝缘铝-聚乙烯粘结护层聚氯乙烯护套通信电缆， 规格：30×2，导体结构：1/0.8mm
表示为：MHYAV 30×2×1/0.8
5、煤矿用聚乙烯绝缘铝-聚乙烯粘结护层钢丝铠装聚氯乙烯护套通信电缆， 规格：50×2，导体结构：1/0.8mm
表示为：MHYA32 50×2×1/0.8
六、产品的工作条件
1、电缆的导体的最高额定工作温度为70℃。
2、电缆可采用埋地、穿管或架空等方式进行敷设。
3、电缆的最小弯曲半径为电缆直径的10倍。
七、电缆的吊运和保管
1、在运输过程中，不应使电缆及电缆盘受到损伤。严禁将电缆盘直接由车上推下。电缆盘不应平放运输、平放贮存。
2、请勿从高处仍下装有电缆的电缆盘或电缆圈，在运输过程中，电缆盘必须放稳，并用合适的方法固定，防止互相冲撞或翻倒。
3、运输或滚动电缆盘前，必须保证电缆盘牢固，电缆绕紧。滚动时必须顺着电缆盘上的箭头指示或电缆的缠紧方向进行。
4、电缆应集中分类存放，并应标明型号、规格、长度。电缆存放处不得积水。
5、电缆在保管期间，电缆盘及包装应完成，标志应齐全，封端应严密。当有缺陷时应及时处理。
八、电缆的安装敷设
1、电缆在放线时，张力应均匀，以免电缆扭曲，使绝缘线芯产生裂绞，导致事故发生。
2、做电缆头时，要严格按国家电力施工规范使用专用工具。
3、电缆在安装过程中一旦发现机械损伤，在条件允许的情况下，请务必对电缆进行相应的检查，以确认电缆绝缘是否损坏。
4. Before laying the cable, check should be carried out according to the following requirements:
4.1 The cable model, specifications and voltage should comply with the design.
4.2 The appearance of the cable should be free of damage, have good insulation, and the cable should pass the test.
4.3 The length of each cable should be calculated based on the design and actual path, and each cable should be arranged reasonably to reduce cable connectors.
4.4 Reliable safety measures should be taken when installing and laying cables in the live area.
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