The communication cable is mainly used to transmit audio, analog signals of 150kHZ and below, and digital signals of 2048kbit/s and below. Under certain conditions, it can also be used to transmit digital signals above 2048 kbit/s. It is suitable for overhead or pipeline laying in the city, suburbs and local areas, and can also be buried directly.
Communication cable performance:
1. DC resistance: 20°C, 0.4mm copper wire, less than or equal to 148Ω/km, 0.5mm copper wire, less than or equal to 95Ω/km.
2. Insulation electric strength: 1min1kv between conductors does not break through the conductor and shield 1min3kv does not break down 3. Insulation resistance: Each core wire is grounded to the rest of the wire core, HYA cable is greater than 10000MΩ.km, HYAT cable is greater than 3000MΩ.km.
4. Working capacitance: average 52±2nF/km
5. Far-end crosstalk defense: When 150kHZ is specified, the average power of the specified combination is greater than 69dB/km.
How to keep communication cables:
One: Power cables, control cables, and communication cables should be laid separately in separate trenches. The cable trenches should be provided with a firewall and marked according to standards. The outer layer of cables should be fire-retardant and contain fire-retardant materials. Do not mix power cables and communication cables.
2: All the cable holes that pass through the walls, floors, and cable channels into the control room, cable mezzanine, control cabinet, instrument panel, etc.; the end of the cable corridor; the bottom entrance of the cable shaft and the upper end through the floor; Should be closed.
Three: The open cable trench is covered by a complete and sturdy cover. The cable layer and the trench should be kept clean and no debris or rubbish should be piled up. When there is an open fire nearby, measures should be taken to prevent the fire from entering the cable layer or trench.
Four: Laying the cable should avoid close to the heat source and avoid parallel or intersect with the steam pipe. In the tunnel or ditch of the hot pipe, no cable can be laid. For laying, insulation measures should be taken.
Five: In the cable trench according to the environmental characteristics of the cable and the degree of importance, to the combination of reliable operation, easy maintenance and economical and reasonable principles, where possible, the use of flame retardant cable.
VI: In strict accordance with relevant regulations, the cables that are in operation should be inspected, tested, and inspected on a regular basis. Lighting and fire-fighting facilities in the floor ditch should always be in good condition.
Seven: In the cable trench or cable well, the use of blowtorch matters needing attention:
1. Those who are unfamiliar with the use of safety precautions for torches are not allowed to use the torch.
2. Before the torch is used, it is necessary to check whether the oil cylinder leaks, whether it is blocked by the fire nozzle, whether the thread is leaking, whether the amount of oil is too large (not to exceed 3/4 of the volume of the oil cylinder), and whether the refueling screw is tightened. Otherwise, ignition is not allowed.
3. The following requirements shall be observed when using the torch:
(1) Do not spray nozzles toward people or flammable materials when lighting.
(2) The pressure in the oil cylinder must not be too high. Gas torches using kerosene or alcohol are prohibited from injecting gasoline.
(3) Work as far as possible in the air circulation area. In the vicinity of flammables and explosives and near transformers, torches or open flames are not allowed in the area where the oil switch is located.
(4) Do not place the torch on a high temperature object.
(5) Torch refueling, oil discharge, and dismantling the fire nozzle or other parts must be performed after the nozzle is cooled and decompressed.
(6) After the torch is used up, the pressure should be exhausted.
(7) When using the torch, the distance between the flame and the conductive part should not be less than the voltage of 10 kV and below: 1.5 meters, 10 kV or more: 3 meters
Communication cable performance:
1. DC resistance: 20°C, 0.4mm copper wire, less than or equal to 148Ω/km, 0.5mm copper wire, less than or equal to 95Ω/km.
2. Insulation electric strength: 1min1kv between conductors does not break through the conductor and shield 1min3kv does not break down 3. Insulation resistance: Each core wire is grounded to the rest of the wire core, HYA cable is greater than 10000MΩ.km, HYAT cable is greater than 3000MΩ.km.
4. Working capacitance: average 52±2nF/km
5. Far-end crosstalk defense: When 150kHZ is specified, the average power of the specified combination is greater than 69dB/km.
How to keep communication cables:
One: Power cables, control cables, and communication cables should be laid separately in separate trenches. The cable trenches should be provided with a firewall and marked according to standards. The outer layer of cables should be fire-retardant and contain fire-retardant materials. Do not mix power cables and communication cables.
2: All the cable holes that pass through the walls, floors, and cable channels into the control room, cable mezzanine, control cabinet, instrument panel, etc.; the end of the cable corridor; the bottom entrance of the cable shaft and the upper end through the floor; Should be closed.
Three: The open cable trench is covered by a complete and sturdy cover. The cable layer and the trench should be kept clean and no debris or rubbish should be piled up. When there is an open fire nearby, measures should be taken to prevent the fire from entering the cable layer or trench.
Four: Laying the cable should avoid close to the heat source and avoid parallel or intersect with the steam pipe. In the tunnel or ditch of the hot pipe, no cable can be laid. For laying, insulation measures should be taken.
Five: In the cable trench according to the environmental characteristics of the cable and the degree of importance, to the combination of reliable operation, easy maintenance and economical and reasonable principles, where possible, the use of flame retardant cable.
VI: In strict accordance with relevant regulations, the cables that are in operation should be inspected, tested, and inspected on a regular basis. Lighting and fire-fighting facilities in the floor ditch should always be in good condition.
Seven: In the cable trench or cable well, the use of blowtorch matters needing attention:
1. Those who are unfamiliar with the use of safety precautions for torches are not allowed to use the torch.
2. Before the torch is used, it is necessary to check whether the oil cylinder leaks, whether it is blocked by the fire nozzle, whether the thread is leaking, whether the amount of oil is too large (not to exceed 3/4 of the volume of the oil cylinder), and whether the refueling screw is tightened. Otherwise, ignition is not allowed.
3. The following requirements shall be observed when using the torch:
(1) Do not spray nozzles toward people or flammable materials when lighting.
(2) The pressure in the oil cylinder must not be too high. Gas torches using kerosene or alcohol are prohibited from injecting gasoline.
(3) Work as far as possible in the air circulation area. In the vicinity of flammables and explosives and near transformers, torches or open flames are not allowed in the area where the oil switch is located.
(4) Do not place the torch on a high temperature object.
(5) Torch refueling, oil discharge, and dismantling the fire nozzle or other parts must be performed after the nozzle is cooled and decompressed.
(6) After the torch is used up, the pressure should be exhausted.
(7) When using the torch, the distance between the flame and the conductive part should not be less than the voltage of 10 kV and below: 1.5 meters, 10 kV or more: 3 meters
Chongqing Xingjida Import and Export Trade Co., Ltd. , https://www.xjdvalve.com