elevator traveling cable lift cable TVVBG cable

Elevator Traveling Cable Specifications
I. Product Overview
Product Name: Elevator Traveling Cable
Model: TVVB Series, TVVBG Series
Purpose: Designed specifically for elevator systems, used to connect elevator cars with elevator machine rooms, shafts and other parts to achieve power transmission, control signal transmission and data communication functions, ensuring stable, safe and efficient operation of elevators.
II. Cable Structure
Conductor:
Material: Made of high-purity oxygen-free copper wire, finely twisted with multiple strands, such as 7/0.2, 19/0.15 and other structures, to ensure excellent conductivity and flexibility, reduce signal transmission loss, and adapt to repeated bending during elevator operation.
Performance Requirements: At 20°C, the DC resistance of the conductor must comply with the corresponding national standards, and different wire core sections correspond to different resistance values. For example, the DC resistance of the conductor of a 0.75mm² wire core is not greater than 26.0Ω/km to ensure power transmission efficiency.
Insulation layer:
Material: Special mixed polyvinyl chloride (PVC) or low-smoke halogen-free polyolefin (LSZH) insulation materials are selected, which have good electrical insulation performance, mechanical strength and chemical corrosion resistance.
Performance requirements: At 70°C (PVC insulation) or 90°C (LSZH insulation), the insulation resistance is not less than 1000MΩ・km, and it can withstand AC withstand voltage values, such as 1500V/5min withstand voltage test, without breakdown or flashover, effectively preventing short circuit and leakage between conductors.
Shielding layer:
Structure: Depending on the application scenario and anti-interference requirements, aluminum foil wrapping shielding, copper mesh braided shielding or a combination of the two can be used. Aluminum foil wrapping provides effective protection against high-frequency electromagnetic interference, while copper mesh braided shielding (shielding density not less than 85%) focuses on resisting low-frequency electromagnetic interference to ensure the purity of control signals and data transmission.
Performance requirements: The shielding layer should have an attenuation capacity of 30dB – 60dB for electromagnetic interference within a specific frequency range, such as 1MHz – 1GHz, to prevent external electromagnetic signals from interfering with the elevator’s key signals and avoid elevator malfunctions.
Reinforcement:
Material: High-strength galvanized steel wire or stainless steel wire is usually used. According to the cable specifications and load requirements, the steel wire diameter is 0.5mm – 2mm, and it is centrally symmetrical or double-layered to enhance the overall tensile strength of the cable.
Performance requirements: The minimum short-term tensile strength of the cable is not less than 1000N, and the minimum long-term tensile strength is not less than 500N, to ensure that the cable does not break or damage during frequent lifting, acceleration and deceleration of the elevator, and maintain the continuity of signal and power transmission.
Sheath:
Material: Use PVC special sheath or LSZH sheath with excellent cold resistance, wear resistance, oil resistance and weather resistance. The colors are mostly gray, black or customized according to customer requirements. It has good flexibility and can resist oil, moisture, low temperature and mechanical wear in the elevator shaft.
Performance requirements: After the wear resistance test, the sheath wear does not exceed 0.5g/cm², maintains flexibility in low temperature environment (such as -20°C), has no cracking or embrittlement, meets relevant flame retardant standards, such as the single vertical combustion test requirements in GB/T 18380.3, and the flame spreads slowly during combustion, produces less smoke and harmful gases, and meets the fire safety requirements of elevators.
III. Electrical performance
Rated voltage: 300/500V or other suitable voltage levels selected according to specific application scenarios to meet the power supply requirements of elevator control systems, lighting, ventilation and other equipment.
Signal transmission performance:
For the cores that transmit control signals, such as signal lines used for elevator door machine control and operating status feedback, they should have low latency and high reliability, and the near-end crosstalk should not be greater than [specific value, such as 20dB] in the frequency range of 1MHz – 10MHz, and the attenuation should not exceed [specific value, such as 3dB/100m], to ensure that the control instructions are accurately and timely transmitted, and the elevator action response is fast and accurate.
If it contains data transmission cores (such as network cables used for elevator remote monitoring and IoT connection), it should support corresponding data transmission rates, such as 100Mbps, 1000Mbps or even higher, follow relevant standards such as Ethernet, meet the needs of elevator intelligent development, and ensure stable and efficient data transmission.
IV. Mechanical properties
Tensile strength: In addition to meeting the above-mentioned reinforcement performance requirements, the cable is in dynamic operation (normal operation of the elevator) and continuously bears tension. Its tensile strength is maintained within a safe range, and after 100 hours of continuous tensile testing, the cable structure is intact, and the changes in various performance indicators do not exceed the allowable range, such as the conductor DC resistance change does not exceed 5%, and the insulation resistance is not less than 80% of the initial value.
Bending radius: During the installation process, the minimum bending radius of the cable shall not be less than 6 times the outer diameter of the cable; in the dynamic operation of the elevator, the minimum bending radius shall not be less than 10 times the outer diameter of the cable to prevent the cable from being damaged due to excessive bending and affecting performance.
Torsion performance: After 5 million torsion tests, each torsion angle is ±90°. After the test, the cable sheath has no cracks, the conductor has no breakage, and the shielding layer and insulation layer have stable performance, such as the shielding effectiveness does not decrease by more than 5dB, and the insulation resistance is not less than 70% of the initial value, ensuring that the cable can adapt to the torsion conditions in the elevator operation.
V. Environmental characteristics
Working temperature: Applicable to the working temperature range of -15°C to 70°C, some high-performance products can reach -20°C to 80°C, and can work normally in different seasons and different heat dissipation conditions in the elevator shaft to ensure the stable operation of the elevator.
Storage temperature: In the storage temperature range of -40°C to 70°C, the cable performance is not significantly affected, which is convenient for long-term storage and standby.
Relative humidity: In an environment with a relative humidity of 5% – 95%, the cable can operate normally, and will not cause performance degradation due to humid or dry environment, such as insulation failure, sheath aging and other problems.
Radiation resistance: It has a certain ability to resist electromagnetic radiation and can withstand 50Mrad {50×10⁶cJ/Kg} of radiation. In the complex electromagnetic environment of the elevator shaft, it maintains the quality of signal transmission and reduces the impact of radiation interference.
VI. Dimensions and weight
Dimensions: Depending on the number, specifications and structure of cable cores, the outer diameter of the cable is between 8mm and 50mm, and it is round or flat. Flat cables are easy to install and lay in limited spaces such as the top of the elevator car, reducing space occupancy.
Weight: The weight per meter varies depending on the cable structure, roughly 0.1kg/m – 1kg/m. When selecting and installing the elevator, it is necessary to consider the impact of the cable’s own weight on the energy consumption and mechanical properties of the elevator.
VII. Safety and Certification
Flame retardant performance: strictly comply with relevant flame retardant standards, such as the single vertical combustion test in GB/T 18380.3 standard. The flame spread speed during combustion does not exceed 40mm/min, and the smoke toxicity meets the requirements of EN 50399, reducing the harm to elevator passengers and shaft facilities when a fire occurs.
Environmental protection requirements: The product complies with environmental protection standards such as the RoHS directive, does not contain harmful substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and their ethers, and ensures the environmental protection of the elevator use environment and subsequent recycling and treatment.
Product certification: Passed domestic and foreign authoritative certifications such as CCC certification and CE certification, proving that the product quality and performance meet the corresponding national standards and international common specifications, ensuring the safe and reliable operation of the elevator system.
VIII. Service life
Under normal use and maintenance conditions, the expected service life is not less than 20 years. The actual service life is affected by factors such as the frequency of elevator operation, shaft environment, and maintenance level. Regular maintenance and inspection will help extend the cable life and ensure the long-term stable operation of the elevator.