Common shielded cable models and features:
1. RVVP Cable
- Structure: Copper core + PVC insulation + copper wire braided shield + PVC jacket
- Application: Suitable for low-voltage instruments and monitoring systems. The shield layer can resist electromagnetic interference below 30MHz.
- Specifications: Nominal cross-sectional area 0.12-2.5mm² (refer to GB/T 5023-2008 standard).
2. KVVP Control Cable
- Structure: Multi-core twisted copper wire + split shield + overall shield + PVC jacket
- Application: Industrial automation control, shielding effectiveness >70dB (according to IEC 60502-1).
- Specifications: Common core counts range from 2 to 61, cross-sectional area 0.5-6mm².
3. Other Models
- DJYPVP: Computer cable with split shield + overall shield design, used for high-frequency signal transmission.
- SYV-75 Series: Shielded coaxial cable for video surveillance (e.g., SYV-75-5, impedance 75Ω ± 3Ω).
Detailed explanation of shielded twisted-pair cable models:
1. CAT5e SFTP (Category 5e double-shielded twisted-pair cable)
- Shielding: Aluminum foil wrap + copper wire braid double shield
- Transmission rate: 1000Mbps@100MHz (TIA/EIA-568-C.2 standard).
2. CAT6A FTP (Category 6 aluminum foil shielded twisted-pair cable)
- Shielding: Single-layer aluminum foil shield
- Performance: Supports 10Gbps@500MHz, crosstalk attenuation ≥44dB (ISO/IEC 11801:2017).
3. Industrial-grade twisted-pair cable
- Example: PROFINET cable (such as IE FC TP 4x2xAWG22), double-shielded, for Industrial Ethernet.
Shielded Computer Cable Characteristics:
1) Product Rated Voltage (U0/U): 300/500V
2) Long-Term Operating Temperature: 70°C
3) Ambient Temperature During Installation: -40°C for Fixed Installation, -15°C for Non-Fixed Installation
4) Minimum Bend Radius: Less than 6 times the cable's outer diameter for cables without armor; no less than 12 times the cable's outer diameter for cables with armor
5) Insulation resistance: No less than 2500 MΩ·km after a 1-minute stable charge test at 500V DC at 20°C
No disconnection between twisted pair shields and between twisted pair shields and the overall shield
6) The cable must withstand a 50Hz, 2000V AC voltage test for 5 minutes without breakdown between cores and between shields.
Selection Guide and FAQs
1. How to Choose a Shielding Type?
- Single-layer Aluminum Foil (FTP): Suitable for general office environments.
- Double-layer shielding (SFTP): For use in locations with strong electromagnetic interference (such as factories and substations).
2. Professional Standard References
- International standards: ISO/IEC 11801 (data transmission), IEC 60502 (power cable).
- Domestic standards: GB/T 18015 (symmetrical digital communication cable).
3. Precautions
- The shield must be grounded, otherwise it will be ineffective.
- The bending radius should be ≥ 8 times the cable's outer diameter (to avoid shield damage).
