Rated Tensile Strength (RTS/UTS): Also called ultimate tensile strength or breaking strength, this is the calculated sum of the tensile strength of the cable's load-bearing components, typically aramid yarns or spun fibers. The actual breaking force must be at least 95% of the calculated value. RTS is critical for determining tower strength, hardware selection, and anti-vibration measures, with the maximum allowable tension (MAT) generally around 40% of RTS . Maximum Allowable Tension (MAT/MOTS): This is the tension the cable can safely withstand under design weather conditions without exceeding fiber strain limits. For stranded-layer designs, fiber strain should remain ≤0.05%, and for central-tube designs ≤0.1%, ensuring no additional optical attenuation occurs. MAT is used to calculate sag, span length, and fatigue resistance . Ultimate Operating Tension (UES): Also known as special-use tension, UES represents the maximum short-term overload the cable can tolerate during its service life. Fiber strain under UES should remain below 0.5% for central-tube and 0.35% for stranded designs. Temporary attenuation may occur, but fibers return to normal after tension release .
Central Tube Structure: Fibers are housed in a PBT or similar tube filled with water-blocking gel. Aramid yarns provide tensile strength, and an outer PE or AT sheath protects against environmental stress. This design is lightweight and reduces ice and wind loads but has limited excess fiber length . Layer-Stranded Structure: Loose tubes containing fibers are helically stranded around a central strength member (often FRP). Aramid yarns wrap the core for tensile strength, followed by a PE or AT outer sheath. This structure allows longer spans and higher tensile loads while maintaining fiber protection . Fiber Types and Core Counts: Single-mode fibers (G.652D, G.657A1/A2) are commonly used. Tube designs typically hold up to 12 fibers, with total core counts ranging from 2 to 144 depending on network requirements .
Temperature and Humidity: ADSS cables are designed to withstand a wide range of temperatures and relative humidity conditions without degradation of optical performance . Sag and Span Length: Maximum pole span length depends on cable weight, tension, and environmental loads. Typical section lengths range from 50 to 100 meters, with longer spans possible under higher tensile strength cables . Electrical Field Tolerance: PE sheaths are used for voltages ≤12 kV, and AT sheaths for voltages up to 35 kV or higher, preventing electrical tracking in high-voltage environments . Mechanical Durability: ADSS cables are tested for impact, bending, and mandrel radius compliance to ensure minimal additional attenuation (≤0.1 dB) under mechanical stress .
When selecting ADSS optical cables, it is essential to consider tensile strength, maximum allowable tension, ultimate operating tension, cable structure, fiber type, environmental tolerances, and span length. Proper understanding of these parameters ensures reliable performance, long service life, and safe installation in overhead power line applications .
Use an optical time domain reflectometer (OTDR) to conduct an opening test on the optical cable, check the attenuation
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Also known as special use tension, it refers to the maximum tension that the optical cable is subjected to when it is
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Therefore, the main parameters of ADSS cables are in line with the regulations of power overhead lines.
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This specification covers the design requirements and performance standard for the supply of optical fibre cable in the industry. It
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5. Optical Fiber Cable Characteristics 5.1 The Mechanical and Environmental Performance of the Cable 5.2 Installation Conditions
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The mechanical and environmental performance of the cable are in accordance with the following table. Unless otherwise specified,
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Explore the complete specifications of ADSS fiber optic cables, including structure details, mechanical performance,
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To ensure optimal performance and network durability, It is essential to understand the key parameters of ADSS fiber
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ADSS optical cables operate in an overhead configuration characterized by long-span, two-point support (typically
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These FlexTube® outdoor All Dielectric Self-Supported (ADSS) optical fibre cables are optimized for aerial installation and for
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