556.5 MCM OSPREY ACSR Conductor Cable
The ACSR CAA 556.5 MCM 18/1F OSPREY conductor is a durable and efficient Aluminium Conductor Steel Reinforced (ACSR) cable, engineered to deliver consistent performance in overhead power transmission and distribution systems. With its construction of 18 hard-drawn 1350-H19 aluminium strands wrapped around a single galvanized steel wire, this conductor offers a dependable combination of lightweight conductivity and mechanical strength.
Complying with ASTM B232 standards, the OSPREY conductor is ideal for medium- to long-span installations, particularly where increased mechanical support is necessary. The steel core, available with Class A or B galvanization, enhances corrosion resistance while supporting the conductor’s tensile integrity under challenging environmental and load conditions.
Its 18/1F construction makes it particularly suited for projects where a balance of performance, durability, and cost-effectiveness is essential. It is widely used by utilities in transmission infrastructure, especially where moderate-to-high current capacity is required without compromising on mechanical reliability.
Construction
Technical Specifications
Quality Control
Application
Construction
556.5 MCM OSPERY ACSR Conductor Cable Construction
Standard
Product ASTM B232
Aluminum’s use as an electrical conductor material has grown substantially, mainly because of its superior electrical performance. However, for the majority of long-span transmission lines, aluminium conductors require supplementary mechanical support, and galvanized steel wires are usually employed as the core in ACSR for this purpose.
Aluminum’s use as an electrical conductor material has grown substantially, mainly because of its superior electrical performance. However, for the majority of long-span transmission lines, aluminium conductors require supplementary mechanical support, and galvanized steel wires are usually employed as the core in ACSR for this purpose.
Construction
ACSR is a concentrically stranded conductor constructed with one or more layers of hard-drawn 1350-H19 aluminium wires over a galvanized steel wire core. The core may be single or stranded, depending on its dimensions, and the steel wires are offered with Class A or B galvanization for corrosion resistance.
Depending on the electrical and mechanical strength requirements of transmission or distribution lines, ACSR provides an appropriate design by adjusting the number of aluminium and galvanized steel wires.
Depending on the electrical and mechanical strength requirements of transmission or distribution lines, ACSR provides an appropriate design by adjusting the number of aluminium and galvanized steel wires.
Applications
Widely utilized as bare cable for overhead power transmission, it also functions as primary and secondary bare conductors in electrical distribution lines.
Conditions for Ampacity Calculation
Conductor temperature = 75 °C;
Room temperature = 25 °C
Room temperature = 25 °C
Technical Specifications
556.5 MCM OSPREY ACSR Conductor Cable
556.5 MCM OSPERY ACSR Conductor Cable
| Construction characteristics | |
| Type of cable | Osprey |
| Type of conductor | Circular, stranded |
| Conductor material | aluminum / Steel Core |
| Conductor flexibility | Class AA |
| Conductor shape | Circular non compacted |
| Dimensional characteristics | |
| Conductor cross-section | 556.5 kcmil |
| Aluminium cross-section | 282.47 mm² |
| Conductor cross-section | 298.16 mm² |
| Number of aluminium wires | 18 |
| Diameter of aluminium wires | 4.47 mm |
| Number of steel wires | 1 |
| Diameter of steel wires | 4.47 mm |
| Diameter of steel core | 4.47 mm |
| Conductor diameter | 22.35 mm |
| Average geometric radius | 0.00867 m |
| Aluminium content | 782.7 kg/km |
| Steel content | 122.1 kg/km |
| Approximate weight | 904.8 kg/km |
| Nominal outer diameter | 22.35 mm |
| Number of cores | 1 |
| Number of round wires | 19 |
| Electrical characteristics | |
| Max. DC resistance of the conductor at 20°C | 0.1021 Ohm/km |
| Max. electric resistance AC 60Hz 75°C | 0.124 Ohm/km |
| Inductive reactance | 0.3581 Ohm/km |
| Capacitive reactance | 0.2146 MOhm.km |
| Ampacity | 710.0 A |
| Mechanical characteristics | |
| Rated breaking load (Class A) | 5360 kgf |
| Rated breaking load (Class B) | 5252 kgf |
| Hardness type | 1350-H19 |
| Usage characteristics | |
| Length | 1490 m |
| Reel net weight | 1340 kg |
| Packaging | Reel 125/100 |
Quality Control
556.5 MCM OSPREY ACSR Conductor Cable
Raw Material Test
Raw material testing for the 556.5 MCM Osprey ACSR Conductor Cable ensures compliance with ASTM B230 and B232 standards. Aluminum wires (1350-H19) are inspected for purity (>99.5%), conductivity (>61.5% IACS), and elongation (>1.5%) using spectrometry and tensile machines. Steel core wires (Class A galvanized) undergo zinc coating mass (min 259g/m²), tensile strength (1300-1450 MPa), and ductility checks via wrap and torsion tests. Samples are subjected to corrosion simulation in salt spray chambers and impurity analysis via microscopy. The structured process: incoming batch verification, random sampling, physical/mechanical testing (diameter, weight per length), chemical composition confirmation, accelerated aging trials at 150°C, and material release decision.
Process inspection
During the manufacturing of the 556.5 MCM Osprey ACSR Conductor Cable, process inspection adheres to ASTM B232. Aluminum drawing ensures wire diameter tolerance (±0.025mm) and surface smoothness with micrometers. Steel core galvanizing controls zinc thickness (80-100µm) and adhesion via stripping tests. Stranding line monitors 18/1 lay ratio, compactness, and tension balance using optical sensors. Real-time checks for ovality and strand continuity occur at multiple points. Final lubrication and spooling verify coil integrity. Key steps: pre-stranding material dryness confirmation, parameter logging (speed, tension), intermediate sampling for microscopy, defect rejection (breaks/cracks), and post-stranding dimensional verification. This multi-point oversight ensures the 556.5 MCM Osprey ACSR Conductor Cable achieves uniform stranding and optimal steel-aluminum bonding.
Finished Product
The finished 556.5 MCM Osprey ACSR Conductor Cable undergoes comprehensive testing to ASTM B232 standards. Routine tests include overall diameter (0.879 inches), weight per length (603 lbs/1000ft), and DC resistance (0.0507 Ω/1000ft at 20°C). Mechanical tests cover ultimate tensile strength (13,700 lbs) and elongation using universal machines. Electrical withstand and partial discharge checks confirm integrity. The process steps: reel sampling, preparation with grips, gradual load application to break point, timed hold for creep, post-test fracture analysis, and documentation. Additional verifications include zinc coating uniformity, lay length (300-400mm), and weather simulation (UV/ice loading).
Application
556.5 MCM Osprey ACSR Conductor Cable is ideal for overhead transmission and distribution lines in utility networks, rural electrification, and industrial power grids. Commonly used for spans up to 300m in moderate wind/ice areas, connecting substations to transformers for efficient 69-138kV service.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Wires and Cables packaging (1)
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