Duplex overhead service drop cable is a type of aluminum conductor cable designed for delivering power from utility poles to residential or light commercial buildings. It is commonly used in overhead electrical distribution systems, where reliability, weather resistance, and cost-effectiveness are key.
Aluminum Conductor Duplex Overhead Service Drop Cable
What is Duplex Overhead Service Drop Cable?
A duplex service drop cable consists of two conductors:
One insulated conductor (typically a phase conductor)
One bare conductor (serving as a neutral and messenger wire)
The cable is self-supporting and used in single-phase service applications, typically at voltages of up to 600 volts.
Cable Construction
| Component | Description |
|---|---|
| Conductor | Stranded aluminum (AA-1350) or 6201-T81 alloy |
| Insulation | XLPE (Cross-linked Polyethylene) or HDPE (High-Density Polyethylene) on phase conductor |
| Messenger Wire | Bare aluminum or aluminum alloy, used for mechanical support and as the neutral |
| Identification | One conductor is black (insulated), the other is bare |
Key Features
Lightweight and easy to install
Corrosion-resistant aluminum construction
UV and weather resistant insulation (XLPE/HDPE)
Meets or exceeds ASTM standards (e.g., ASTM B-230, B-231, B-232, B-399, B-901)
Designed for temperatures up to 90°C (wet and dry)
Typical Applications
Residential service drops
Overhead secondary distribution
Temporary power service (such as construction sites)
Pole-to-building connections in rural or suburban settings
Voltage Rating & Standards
Voltage Rating: 600V
Standards:
ASTM B-230, B-231, B-232 (Aluminum conductors)
ICEA S-76-474 (Service drop cable)
UL 854 (if required)
Available Sizes (AWG/kcmil)
Duplex service drop cables come in various sizes, typically from 6 AWG to 4/0 AWG, depending on current-carrying capacity and span length. Common configurations:
| Conductor Size | Messenger Size | Ampacity (60°C) |
|---|---|---|
| 6 AWG | 6 AWG | ~50 Amps |
| 4 AWG | 4 AWG | ~70 Amps |
| 2 AWG | 2 AWG | ~95 Amps |
| 1/0 AWG | 1/0 AWG | ~150 Amps |
| 4/0 AWG | 4/0 AWG | ~230 Amps |
Note: Actual ampacity depends on installation conditions and local codes.
Why Choose Duplex Service Drop Cable?
Economical: Aluminum conductors are more affordable than copper.
Efficient: Suitable for long spans with low sag.
Durable: Withstands outdoor exposure, including UV rays, rain, and wind.
Proven: Used for decades in residential and rural electrification.
Installation Notes
Usually installed overhead on poles.
Must maintain safe clearances from buildings and ground.
Proper tensioning and secure anchoring are essential.
Follow NEC (National Electrical Code) and local utility requirements.
Conclusion
Duplex overhead service drop cable is a vital solution for efficient and cost-effective power distribution to homes and light-duty structures. Its lightweight design, high reliability, and standard compliance make it a go-to option for overhead installations worldwide.
If you are sourcing duplex service drop cable for your utility, project, or distribution business, contact us today for technical datasheets, pricing, and bulk orders.