ACSR/TW (Aluminum Conductor Steel-Reinforced Cable/Trapezoidal) Wire


ACSR/TW wire offers efficient use for a variety of applications, from overhead transmission to primary and secondary power distribution. ACSR/TW conductors come in two primary designs. The first design provides an equal area design of aluminum compared to standard ACSR conductor measurements. This smaller diameter conductor of equal area helps control the effects of wind and ice on the wire.

Conversely, the overall outside diameter of the second design matches that of the standard ACSR conductor sizes. By using the equal-diameter conductor, you get more ampacity than the standard ACSR conductor thanks to the increased cross-sectional area, which minimizes AC resistance.


ACSR/TW conductors match or exceed these ASTM specifications: B779 Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Steel-Reinforced (ACSR/TW).

Other ASTM standards include:

  • B230: Aluminum 1350-H19 for electrical applications
  • B498: Galvanized (zinc-coated) steel core wire for overhead conductors
  • B500: Aluminum-clad or metallic-coated stranded steel core for overhead conductors
  • B606: High-strength, galvanized (class A zinc coat) steel core wire for overhead conductors
  • B802: Zinc-aluminum-mischmetal (Zn-5Al-MM) alloy coat, steel core with three Zn-5Al-MM coating classes dedicated to mechanical reinforcement when manufacturing aluminum conductors; steel reinforced.
  • B803: Round, high-grade, zinc-aluminum-mischmetal (Zn-5Al-MM) alloy coat, steel core wire, consisting of Class A Zn-5Al-MM coat used for mechanical enhancement when manufacturing aluminum-alloy and special aluminum conductors.
  • B957: Round ultra-high-strength and extra-high-strength, Class A zinc-coated steel core for overhead conductors.
    B958: Round ultra-high-strength and extra-high-strength, Class A zinc–five percent aluminum-mischmetal alloy-coated, steel core wire for overhead conductors.


ACSR/TW occurs when aluminum 1350-H19 trapezoidal wire is concentrically stranded around a steel core. ACSR utilizes the Class A galvanized (GA2) standard wire coating. Moreover, you can get extra corrosion protection by applying grease to the core wire or complete conductor.

Although ACSR/TW is standard, the wire also comes in the following variations.

  • ACSR/NS: Non-Specular finish
  • ACSR/AW: Aluminum-clad steel core
  • ACSR/HC: High-Conductivity aluminum
  • ACSR/TW: Trapezoidal-shaped aluminum wire


Aluminum's ideal conductivity and lighter weight—coupled with steel's high tensile strength—make ACSR/TW conductors ideal for overhead distribution and transmission.

Additionally, steel strands offer mechanical reinforcement to reduce sag and support higher line tensions and longer spans. ACSR/TW conductors also stand out for their reliable performance in extreme weather.

About Peak Substation Services

Peak Substation Services is your go-to resource for all of your ACSR/TW (Aluminum Conductor Steel-Reinforced Cable/Trapezoidal Wire) needs. We provide electrical and structural packaging solutions, and have worked with industrial customers and utility contractors throughout the United States.

With 1000+ packages to our name and 100+ years of combined team experience in design, substation packaging, distribution, construction, procurement, and manufacturing, Peak Substation Services remains a trusted packager for many electrical and structural needs. Whether you want to upgrade your current electrical infrastructure or are just starting a new project, we have you covered with our ACSR/TW conductors.

Contact Us for Your ACSR/TW Wire Needs

As a packager, our role is to help you design, procure, and acquire the material by coordinating both delivery and purchase. When it comes to substation and transmission services, we handle the entire material take-off, from specifications and drawings to budgets, purchase materials, and shipping. Our Product & Component Department can also deliver high-voltage parts across the United States.

By taking advantage of our packaging services, you save on project man-hours, which reduces material costs. Packagers also maximize the purchasing experience for better vendor relationships. Ordinarily, substations require overhead line equipment to reach the job site within a certain schedule.

A packager reduces a consultant's or utility's direct involvement by issuing the necessary purchase requests to complete an order. Our bill-of-material provides customers with itemized, physical take-offs. We analyze a substation’s pre-designed drawings and specifications to determine the size, quantity, and types of material necessary for the project. Our team steps in to count and price your entire order, from nuts and bolts to the grounding material.

Ready to get your projects running with high-quality ACSR/TW conductors? Contact us online, call us at (877) 324-0909, or email our office at for a quote regarding ACSR/TW conductors. Our corporate office is located at 801 First Avenue North, Birmingham, Alabama 35203.

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