ACSS (Aluminum Conductor Steel Supported) Wire

Here's everything you need to know about ACSS wire (Aluminum Conductor Steel Supported) to make an informed purchase for your next project.

ACSS Wire Applications

Besides overhead distribution, ACSS conductors are also used for transmission lines and can operate continuously at up to 250°C while retaining maximum strength. Furthermore, ACSS sags less than ACSR conductors under electrical loadings, is self-damping when stretched during installation, and final sags aren't impacted by aluminum's long-term creep. Because of this, ACSS is ideal for:

  • Applications requiring higher currents for existing clearances and tensions
  • New line applications with high emergency loading requirements
  • New line uses where structures are economized due to reduced conductivity sag.
  • Lines with aeolian vibration

ACSS Wire Specifications

Aluminum conductor steel supported wire follows these ASTM standards:

  • B500: Metallic coated/aluminum-clad-stranded steel core for overhead electrical conductors. The specification covers galvanized (zinc-coated), zinc-aluminum-mischmetal alloy-coated, and aluminized (aluminum-coated) stranded steel core, which is inserted for aluminum conductors, steel reinforced (ACSR) applications.
  • B609: Aluminum 1350 round wire, annealed and intermediate tempers, and is meant for electrical applications such as stranding into conductors and single conductors, whether bare or insulated.
  • B802: Zinc-5% Zn-5Al-MM (aluminum-mischmetal) alloy-coated steel core wire consists of three Zn-5Al-MM coating classes for the mechanical enhancement of ACSR.
  • B803: High-strength zinc–5 % aluminum-mischmetal alloy-coated steel core wire for overhead electrical conductors.
  • B856: Concentric-lay-stranded aluminum conductors, coated steel supported (ACSS) for overhead electrical conductors.
  • B958: Extra-high-strength and ultra-high-strength class A zinc–5% aluminum-mischmetal alloy-coated steel core wire for overhead electrical conductors.


This concentric-lay-stranded conductor has steel strands that form its central core, with two or more aluminum 1350-O layers surrounding it. The "O" temper aluminum (soft or fully annealed) means this steel core carries all or most of the mechanical load.

Depending on the environment, you can protect the steel core wire from corrosion through mischmetal alloy coating, aluminum cladding, or galvanizing.

ACSS Conductor Types

The following code words represent ACSS conductor types:

Falcon, Redwing, Lark, Bittern, Tern, Junco, Bluebird, Grosbeak, Nuthatch, Peacock, Mallard, Pheasant, Ruddy, Condor, Teal, Stilt, Rail, Roadrunner, Wood Duck, Macaw, Ibis, Dove, Hawk, Joree, Oriole, Curlew, Chukar, Parrot, Kiwi, Gannet, Redbird, Brant, Mockingbird, Drake, Starling, Partridge, Plover, Snowbird, Egret, Finch, Towhee, Canvasback, Parakeet, Canary, Martin, Bobolink, Bunting, and Cuckoo.

About Peak Substation Services

Find a new level of efficiency with Peak Substation Services. We're your trusted packager for electrical and structural materials—serving utilities, industrial clients, and utility contractors across the United States.

We've been providing substation solutions since 2006, boasting a combined employee experience of 100+ years in substation design, packaging, construction, distribution, procurement, and manufacturing. We have 1000+ fulfilled packages, which makes us a go-to industry resource. We understand how valuable your time is and strive to reduce man-hours with our bill of materials.

Our itemized “take-offs” emphasize the quantities, sizes, and types of materials required for your project, pricing everything from nuts and bolts to grounding equipment. Our team takes a hands-on approach when analyzing project specifications to ensure budget accuracy. Our logistics department also issues multiple purchase orders to complete a package, requiring you to only send one.

Another area of specialty of ours is substation components. Thanks to our 15+ years in the substation equipment business, we tap into our industry connections to deliver what you need—when you need it.

Whether you're looking for new or replacement parts, we can help you procure quality transmission lines, insulators, switches, transformers, circuit breakers, connectors, capacitors, anchor materials, and other substation accessories. We also work with utility poles for both short and long-term needs.

Contact Us for ACSS Conductor Needs

Ready to fulfill project requirements with high-quality ACSS conductors? Reach out to us online, call us at (877) 324-0909, or email our office at for a quote concerning ACSS conductors. We’re located at 801 First Avenue North, Birmingham, Alabama 35203.

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