959.6-22/7 TYPE 16 ACSS/TW/MA2/63% SUWANNEE 10600 FT

Southwire #: 61203921

Southwire's ACSS/TW is designed for overhead distribution and transmission lines. It is designed to operate continuously at elevated temperatures up to 250°C without loss of strength, it sags less under emergency electrical loadings than ACSR/TW, excellent self-damping properties, and its final sags are not affected by long-term creep of aluminum. Southwire's ACSS/TW is available in equal area and equal diameter design. The equal area design allows equal ampacity in a smaller diameter conductor when compared with a standard ACSS conductor. The equal diameter design allows more ampacity in an equal diameter conductor when compared with a standard ACSS conductor. ACSS/TW also provides many design opportunities for new line construction: i.e., reduced tower cost, decreased sag, increased self-damping properties, increased operating temperature and improved corrosion resistance.

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ACSS/TW-Aluminum Conductor, Steel Supported, Trapezoidal Shaped Aluminum Strands


Stock # 61203921 61203921
Size (AWG or kcmil) (mm2) 959.6 KCMIL 959.6 KCMIL
No. of Strands 22 22
Nom. OD (mils) (mm) 1110 28.19 mils mm
Nominal Total Weight (lbs/1000') (kgs/km) 1317 1959 lbs/1000' kgs/km

Standards & References

Southwire's ACSS/TW conductor meets or exceeds the following ASTM specifications:

  • B500 Metallic Coated Stranded Steel Core for Aluminum Conductors, Steel Reinforced.
  • B609 Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes
  • B802 Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum Conductors, Steel Reinforced.
  • B803 High-Strength Zinc-5% Aluminum-Mischmetal Alloy-Coated Steel Core Wire for Aluminum and Aluminum-Alloy Conductors, Steel Reinforced.
  • B857 Shaped Wire Compact Concentric-Lay-Stranded Aluminum Conductors, Coated-Steel Supported (ACSS/TW).


ACSS is a composite concentric-lay-stranded conductor. Steel strands form the central core of the conductor with one or more layers of 63% minimum average conductivity aluminum 1350-0 wire stranded around it. The steel core carries most or all of the mechanical load of the conductor due to the "0" (fully annealed or soft) temper aluminum. Steel core wires are protected from corrosion by Galfan® , zinc-5% aluminum-mischmetal alloy coating. High strength steel core, aluminized, and aluminum clad steel core is also available.