Product Information

Specification

768.2 MCM Maumee ACSS TW Aluminum Conductor Steel Supported Trapezoidal Wire

Application:

ACSS TW (Aluminum Conductor Steel Supported Trapezoidal Wire) is an overhead conductor used for electrical power transmission. It consists of aluminum wires surrounding a steel core for added strength and durability. The trapezoidal wire configuration allows for improved current-carrying capacity and resistance to high temperatures, making it suitable for long-distance transmission lines in harsh environments. Its concentric lay stranded construction ensures optimal mechanical performance and flexibility.ACSS/TW conductors are manufactured in accordance with
the ASTM specification B857.

Also Known As:

768.2 MCM ACSS TW conductor, 768.2 MCM Aluminum conductor steel supported, 768.2 MCM Trapezoidal wire conductor, 768.2 MCM Bare concentric lay stranded wire, 768.2 MCM ACSS conductor application, 768.2 MCM High temperature transmission wire, 768.2 MCM Overhead power transmission conductor.

Construction:

• ACSS/TW, a nonhomogeneous conductor, is a trapezoidal shaped wire compact concentriclay-stranded conductor made from aluminum 1350-O wires and
round, coated steel core wire(s).
• ACSS/TW conductors with equal area or equal diameter as compared to ACSS conductors are available for overhead lines. Steel wires are coated with Class A coating of zinc – 5% aluminum mischmetal alloy. Other Classes of coatings are also available for additional protection from corrosion. Standard, High, Extra and Ultra High Strength steel are also available

Features:

ACSS conductors are preferred over ACSR conductors for
• With zinc – 5% aluminum mischmetal alloy coating on steel wires, ACSS conductors can be operated up to 250 °C.
ACSS conductors carry more current than ACSR conductors due to:
– Minimum average conductivity of 63% IACS for 1350-O aluminum wires vs. an average
conductivity of 61.2% for 1350-H19 aluminum wires in ACSR.
– ACSS conductors can be operated up to 250 °C vs. the maximum operating temperature for an ACSR conductor does not exceed 100 °C.
• ACSS conductors are prone to resist the effects of aeolian vibration due to very
little or no mechanical load on the annealed aluminum wires.
• Long term creep is not a factor when designing with ACSS conductors.
In addition, use of ACSS/TW with the equal area design allows equal ampacity in a conductor with approximately 10% smaller diameter over a standard ACSS
with same area. This smaller diameter of equal area ACSS/TW conductors helps reduce the effects of ice and wind loading on the conductor.
Alternatively, use of ACSS/ TW with equal diameter design provides a conductor in which
the aluminum area is increased by approximately 20% – 25% over a standard ACSS with
same diameter. This increase in the cross-sectional area of the conductor reduces its ac
resistance by about 15% – 20% and thus, increases its current carrying capacity by about 10%.

Specifications:

• Size: 768.2 MCM
• Type: 13
• Stranding Aluminum No. Al Wires.: 20
• Stranding Aluminum No. Al Layers: 2
• Stranding Steel No. of Wires.: 7
• Stranding Steel Diameter (In): 0.1195
• Mass lb/kft: 987
• Resistance dc 20 °C Ω/kft: 0.0222
• Resistance ac – 60 Hz 25 °C Ω/kft: 0.0229
• Resistance ac – 60 Hz 75 °C Ω/kft: 0.0273

*Data provided on this page is subject to change based on different manufacturers' variances

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