ASTM B856 Conductor Aluminium Conductor Steel Supported Conductor Acss/Tw

Construction
ACSS, a non-homogenous conductor, is a concentric-lay stranded conductor made from round aluminum 1350-O wires and round, coated steel core wire(s). 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.

Application:
ACSS conductors are preferred over ACSR conductors for specific transmission line applications:
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.

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