1.All Aluminum Conductor (AAC)
This bare concentric-lay stranded conductor is constructed with a straight round central wire surrounded by one or more layers of helically layed wires. These wires are of aluminum 1350 and can be provided in different classes of stranding and tempers that fit best the requirements of the client.
The aluminum conductors that appear in this section are classified, regarding the class of stranding, as follows:
Class AA – For bare conductors usually used in overhead lines.
Class A – for conductors to be covered with weather-resistant materials and for bare conductors where greater flexibility is required.
Class B – For conductors to be insulated with various materials and for conductors indicated under Class A where greater flexibility is required.
Class C – For conductors where greater flexibility is required.Compact strand conductor for use in bare overhead applications or for use with weather resistant coverings or insulations is also available.
Bare AAC conductors meet or exceed the following ASTM specifications:
B-230 Aluminum Wire, 1350-H19 for Electrical Purposes
B-231 Aluminum Conductors, concentric-Lay-Stranded
B-400 Compact Round Concentric-Lay-Stranded Aluminum 1350 Conductors
2. All Aluminum Alloy Conductor (AAAC)
This bare concentric-lay-stranded conductor, made from round aluminum alloy 6201 -T81 wires,is constructed with a central core surrounded by one or more layers of helically laid wires.
It was designed to attend the needs of an economic conductor for the applications on aerial circuit that require a larger mechanical resistance than the one of an All Aluminum Conductor (AAC), and a better corrosion resistance than the one produced by the aluminum conductor steel reinforced (ACSR).
The conductors of Aluminum Alloy 6201-T81 are harder and have a better resistance to the abrasion than the conductors of aluminum 1350.
Used as bare overhead conductor for primary and secondary distribution. Designed utilizing a high strength aluminum alloy to achieve a high strength-to-weight ratio; affords better sag characteristics. Aluminum alloy gives AAAC higher resistance to corrosion than ACSR
The DC resistance at 20oC of the 6201-T81 conductors and have the standard ACSR of the same diameter are approximately the same. Conductors of the 6201 J81 alloys are harder and, therefore, have a greater resistance to abrasion than conductors of 1350-H 19-grade aluminum.
3. Aluminum Conductor, Steel Reinforced Conductor (ACSR)
This bare concentric-lay-stranded conductor is made from round aluminum 1350-H19 (extra hard) wires and round zinc-coated or aluminum-coated steel core wire(s) to be used as overhead electrical conductors.
Depending on the dimensions of the conductor, the steel core can be made of one or more wires.
Thanks to the great number of combinations that can be made between the wires of aluminum and the wires of steel, the proportions can vary among them to obtain the best relation between the mechanical resistance and the current-carrying capacity for each type of application.
Used as bare overhead transmission cable and as primary and secondary distribution cable.
ACSR offers optimal strength for line design. Variable steel core stranding enables desired strength to be achieved without sacrificing ampacity.
ACSR is a concentrically stranded conductor composed of one or more layers of hard-drawn 1350 H19 aluminum wire stranded with a high strength coated steel core. The core maybe single wire or stranded depending on the size.
The proportions of aluminum and steel can be varied to obtain the relation between current carrying capacity and mechanical strength best suited to each application.
Bare ACSR conductors meet or exceed the following ASTM specifications:
B-230 Aluminum Wire, 1350-H19 for Electrical Purposes.
B-232 Aluminum Conductors, Concentric-Lay-Stranded, Coated Steel Reinforced (ACSR)
B-341 Aluminum Coated (Aluminized) Steel Core Wire for Aluminum Conductors, Steel Reinforced (ACSR/AZ)
B-498 Zinc Coated Steel (Galvanized) Core Wire for Aluminum Conductors, Steel Reinforced(ACSR)
B-500 Zinc Coated and Aluminum Coated Stranded Steel Core for Aluminum Conductors, Steel Reinforced (ACSR).