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A2 (AASC) Bare Overhead Conductor Aluminum Alloy Conductor
A2 aluminum alloy conductors are extensively used for overhead distribution and transmission lines adjacent to ocean coastlines where there can be a problem of corrosion in the steel of an ACSR construction.
The aluminum alloy conductors are used in place of single layer ACSR conductors (i.e., 6 AWG to 4/0 AWG) to reduce power losses in overhead distribution and transmission lines. The inductive
effect of the ACSR’s steel core is eliminated, hence increasing the operating efficiency of the line.
Aluminum alloy conductors have a number of advantages over the use of the ACSR or all-aluminum conductors.
• Lower power losses than for equivalent single aluminum layer ACSR conductors. (The inductive effect of the steel core in the ACSR is eliminated.)
• Simpler fittings than those required for ACSR.
• Excellent corrosion resistance in environments conducive to galvanic corrosion in ACSR.
• Strength and sags approximately the same as for equivalent 6/1 and 26/7 ACSR conductors.
• Outside diameters are the same as for standard ACSR conductors, permitting interchangeability of fittings.
• Greater resistance to abrasion than that for 1350 wires in all-aluminum or ACSR conductors
Complete Conductor: A2 conductors are high strength aluminum
alloy, concentric-lay-stranded conductors. They are similar in construction and appearance to the A1 or AAC all-aluminum conductors. The conductors are manufactured in accordance with the requirements of the latest applicable issue of CAN/CSA C61089.
A2 or AASC (Aluminum Alloy Stranded Conductor) are CSA reference terms.
The A2/AASC conductors are manufactured from a heat-treated, magnesium-silicon high strength aluminum alloy.
The aluminum strands consist of a concentric stranded cable of 7, 19, 37, or more wires.
| A2 (AASC), ALUMINUM ALLOY CONDUCTOR, CONCENTRIC-LAY-STRANDED (MECHANICAL PROPERTIES) - CONDUCTOR SIZED TO HAVE DIAMETER EQUAL TO ACSR | ||||||||||
| CODE WORD | CSA DESIGNATION | CONDUCTOR SIZE kcmil | CONDUCTOR SIZE mm² | EQUIVALENT ACSR SIZE (1) | EQUIVALENT ASC SIZE (2) | STRANDING NO. X DIA. (mm) | CLASS | O.D. (mm) | NOMINAL MASS KG/KM | RATED STRENGTH kN |
| -none- | 8-A2-7 | 18.9 | 9.6 | 18.9 | 18.9 | 7x1.32 | AA | 3.96 | 26.15 | 2.92 |
| Fredericton | 13-A2-7 | 30.2 | 15.3 | #6 | #6 | 7x1.67 | AA | 5.01 | 41.86 | 4.68 |
| Whitehorse | 21-A2-7 | 48 | 24.3 | #4 | #4 | 7x2.10 | AA | 6.3 | 66.19 | 7.39 |
| Halifax | 34-A2-7 | 76.4 | 38.7 | #2 | #2 | 7x2.65 | AA | 7.95 | 105.4 | 11.8 |
| Regina | 42-A2-7 | 96.3 | 48.8 | #1 | #1 | 7x2.98 | AA | 8.94 | 133.3 | 14.9 |
| Montreal | 54-A2-7 | 121.5 | 61.6 | 1/0 | 1/0 | 7x3.35 | AA | 10.1 | 168.4 | 18.8 |
| Winnipeg | 67-A2-7 | 153.2 | 77.6 | 2/0 | 2/0 | 7x3.76 | AA | 11.3 | 212.2 | 23.7 |
| Toronto | 85-A2-7 | 193.1 | 97.9 | 3/0 | 3/0 | 7x4.22 | AA | 12.7 | 267.3 | 29.9 |
| Vancouver | 107-A2-7 | 243.5 | 123.4 | 4/0 | 4/0 | 7x4.74 | AA | 14.2 | 337.2 | 37.7 |
| Calgary | 135-A2-19 | 307.1 | 155.6 | 266.8 | 266.8 | 19x3.23 | AA | 16.2 | 426.8 | 47.5 |
| Edmonton | 170-A2-19 | 387.2 | 196.2 | 336.4 | 336.4 | 19x3.63 | AA | 18.2 | 539.1 | 60 |
| Brockville | 201-A2-19 | 457.5 | 231.8 | 397.5 | 397.5 | 19x3.94 | AA | 19.7 | 635.1 | 70.7 |
| Quebec | 242-A2-19 | 549 | 278.2 | 477 | 477 | 19x4.32 | AA | 21.6 | 763.5 | 84.9 |
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