ACSS/TW conductors are used for overhead distribution and transmission lines. They can operate at high temperatures up to 250°C without losing strength and sag less than comparable conductors. These benefits are useful for new lines, allowing for lower tower costs, less sag, and better corrosion resistance.
Trapezoidal Shaped Aluminum Conductor, Steel Supported (ACSS/TW) is a composite conductor made with wires twisted in a concentric-lay pattern. It is built with a central core of steel strands, which has two or more layers of trapezoidal-shaped 1350-O aluminum wires stranded around it. Because the aluminum is fully annealed, or soft, the steel core carries most or all of the mechanical load. The steel core wires are protected from corrosion, and options like a high-strength or an aluminum-clad steel core are available.
The conductor is available in two designs: equal area and equal diameter. The equal area design can carry the same current as a standard ACSS conductor but with a smaller diameter. The equal diameter design can carry more current than a standard ACSS conductor of the same size.
ASTM B857
|
Code Word |
Conductor Size |
Aluminum Stranding |
Steel Core Stranding (mm) |
Nominal Mass (kg/km) |
Rated Strength (kN) |
Nominal Outside Diameter (mm) |
Nominal DC Resistance at 20℃ (Ω/km) |
||||
|
No. of Aluminum Wires |
No. of Layers |
No. of Wires |
Individual Strand Wire Diameter |
GA2/ MA2 |
GA3/ MA3 |
AW2 |
|||||
|
MCM |
|||||||||||
|
Partridge |
266.8 |
18 |
2 |
7 |
2.002 |
519 |
39.59 |
43.15 |
37.36 |
14.73 |
0.2060 |
|
Oriole |
336.4 |
17 |
2 |
7 |
2.690 |
783 |
65.83 |
72.50 |
63.16 |
17.53 |
0.1625 |
|
Flicker |
477.0 |
18 |
2 |
7 |
2.388 |
911 |
57.82 |
63.16 |
55.60 |
19.81 |
0.1160 |
|
Hawk |
477.0 |
18 |
2 |
7 |
2.675 |
975 |
69.39 |
76.06 |
66.28 |
20.07 |
0.1153 |
|
Hen |
477.0 |
17 |
2 |
7 |
3.203 |
1110 |
93.41 |
100.97 |
89.40 |
21.08 |
0.1146 |
|
Parakeet |
556.5 |
18 |
2 |
7 |
2.578 |
1062 |
67.61 |
73.84 |
64.94 |
21.34 |
0.0990 |
|
Dove |
556.5 |
20 |
2 |
7 |
2.891 |
1137 |
80.95 |
88.52 |
77.84 |
21.59 |
0.0987 |
|
Rook |
636.0 |
18 |
2 |
7 |
2.756 |
1217 |
76.95 |
84.51 |
74.28 |
22.61 |
0.0867 |
|
Grosbeak |
636.0 |
20 |
2 |
7 |
3.089 |
1299 |
92.07 |
99.64 |
88.52 |
23.11 |
0.0863 |
|
Tern |
795.0 |
17 |
2 |
7 |
2.250 |
1326 |
63.16 |
67.61 |
60.05 |
24.38 |
0.0697 |
|
Puffin |
795.0 |
18 |
2 |
7 |
2.814 |
1449 |
84.07 |
91.63 |
81.40 |
24.89 |
0.0697 |
|
Condor |
795.0 |
20 |
2 |
7 |
3.081 |
1518 |
96.52 |
103.64 |
92.96 |
25.15 |
0.0693 |
|
Drake |
795.0 |
20 |
2 |
7 |
3.454 |
1623 |
115.20 |
124.54 |
108.53 |
25.65 |
0.0690 |
|
Mallard |
795.0 |
22 |
2 |
19 |
2.482 |
1836 |
152.57 |
168.58 |
146.34 |
26.67 |
0.0688 |
|
Phoenix |
954.0 |
30 |
3 |
7 |
2.126 |
1530 |
63.16 |
67.61 |
60.49 |
26.67 |
0.0587 |
|
Rail |
954.0 |
32 |
3 |
7 |
2.466 |
1598 |
74.28 |
80.06 |
72.06 |
26.92 |
0.0583 |
|
Cardinal |
954.0 |
20 |
2 |
7 |
3.376 |
1826 |
115.65 |
124.54 |
109.42 |
27.43 |
0.0577 |
|
Snowbird |
1033.5 |
30 |
3 |
7 |
2.212 |
1658 |
68.50 |
72.95 |
65.83 |
27.69 |
0.0540 |
|
Ortolan |
1033.5 |
32 |
3 |
7 |
2.565 |
1731 |
80.51 |
86.74 |
78.28 |
27.94 |
0.0540 |
|
Curlew |
1033.5 |
21 |
2 |
7 |
3.513 |
1973 |
125.43 |
134.77 |
116.09 |
28.70 |
0.0533 |
|
Avocet |
1113.0 |
30 |
3 |
7 |
2.296 |
1784 |
72.50 |
77.84 |
70.72 |
28.70 |
0.0500 |
|
Bluejay |
1113.0 |
33 |
3 |
7 |
2.664 |
1864 |
86.74 |
93.41 |
84.07 |
28.96 |
0.0500 |
|
Finch |
1113.0 |
38 |
3 |
19 |
2.189 |
2123 |
135.22 |
147.67 |
128.10 |
30.23 |
0.0497 |
|
Oxbird |
1192.5 |
30 |
3 |
7 |
2.377 |
1912 |
77.84 |
83.18 |
75.62 |
29.72 |
0.0467 |
|
Bunting |
1192.5 |
33 |
3 |
7 |
2.756 |
1997 |
92.96 |
100.08 |
90.29 |
29.97 |
0.0467 |
|
Grackle |
1192.5 |
38 |
3 |
19 |
2.266 |
2275 |
145.00 |
157.90 |
137.00 |
30.99 |
0.0467 |
|
Scissortail |
1272.0 |
30 |
3 |
7 |
2.456 |
2040 |
83.18 |
88.96 |
80.95 |
30.48 |
0.0440 |
|
Bittern |
1272.0 |
35 |
3 |
7 |
2.847 |
2131 |
99.19 |
106.75 |
96.08 |
30.99 |
0.0437 |
|
Pheasant |
1272.0 |
39 |
3 |
19 |
2.339 |
2425 |
151.68 |
165.91 |
145.89 |
32.00 |
0.0437 |
|
Dipper |
1351.5 |
35 |
3 |
7 |
2.934 |
2263 |
105.42 |
113.42 |
102.30 |
32.00 |
0.0413 |
|
Martin |
1351.5 |
39 |
3 |
19 |
2.410 |
2577 |
161.02 |
176.14 |
155.24 |
33.02 |
0.0410 |
|
Bobolink |
1431.0 |
36 |
3 |
7 |
3.020 |
2397 |
111.64 |
120.10 |
108.09 |
32.77 |
0.0390 |
|
Plover |
1431.0 |
39 |
3 |
19 |
2.482 |
2729 |
170.80 |
186.37 |
164.13 |
34.04 |
0.0387 |
|
Lapwing |
1590.0 |
36 |
3 |
7 |
3.183 |
2664 |
124.10 |
131.66 |
120.10 |
34.54 |
0.0350 |
|
Falcon |
1590.0 |
42 |
3 |
19 |
2.616 |
3033 |
189.48 |
207.28 |
182.81 |
35.81 |
0.0350 |
|
Chukar |
1780.0 |
37 |
3 |
19 |
2.220 |
3067 |
157.01 |
169.91 |
149.45 |
36.83 |
0.0313 |
|
Bluebird |
2156.0 |
64 |
4 |
19 |
2.441 |
3738 |
187.26 |
202.38 |
181.03 |
40.89 |
0.0260 |
|
Mohawk |
571.7 |
18 |
2 |
7 |
2.616 |
1092 |
69.39 |
76.06 |
66.72 |
21.59 |
0.0963 |
|
Calumet |
565.3 |
20 |
2 |
7 |
2.911 |
1155 |
81.84 |
89.85 |
78.73 |
21.84 |
0.0973 |
|
Mystic |
666.6 |
20 |
2 |
7 |
2.822 |
1274 |
80.95 |
88.52 |
77.84 |
23.11 |
0.0827 |
|
Oswego |
664.8 |
20 |
2 |
7 |
3.160 |
1359 |
96.52 |
104.08 |
92.96 |
23.62 |
0.0827 |
|
Maumee |
768.2 |
20 |
2 |
7 |
3.035 |
1469 |
93.41 |
102.30 |
89.85 |
24.89 |
0.0717 |
|
Wabash |
762.8 |
20 |
2 |
7 |
3.381 |
1558 |
110.76 |
119.21 |
104.08 |
25.15 |
0.0720 |
|
Kettle |
957.2 |
32 |
3 |
7 |
2.471 |
1604 |
74.73 |
80.51 |
72.50 |
26.92 |
0.0583 |
|
Fraser |
946.7 |
35 |
3 |
7 |
2.931 |
1696 |
93.85 |
101.86 |
90.29 |
27.43 |
0.0587 |
|
Columbia |
966.2 |
21 |
2 |
7 |
3.399 |
1845 |
117.43 |
125.88 |
110.76 |
27.69 |
0.0573 |
|
Suwannee |
959.6 |
22 |
2 |
7 |
3.792 |
1960 |
136.55 |
147.23 |
125.43 |
28.19 |
0.0573 |
|
— |
1080.0 |
20 |
2 |
7 |
2.624 |
1802 |
84.07 |
90.74 |
81.84 |
28.70 |
0.0517 |
|
Cheyenne |
1168.1 |
30 |
3 |
7 |
2.352 |
1873 |
76.51 |
81.40 |
74.28 |
29.46 |
0.0477 |
|
Genesee |
1158.0 |
33 |
3 |
7 |
2.738 |
1945 |
91.18 |
98.30 |
88.52 |
29.72 |
0.0480 |
|
Hudson |
1158.4 |
25 |
2 |
7 |
3.726 |
2214 |
138.33 |
149.01 |
127.66 |
30.48 |
0.0477 |
|
Catawba |
1272.0 |
30 |
3 |
7 |
2.456 |
2040 |
83.18 |
88.96 |
80.95 |
30.48 |
0.0440 |
|
Nelson |
1257.1 |
35 |
3 |
7 |
2.832 |
2107 |
98.30 |
105.86 |
95.19 |
30.73 |
0.0443 |
|
Yukon |
1233.6 |
38 |
3 |
19 |
2.311 |
2357 |
147.67 |
161.46 |
142.34 |
31.75 |
0.0450 |
|
Truckee |
1372.5 |
30 |
3 |
7 |
2.550 |
2201 |
89.85 |
95.63 |
87.18 |
31.75 |
0.0407 |
|
Mackenzie |
1359.7 |
36 |
3 |
7 |
2.944 |
2278 |
106.31 |
114.31 |
102.75 |
32.00 |
0.0410 |
|
Thames |
1334.6 |
39 |
3 |
19 |
2.398 |
2546 |
159.24 |
173.92 |
153.46 |
32.77 |
0.0417 |
|
St.Croix |
1467.8 |
33 |
3 |
7 |
2.644 |
2356 |
96.08 |
102.75 |
93.41 |
32.77 |
0.0380 |
|
Miramichi |
1455.3 |
36 |
3 |
7 |
3.048 |
2439 |
113.87 |
120.54 |
110.31 |
33.02 |
0.0383 |
|
Merrimack |
1433.6 |
39 |
3 |
19 |
2.484 |
2735 |
170.80 |
186.82 |
164.58 |
34.04 |
0.0387 |
|
Platte |
1569.0 |
33 |
3 |
7 |
2.728 |
2516 |
102.75 |
109.42 |
99.64 |
33.78 |
0.0357 |
|
Potomac |
1557.4 |
36 |
3 |
7 |
3.152 |
2610 |
121.43 |
128.99 |
117.87 |
34.29 |
0.0357 |
|
Rio Grande |
1533.3 |
39 |
3 |
19 |
2.570 |
2925 |
183.26 |
200.16 |
176.14 |
35.05 |
0.0363 |
|
Schuylkil |
1657.4 |
36 |
3 |
7 |
3.251 |
2777 |
129.44 |
137.44 |
125.43 |
35.31 |
0.0337 |
|
Pecos |
1622.0 |
39 |
3 |
19 |
2.703 |
3132 |
200.16 |
219.29 |
192.60 |
36.07 |
0.0340 |
|
Pee Dee |
1758.6 |
37 |
3 |
7 |
3.350 |
2946 |
137.44 |
145.89 |
130.77 |
36.32 |
0.0317 |
|
James |
1730.6 |
39 |
3 |
19 |
2.731 |
3302 |
206.39 |
225.96 |
198.83 |
37.34 |
0.0320 |
|
Athabaska |
1949.6 |
42 |
3 |
7 |
3.536 |
3269 |
152.57 |
162.35 |
141.00 |
38.10 |
0.0287 |
|
Cumberland |
1926.9 |
42 |
3 |
19 |
2.878 |
3674 |
229.52 |
250.87 |
221.07 |
39.37 |
0.0287 |
|
Powder |
2153.8 |
64 |
4 |
19 |
2.441 |
3735 |
187.26 |
202.38 |
181.03 |
40.64 |
0.0260 |
|
Santee |
2627.3 |
64 |
4 |
19 |
2.697 |
4558 |
228.18 |
247.31 |
221.07 |
44.70 |
0.0213 |
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