Name: C7 ® Advanced Conductor - ACCS/TW/C7-TS
Brand: Southwire
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SPEC 80007

C7^® Advanced Conductor - ACCS/TW/C7-TS

Shaped Wire, Aluminum Conductor, Composite Supported

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Construction:

Core: Stranded continuous carbon fiber thermoset composite core with a protective capping layer
Stranding:Annealed aluminum (1350-O) trapezoidal shaped strands with 63% conductivity

Applications and Features:

Southwire’s C7-TS conductor is a high-temperature, low-sag (HTLS) advanced conductor designed for overhead transmission and distribution systems where increased capacity and reliability are critical. Its multi-strand carbon fiber composite core delivers near-zero thermal sag, exceptional tensile strength, and structural redundancy to eliminate single-point failures. C7-TS uses fully annealed 1350-O aluminum strands, with trapezoidal strands (TW) for reduced diameter and improved ampacity. Its crew-friendly design allows installation using conventional hardware and familiar techniques. Applications include long-span transmission corridors, thermal uprating of congested lines, and environments requiring superior corrosion resistance. Rated for a continuous operating temperature of 180°C and an emergency operating temperature of 200°C.

Download additional information here: C7^® Portfolio

Specifications:

ASTM B609 Standard Specification for Aluminum 1350 Round Wire, Annealed and Intermediate Tempers, for Electrical Purposes

ASTM B987 Standard Specification for Carbon Fiber Thermoset Polymer Matrix Composite Core (CFC) for use in Overhead Electrical Conductors

Made in America: Compliant with both Buy American and Buy America Act (BAA) requirements per 49 U.S.C. § 5323(j) and the Federal Transit Administration Buy America requirements per 49 C.F.R. part 661

Table 1 – Dimensions and Weight

Stock Number	Code Word	Cond Size	Type	Cross- Sectional Area		Layers of AL	Stranding		Diameter		Weight			RBS
		Cond Size	Type	AL	Total	Layers of AL	AL	C7 Strands	C7 Core	Overall	AL	C7 Core	Total	RBS
		kcmil	num	in²	in²	num	num	num x in	in	in	lb/1000ft	lb/1000ft	lb/1000ft	lb
TBA	Fundy/TW	203.2	43	0.1596	0.228	1	8	7 x 0.1115	0.3346	0.585	194.2	48.2	242.4	22100
TBA	Shenandoah/TW	266.8	21	0.2095	0.2533	1	8	7 x 0.0892	0.2677	0.608	255	30.9	285.8	15000
TBA	Olympic/TW	325	17	0.2553	0.299	2	20	7 x 0.0892	0.2677	0.671	309.2	30.9	340.1	15400
TBA	Wrangell/TW	336.4	17	0.2642	0.308	2	20	7 x 0.0892	0.2677	0.681	320.1	30.9	351	15500
TBA	Badlands/TW	336.4	22	0.2642	0.3218	2	20	7 x 0.1024	0.3071	0.685	320.1	40.6	360.7	19700
TBA	Andes/TW	397.5	14	0.3122	0.356	2	18	7 x 0.0892	0.2677	0.71	378.1	30.9	408.9	15900
TBA	Joshua Tree/TW	397.5	16	0.3122	0.3627	2	18	7 x 0.0958	0.2874	0.718	373.5	35.6	409.1	17900
TBA	Sequoia/TW	397.5	22	0.3122	0.3806	2	18	7 x 0.1115	0.3346	0.738	378.1	48.2	426.3	23400
TBA	Rogers/TW	477	13	0.3746	0.4251	2	18	7 x 0.0958	0.2874	0.778	447.4	35.6	483.3	18400
TBA	Yosemite/TW	477	15	0.3746	0.4322	2	18	7 x 0.1024	0.3071	0.787	453.7	40.6	494.3	20600
TBA	Capitol Reef/TW	477	23	0.3746	0.4601	2	20	7 x 0.1247	0.374	0.82	450.4	60.2	510.6	29100
TBA	Pinnacles/TW	556.5	10	0.4371	0.4809	2	16	7 x 0.0892	0.2677	0.823	522.1	30.9	553	16900
TBA	White Sands/TW	556.5	13	0.4371	0.4947	2	18	7 x 0.1024	0.3071	0.832	522.4	40.6	563	21100
TBA	Indiana Dunes/TW	556.5	16	0.4371	0.5055	2	20	7 x 0.1115	0.3346	0.847	522.9	48.2	571.1	24400
TBA	New River Gorge/TW	556.5	23	0.4371	0.5395	2	20	7 x 0.1365	0.4094	0.888	525.4	72.2	597.6	34700
TBA	Tortugas/TW	636	10	0.4995	0.55	2	20	7 x 0.0958	0.2874	0.88	596.7	35.6	632.3	19400
TBA	Yellowstone/TW	636	12	0.4995	0.5571	2	16	7 x 0.1024	0.3071	0.887	605.4	40.6	646	21600
TBA	Glacier/TW	636	15	0.4995	0.5762	2	20	7 x 0.1181	0.3543	0.905	605.2	54.1	659.2	27400
TBA	Carlsbad/TW	636	22	0.4995	0.61	2	20	7 x 0.1417	0.4252	0.937	605.2	77.8	683	36900
TBA	Congaree/TW	641.7	11	0.504	0.5616	2	16	7 x 0.1024	0.3071	0.89	610.8	40.6	651.4	21600
TBA	Vinson/TW	714	10	0.5608	0.6184	2	16	7 x 0.1024	0.3071	0.933	669.9	40.6	710.5	22100
TBA	Kilimanjaro/TW	795	7	0.6244	0.6682	2	20	7 x 0.0892	0.2677	0.962	745.1	30.9	776	18400
TBA	Alps/TW	795	9	0.6244	0.682	2	20	7 x 0.1024	0.3071	0.974	756.5	40.6	797.1	22600
TBA	Wind Cave/TW	795	12	0.6244	0.7011	2	20	7 x 0.1181	0.3543	0.99	756.5	54.1	810.5	28400
TBA	Denali/TW	795	16	0.6244	0.7268	2	20	7 x 0.1365	0.4094	1.01	747	72.2	819.2	36200
TBA	Rocky/TW	795	22	0.6244	0.7607	2	24	7 x 0.1575	0.4724	1.044	756.3	96.1	852.4	45600
TBA	Gateway Arch/TW	900	7	0.7069	0.7573	3	32	7 x 0.0958	0.2874	1.031	847.7	35.6	883.3	21000
TBA	Rainier/TW	900	13	0.7069	0.7997	2	20	7 x 0.1299	0.3898	1.056	844.8	65.4	910.2	34000
TBA	Mauna Kea/TW	900	21	0.7069	0.8548	2	20	7 x 0.1640	0.4921	1.1	856.4	104.3	960.7	49700
TBA	Crater Lake/TW	954	7	0.7493	0.7997	3	34	7 x 0.0958	0.2874	1.058	898.6	35.6	934.1	21300
TBA	Grand Canyon/TW	954	10	0.7493	0.826	3	34	7 x 0.1181	0.3543	1.072	899.4	54.1	953.5	29300
TBA	Fuji/TW	954	12	0.7493	0.8421	2	20	7 x 0.1299	0.3898	1.077	907.8	65.4	973.2	34300
TBA	Jasper/TW	954	16	0.7493	0.868	2	22	7 x 0.1470	0.4409	1.104	896.4	83.7	980.1	41400
TBA	Arches/TW	954	20	0.7493	0.8972	2	20	7 x 0.1640	0.4921	1.126	907.8	104.3	1012	50100
TBA	Everglades/TW	973.1	14	0.7643	0.8747	2	20	7 x 0.1417	0.4252	1.108	925.9	77.8	1003.8	39000
TBA	Big Bend/TW	1033.5	5	0.8117	0.8555	3	34	7 x 0.0892	0.2677	1.093	972.5	30.9	1003.4	19800
TBA	Lassen/TW	1033.5	7	0.8117	0.8693	3	34	7 x 0.1024	0.3071	1.103	973.4	40.6	1014	24000
TBA	Tahoe/TW	1033.5	11	0.8117	0.8972	3	34	7 x 0.1247	0.374	1.118	980.9	60.2	1041.2	32500
TBA	Samoa/TW	1033.5	13	0.8117	0.9141	2	22	7 x 0.1365	0.4094	1.13	970.1	72.2	1042.3	37800
TBA	Ocala/TW	1033.5	16	0.8117	0.9391	2	20	7 x 0.1522	0.4567	1.15	971.1	89.8	1060.9	44500
TBA	Cook/TW	1113	5	0.8741	0.9179	3	30	7 x 0.0892	0.2677	1.125	1047.3	30.9	1078.2	20200
TBA	Blanc/TW	1113	7	0.8741	0.9318	3	34	7 x 0.1024	0.3071	1.139	1048.3	40.6	1088.9	24500
TBA	Niagara/TW	1113	10	0.8741	0.9596	3	34	7 x 0.1247	0.374	1.155	1049.3	60.2	1109.6	32900
TBA	Gannett/TW	1113	13	0.8741	0.9846	3	38	7 x 0.1417	0.4252	1.181	1050.9	77.8	1128.7	39800
TBA	Washington/TW	1192.5	5	0.9366	0.9804	3	34	7 x 0.0892	0.2677	1.166	1122.1	30.9	1153	20700
TBA	Elbert/TW	1192.5	7	0.9366	1.005	3	34	7 x 0.1115	0.3346	1.184	1123.2	48.2	1171.4	28200
TBA	Kings Canyon/TW	1192.5	10	0.9366	1.0294	3	34	7 x 0.1299	0.3898	1.203	1124.3	65.4	1189.7	35700
TBA	Acadia/TW	1192.5	13	0.9366	1.0554	3	38	7 x 0.1470	0.4409	1.223	1125.9	83.7	1209.7	42700
TBA	Redwood/TW	1233.6	7	0.9689	1.0373	3	36	7 x 0.1115	0.3346	1.207	1161.9	48.2	1210.1	28500
TBA	Mesa Verde/TW	1233.6	10	0.9689	1.0617	3	38	7 x 0.1299	0.3898	1.221	1163	65.4	1228.5	35900
TBA	Biscayne/TW	1233.6	13	0.9689	1.0963	3	36	7 x 0.1522	0.4567	1.245	1164.7	89.8	1254.5	45600
TBA	Saguaro/TW	1272	5	0.999	1.0495	3	38	7 x 0.0958	0.2874	1.211	1196.9	35.6	1232.5	23300
TBA	Sierra Nevada/TW	1272	7	0.999	1.0674	3	38	7 x 0.1115	0.3346	1.224	1198.1	48.2	1246.3	28700
TBA	Eldorado/TW	1272	10	0.999	1.1014	3	38	7 x 0.1365	0.4094	1.244	1199.3	72.2	1271.4	39100
TBA	Voyageurs/TW	1272	13	0.999	1.1264	3	39	7 x 0.1522	0.4567	1.259	1201	89.8	1290.8	45800
TBA	Cascades/TW	1351.5	7	1.0615	1.1382	3	38	7 x 0.1181	0.3543	1.264	1273	54.1	1327	31800
TBA	Banff/TW	1351.5	10	1.0615	1.1639	3	42	7 x 0.1365	0.4094	1.278	1274.2	72.2	1346.4	39600
TBA	Elbrus/TW	1351.5	13	1.0615	1.1978	3	42	7 x 0.1575	0.4724	1.299	1276.1	96.1	1372.2	49000
TBA	Kings Peak/TW	1431	7	1.1239	1.2006	3	36	7 x 0.1181	0.3543	1.292	1347.8	54.1	1401.9	32300
TBA	Wheeler/TW	1431	10	1.1239	1.2343	3	36	7 x 0.1417	0.4252	1.309	1349.2	77.8	1427	41700
TBA	Granite/TW	1431	13	1.1239	1.2718	3	36	7 x 0.1640	0.4921	1.341	1351.1	104.3	1455.4	52900
TBA	Borah/TW	1510.5	7	1.1863	1.2718	3	36	7 x 0.1247	0.374	1.33	1422.7	60.2	1483	35400
TBA	Boundary/TW	1510.5	10	1.1863	1.3051	3	36	7 x 0.1470	0.4409	1.347	1424.1	83.7	1507.8	44700
TBA	Whitney/TW	1510.5	12	1.1863	1.3343	3	36	7 x 0.1640	0.4921	1.374	1434.2	104.3	1538.5	53400
TBA	Bryce Canyon/TW	1590	7	1.2488	1.3342	3	36	7 x 0.1247	0.374	1.357	1497.6	60.2	1557.8	35900
TBA	Adirondack/TW	1590	10	1.2488	1.3762	3	38	7 x 0.1522	0.4567	1.386	1499.1	89.8	1588.9	47800
TBA	Zion/TW	1590	12	1.2488	1.3967	3	42	7 x 0.1640	0.4921	1.405	1509.4	104.3	1613.7	53900
TBA	Teton/TW	1780	5	1.398	1.4747	3	38	7 x 0.1181	0.3543	1.422	1674.9	54.1	1729	34400
TBA	Everest/TW	1780	8	1.398	1.5084	3	38	7 x 0.1417	0.4252	1.441	1674.1	77.8	1751.9	43900
TBA	Katmai/TW	1780	10	1.398	1.5344	3	36	7 x 0.1575	0.4724	1.46	1678.2	96.1	1774.3	51600
TBA	Great Basin/TW	1949	7	1.5307	1.6332	3	36	7 x 0.1365	0.4094	1.5	1835.7	72.2	1907.9	43300

All dimensions are nominal and subject to normal manufacturing tolerances.
The final design of a TW conductor is contingent upon several factors such as: layer diameter, wire width, and wire thickness. This may result in a slight variation in the number of wires, number of layers, and outside diameter from that shown in the table.

Table 2 – Electrical

Stock Number	Code Word	Conductor Size	DC Resistance	AC Resistance @ 60Hz			GMR	Reactance @ 1ft Spacing 60Hz		Ampacity^†
		Conductor Size	@ 20°C	@ 25°C	@ 180°C	@ 200°C	GMR	Inductive X_a	Capacitive X'_a	@ 180°C	@ 200°C
		kcmil	Ω/mile	Ω/mile	Ω/mile	Ω/mile	ft	Ω/mile	MΩ-mile	amp	amp
TBA	Fundy/TW	203.2	0.4445	0.4539	0.7402	0.7771	0.0205	0.4719	0.1102	644	677
TBA	Shenandoah/TW	266.8	0.3387	0.3461	0.5642	0.5924	0.0204	0.4724	0.109	746	784
TBA	Olympic/TW	325	0.2769	0.2831	0.4614	0.4844	0.0231	0.4572	0.1061	851	894
TBA	Wrangell/TW	336.4	0.2675	0.2736	0.4458	0.468	0.0234	0.4558	0.1057	869	914
TBA	Badlands/TW	336.4	0.2675	0.2735	0.4456	0.4679	0.0239	0.453	0.1055	871	916
TBA	Andes/TW	397.5	0.2263	0.2317	0.3772	0.396	0.0238	0.4537	0.1044	957	1006
TBA	Joshua Tree/TW	397.5	0.2235	0.2288	0.3726	0.3912	0.0243	0.4513	0.1041	966	1016
TBA	Sequoia/TW	397.5	0.2262	0.2315	0.3771	0.3958	0.0254	0.4457	0.1033	969	1019
TBA	Rogers/TW	477	0.1861	0.1908	0.3104	0.3259	0.026	0.4429	0.1017	1085	1141
TBA	Yosemite/TW	477	0.1886	0.1933	0.3145	0.3301	0.0265	0.4406	0.1014	1082	1138
TBA	Capitol Reef/TW	477	0.1872	0.1917	0.312	0.3276	0.0287	0.4308	0.1002	1100	1157
TBA	Pinnacles/TW	556.5	0.1594	0.1639	0.2662	0.2795	0.0274	0.4366	0.1	1192	1255
TBA	White Sands/TW	556.5	0.1595	0.1638	0.2663	0.2795	0.0278	0.4348	0.0997	1196	1259
TBA	Indiana Dunes/TW	556.5	0.1597	0.1639	0.2664	0.2797	0.0291	0.4293	0.0992	1202	1265
TBA	New River Gorge/TW	556.5	0.1604	0.1645	0.2676	0.2809	0.0311	0.421	0.0978	1217	1282
TBA	Tortugas/TW	636	0.1395	0.1437	0.2331	0.2447	0.0295	0.4276	0.0981	1300	1369
TBA	Yellowstone/TW	636	0.1415	0.1457	0.2364	0.2482	0.0297	0.4268	0.0978	1294	1363
TBA	Glacier/TW	636	0.1415	0.1455	0.2362	0.248	0.031	0.4214	0.0972	1303	1372
TBA	Carlsbad/TW	636	0.1415	0.1452	0.2361	0.2478	0.0328	0.4147	0.0962	1318	1388
TBA	Congaree/TW	641.7	0.1403	0.1444	0.2344	0.246	0.0298	0.4264	0.0977	1302	1371
TBA	Vinson/TW	714	0.1243	0.1283	0.2078	0.2181	0.0311	0.4213	0.0963	1403	1477
TBA	Kilimanjaro/TW	795	0.1115	0.1156	0.1868	0.1961	0.0316	0.4191	0.0954	1493	1574
TBA	Alps/TW	795	0.1132	0.1172	0.1895	0.1989	0.0325	0.4158	0.095	1489	1568
TBA	Wind Cave/TW	795	0.1132	0.117	0.1894	0.1988	0.0335	0.4119	0.0946	1497	1577
TBA	Denali/TW	795	0.1118	0.1153	0.1869	0.1961	0.0348	0.4075	0.094	1516	1598
TBA	Rocky/TW	795	0.1132	0.1165	0.1891	0.1984	0.0367	0.401	0.093	1523	1605
TBA	Gateway Arch/TW	900	0.099	0.1031	0.1661	0.1743	0.0337	0.4113	0.0934	1619	1706
TBA	Rainier/TW	900	0.0986	0.1023	0.1652	0.1734	0.0359	0.4036	0.0927	1635	1724
TBA	Mauna Kea/TW	900	0.1	0.1032	0.1672	0.1755	0.0384	0.3955	0.0914	1647	1736
TBA	Crater Lake/TW	954	0.0934	0.0975	0.1569	0.1646	0.0343	0.4091	0.0926	1679	1770
TBA	Grand Canyon/TW	954	0.0935	0.0973	0.1568	0.1645	0.0356	0.4047	0.0922	1686	1778
TBA	Fuji/TW	954	0.0943	0.098	0.1581	0.1659	0.0365	0.4015	0.0921	1682	1773
TBA	Jasper/TW	954	0.0931	0.0966	0.156	0.1637	0.0376	0.3983	0.0913	1706	1799
TBA	Arches/TW	954	0.0943	0.0976	0.1579	0.1657	0.0393	0.3928	0.0907	1707	1800
TBA	Everglades/TW	973.1	0.0925	0.096	0.155	0.1626	0.0379	0.3971	0.0912	1714	1808
TBA	Big Bend/TW	1033.5	0.0861	0.0904	0.145	0.1521	0.0351	0.4064	0.0916	1765	1861
TBA	Lassen/TW	1033.5	0.0862	0.0903	0.145	0.1521	0.0359	0.4037	0.0914	1770	1866
TBA	Tahoe/TW	1033.5	0.0869	0.0907	0.1459	0.153	0.0372	0.3995	0.091	1772	1869
TBA	Samoa/TW	1033.5	0.0859	0.0895	0.1442	0.1513	0.0378	0.3973	0.0906	1788	1886
TBA	Ocala/TW	1033.5	0.086	0.0894	0.1442	0.1513	0.0395	0.3921	0.0901	1798	1897
TBA	Cook/TW	1113	0.08	0.0844	0.1349	0.1415	0.0355	0.4051	0.0908	1846	1948
TBA	Blanc/TW	1113	0.08	0.0843	0.1349	0.1415	0.037	0.4002	0.0904	1854	1955
TBA	Niagara/TW	1113	0.0801	0.084	0.1348	0.1414	0.0383	0.396	0.09	1862	1965
TBA	Gannett/TW	1113	0.0802	0.0839	0.1348	0.1415	0.04	0.3907	0.0893	1875	1978
TBA	Washington/TW	1192.5	0.0746	0.0792	0.1262	0.1323	0.0372	0.3994	0.0897	1931	2037
TBA	Elbert/TW	1192.5	0.0747	0.0789	0.1261	0.1322	0.0386	0.3949	0.0893	1941	2048
TBA	Kings Canyon/TW	1192.5	0.0748	0.0787	0.126	0.1321	0.0398	0.391	0.0888	1951	2059
TBA	Acadia/TW	1192.5	0.0749	0.0786	0.126	0.1322	0.0414	0.3865	0.0883	1962	2070
TBA	Redwood/TW	1233.6	0.0722	0.0765	0.122	0.1279	0.0399	0.391	0.0887	1985	2095
TBA	Mesa Verde/TW	1233.6	0.0723	0.0763	0.1219	0.1279	0.0407	0.3886	0.0883	1993	2104
TBA	Biscayne/TW	1233.6	0.0724	0.076	0.1219	0.1278	0.0424	0.3834	0.0878	2006	2117
TBA	Saguaro/TW	1272	0.07	0.0745	0.1185	0.1242	0.039	0.3938	0.0886	2017	2129
TBA	Sierra Nevada/TW	1272	0.07	0.0744	0.1184	0.1242	0.04	0.3906	0.0883	2024	2136
TBA	Eldorado/TW	1272	0.0701	0.074	0.1183	0.124	0.0416	0.3859	0.0878	2036	2149
TBA	Voyageurs/TW	1272	0.0702	0.0739	0.1183	0.1241	0.0429	0.382	0.0874	2043	2157
TBA	Cascades/TW	1351.5	0.0659	0.0703	0.1116	0.117	0.0414	0.3863	0.0873	2106	2224
TBA	Banff/TW	1351.5	0.066	0.07	0.1116	0.117	0.0429	0.382	0.087	2114	2232
TBA	Elbrus/TW	1351.5	0.0661	0.0698	0.1115	0.1169	0.0443	0.3781	0.0865	2126	2244
TBA	Kings Peak/TW	1431	0.0623	0.0668	0.1057	0.1108	0.0426	0.3828	0.0867	2180	2302
TBA	Wheeler/TW	1431	0.0623	0.0664	0.1055	0.1106	0.044	0.379	0.0863	2191	2313
TBA	Granite/TW	1431	0.0624	0.0662	0.1055	0.1106	0.0457	0.3744	0.0856	2208	2332
TBA	Borah/TW	1510.5	0.059	0.0635	0.1003	0.1051	0.044	0.379	0.0858	2258	2386
TBA	Boundary/TW	1510.5	0.059	0.0632	0.1001	0.105	0.0453	0.3754	0.0854	2269	2397
TBA	Whitney/TW	1510.5	0.0594	0.0634	0.1007	0.1055	0.0467	0.3718	0.0848	2278	2406
TBA	Bryce Canyon/TW	1590	0.056	0.0607	0.0955	0.1001	0.0437	0.3799	0.0852	2329	2461
TBA	Adirondack/TW	1590	0.0561	0.0603	0.0953	0.0999	0.0463	0.3727	0.0846	2348	2480
TBA	Zion/TW	1590	0.0565	0.0605	0.0958	0.1004	0.0477	0.3692	0.0842	2352	2485
TBA	Teton/TW	1780	0.05	0.0552	0.0859	0.0899	0.046	0.3737	0.0838	2493	2636
TBA	Everest/TW	1780	0.05	0.0547	0.0856	0.0896	0.0475	0.3697	0.0834	2509	2652
TBA	Katmai/TW	1780	0.0501	0.0546	0.0856	0.0897	0.049	0.3659	0.083	2519	2663
TBA	Great Basin/TW	1949	0.0457	0.0509	0.0788	0.0825	0.0495	0.3648	0.0822	2648	2801

Resistance and ampacity based on an aluminum conductivity of 63% IACS at 20°C.
† Ampacity based on 25°C ambient temperature, 2 ft/s perpendicular wind, 0.5 emissivity, 0.5 absorptivity, 60 Hz, clear atmosphere, sea level, 30° N. latitude, N-S line azimuth, noon on June 10th.

Revision: 1.000.058

Updated On: Dec. 11, 2025, 7:32 p.m. UTC

C7® Advanced Conductor - ACCS/TW/C7-TS

Shaped Wire, Aluminum Conductor, Composite Supported

Construction:

Applications and Features:

Specifications:

C7^® Advanced Conductor - ACCS/TW/C7-TS