dc Resistance of Electrical Cable Conductors

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dc Resistance

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Resistance in Ohms per 1000 feet per conductor at 20°C and 25°C of solid wire and class B concentric strands copper and aluminum conductor
Conductor Size, AWG or kcmil	ANNEALED UNCOATED COPPER ANNEALED ALUMINUM								ANNEALED COATED COPPER
	Solid				Stranded Class B				Solid		Stranded Class B
	20°C		25°C*		20°C		25°C*		20°C	25°C*	20°C	25°C*
	CU	AL	CU	AL	CU	AL	CU	AL	CU	CU	CU	CU
24 22 20	25.7000 16.2000 10.1000	—... —... —...	26.2000 16.5000 10.3000	—... —... —...	—.... —.... 10.30000	—... —... —...	—.... —.... 10.50000	—... —... —...	26.8000 16.9000 10.5000	27.3000 17.2000 10.7000	—.... —.... 11.00000	—.... —.... 11.20000
19 18 16	8.0500 6.3900 4.0200	—... —... —...	8.2100 6.5100 4.1000	—... —... —...	— 6.51000 4.10000	—... —... —...	—.... 6.64000 4.18000	—... —... —...	8.3700 6.6400 4.1800	8.5300 6.7700 4.2600	—.... 6.92000 4.35000	—.... 7.05000 4.44000
14 12 10	2.5200 1.5900 0.9990	4.1400 2.6000 1.6400	2.5700 1.6200 1.0200	4.220 2.660 1.670	2.57000 1.62000 1.02000	—... 2.65000 1.67000	2.62000 1.65000 1.04000	—... 2.70000 1.70000	2.6200 1.6200 1.0400	2.6800 1.6800 1.0600	2.68000 1.68000 1.06000	2.73000 1.72000 1.08000
9 8 7	0.7920 0.6280 0.4980	1.3000 1.0300 .8170	0.8080 0.6410 0.5080	1.320 1.050 .833	0.80800 0.64100 0.51800	1.33000 1.05000 .83300	0.82400 0.65400 0.51800	1.35000 1.07000 0.85000	0.8160 0.6460 0.5130	0.8310 0.6590 0.5230	0.84000 0.66600 0.52800	0.85700 0.67900 0.53900
6 5 4	0.3950 0.3130 0.2480	.6480 .5140 .4070	0.4030 0.3190 0.2530	.661 .524 .415	0.40300 0.32000 0.25300	.66100 .52400 .41600	0.41000 0.32600 0.25900	0.67400 0.53500 0.42400	0.4070 0.3230 0.2560	0.4150 0.3290 0.2610	0.41900 0.33300 0.26400	0.42700 0.33900 0.26900
3 2 1	0.1970 0.1560 0.1240	.3230 .2560 .2030	0.2010 0.1590 0.1260	.330 .261 .207	0.20500 0.15900 0.12600	.33000 .26200 .20600	0.20500 0.16200 0.12900	0.33600 0.26700 0.21100	0.2030 0.1610 0.1280	0.2070 0.1640 0.1300	0.20900 0.16600 0.13100	0.21300 0.16900 0.13400
1/0 2/0 3/0	0.0982 0.0779 0.0618	.1610 .1280 .1010	0.1000 0.0795 0.0630	.164 .130 .103	0.10000 0.07950 0.06300	.16500 .13100 .10300	0.10200 0.08110 0.06420	0.16800 0.13300 0.10500	0.1010 0.0798 0.0633	0.1030 0.0814 0.0645	0.10400 0.08270 0.06560	0.10600 0.08430 0.06680
4/0 250 300	0.0490 —.... —....	.0803 —... —...	0.0500 —.... —....	.082 —... —...	0.05000 0.04230 0.03530	.08210 .06950 .05790	0.05090 0.04310 0.03600	0.08360 0.07080 0.05900	0.0502 —.... —....	0.0512 —.... —....	0.05150 0.04400 0.03670	0.05250 0.04490 0.03740
350 400 500	—.... —.... —....	—... —... —...	—.... —.... —....	—... —... —...	0.03020 0.02640 0.02120	.04960 .04340 .03480	0.03080 0.02700 0.02160	0.05050 0.04420 0.03540	—.... —.... —....	—.... —.... —....	0.03140 0.02720 0.02180	0.03200 0.02780 0.02220
600 750 1000	—.... —.... —....	—... —... —...	—.... —.... —....	—... —... —...	0.01760 0.01410 0.01060	.02900 .02320 .01740	0.01800 0.01440 0.01080	0.02950 0.02360 0.01770	—.... —.... —....	—.... —.... —....	0.01840 0.01450 0.01090	0.01870 0.01480 0.01110
1250 1500 1750	—.... —.... —....	—... —... —...	—.... —.... —....	—... —... —...	0.00846 0.00705 0.00604	.01390 .01160 .00992	0.00863 0.00719 0.00616	0.01420 0.01180 0.01010	—.... —.... —....	—.... —.... —....	0.00871 0.00726 0.00622	0.00888 0.00740 0.00634
2000 2500	—.... —....	—... —...	—.... —....	—... —...	0.00529 0.00427	.00869 .00702	0.00539 0.00436	0.00885 0.00715	—.... —....	—.... —....	0.00544 0.00440	0.00555 0.00448

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