dc Resistance

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