800-394-4804

Ampacities of Copper Alloy C11000 Busbars

Ampacities in the table below are for bus bars having an emissivity of 0.4. This was observed on samples exposed for 60 days in an industrial environment, and it is probably identical to that of bus bars in service.

Dimension, Inches

Area

Weight Per Ft
in Lbs

Amperage

DC Resistance
at 20° C
 

30° C Rise

50° C Rise

65° C Rise

Thickness x Width

Sq. In

Circ Mils
Thousands

 

Amps/
Circ Mils

Amps
Per Sq. Ft.

Microhms
Per Sq. Ft.

Skin Effect
Ratio
at 90° C

60 Hz
Ampacity
Amp*

Skin Effect
Ratio
at 90° C

60 Hz
Ampacity
Amp*

Skin Effect
Ratio
at 90° C

60 Hz
Ampacity
Amp*

1/16 x 1/2

.0312

39.7

.121

385

3209

264.0

1.00

103

1.00

136

1.00

157

1/16 x 3/4

.0469

59.7

.181

 

 

175.0

1.00

145

1.00

193

1.00

225

1/16 x 1

.0625

79.6

.241

 

 

132

1.00

187

1.00

250

1.00

285

1/16 x 1 1/2

.0938

119

.362

 

 

87.7

1.00

270

1.00

355

1.00

410

1/16 x 2

.125

159

.483

460

2760

65.8

1.01

345

1.01

460

1.01

530

1/8 x 1/2

.0625

79.6

.241

 

 

132

1.00

153

1.00

205

1.00

235

1/8 x 3/4

.0938

119

.362

 

 

87.7

1.00

215

1.00

285

1.00

325

1/8 x 1

.125

159

.483

589

2160

65.8

1.01

270

1.01

360

1.01

415

1/8 x 1 1/2

.188

239

.726

 

 

43.8

1.01

385

1.01

510

1.01

590

1/8 x 2

.250

318

.966

 

 

32.9

1.02

495

1.02

660

1.02

760

1/8 x 2 1/2

.312

397

1.21

 

 

26.4

1.02

600

1.02

800

1.02

920

1/8 x 3

.375

477

1.45

 

 

21.9

1.03

710

1.03

940

1.03

1100

1/8 x 3 1/2

.438

558

1.69

 

1849

18.8

1.04

810

1.03

1100

1.03

1250

1/8 x 4

.500

636

1.93

 

 

16.5

1.04

910

1.04

1200

1.04

1400

3/16 x 1/2

.0938

119

.362

 

 

87.7

1.00

195

1.00

260

1.00

300

3/16 x 3/4

.141

179

.545

 

 

58.4

1.01

270

1.01

360

1.01

415

3/16 x 1

.188

239

.726

702

1808

43.8

1.01

340

1.01

455

1.01

520

3/16 x 1 1/2

.281

358

1.09

 

 

29.3

1.02

480

1.02

630

1.02

730

3/16 x 2

.375

477

1.45

 

 

21.9

1.03

610

1.03

810

1.03

940

3/16 x 2 1/2

.469

597

1.81

 

 

17.5

1.04

740

1.04

980

1.03

1150

3/16 x 3

.562

715

2.17

821

1548

14.6

1.05

870

1.05

1150

1.04

1350

3/16 x 3 1/2

.656

835

2.53

 

 

12.5

1.07

990

1.06

1300

1.06

1500

3/16 x 4

.750

955

2.90

 

 

11.0

1.09

1100

1.08

1450

1.07

1700

1/4 x 1/2

.125

159

.483

 

 

65.8

1.01

240

1.01

315

1.01

360

1/4 x 3/4

.188

239

.726

746

1702

43.8

1.01

320

1.01

425

1.01

490

1/4 x 1

.250

318

.966

 

 

32.9

1.02

400

1.02

530

1.02

620

1/4 x 1 1/2

.375

477

1.45

 

 

21.9

1.03

560

1.03

740

1.03

860

1/4 x 2

.500

637

1.93

 

 

16.5

1.04

710

1.04

940

1.04

1100

1/4 x 2 1/2

.625

796

2.41

 

 

13.2

1.06

850

1.06

1150

1.06

1300

1/4 x 3

.750

955

2.90

965

1320

11.0

1.08

990

1.08

1300

1.07

1550

1/4 x 3 1/2

.875

1110

3.38

 

 

9.40

1.10

1150

1.09

1500

1.09

1750

1/4 x 4

1.00

1270

3.86

 

 

8.23

1.12

1250

1.11

1700

1.10

1950

1/4 x 5

1.25

1590

4.83

 

 

6.58

1.16

1500

1.15

2000

1.14

2350

1/4 x 6

1.50

1910

5.80

 

 

5.49

1.18

1750

1.17

2350

1.17

2700

3/8 x 3/4

.281

358

1.09

 

 

29.3

1.02

415

1.02

550

1.02

630

3/8 x 1

.375

477

1.45

 

 

21.9

1.03

510

1.03

680

1.03

790

3/8 x 1 1/2

.562

715

2.17

 

 

14.6

1.05

710

1.04

940

1.04

1100

3/8 x 2

.750

955

2.90

 

 

11.0

1.08

880

1.08

1150

1.07

1350

3/8 x 2 1/2

.938

1190

3.62

1133

1119

8.77

1.12

1050

1.10

1400

1.09

1600

3/8 x 3

1.12

1430

4.35

 

 

7.35

1.15

1200

1.14

1600

1.13

1850

3/8 x 3 1/2

1.31

1670

5.06

 

 

6.38

1.18

1350

1.16

1800

1.15

2100

3/8 x 4

1.50

1910

5.80

 

 

5.49

1.20

1500

1.19

2000

1.18

2350

3/8 x 5

1.88

2390

7.26

 

 

4.38

1.24

1800

1.23

2400

1.22

2800

3/8 x 6

2.25

2860

8.69

 

 

3.66

1.27

2100

1.26

2800

1.24

3250

1/2 x 1

.500

637

1.93

 

 

16.5

1.04

620

1.04

820

1.04

940

1/2 x 1 1/2

.750

955

2.90

1150

1107

11.0

1.08

830

1.08

1100

1.07

1250

1/2 x 2

1.00

1270

3.86

 

 

8.23

1.12

1000

1.11

1350

1.10

1550

1/2 x 2 1/2

1.25

1590

4.83

 

 

6.58

1.16

1200

1.15

1600

1.14

1850

1/2 x 3

1.50

1910

5.80

 

 

5.49

1.20

1400

1.19

1850

1.18

2150

1/2 x 3 1/2

1.75

2230

6.76

 

 

4.70

1.24

1550

1.22

2100

1.21

2400

1/2 x 4

2.00

2550

7.73

1500

850

4.11

1.26

1700

1.25

2300

1.24

2650

1/2 x 5

2.50

3180

9.66

 

 

3.29

1.32

2050

1.30

2750

1.29

3150

1/2 x 6

3.00

3820

11.6

 

 

2.74

1.36

2400

1.34

3150

1.33

3650

1/2 x 8

4.00

5090

15.5

 

 

2.06

1.42

3000

1.40

4000

1.39

4600

 *Applicable to typical in-service conditions (indoors, 40°C ambient temperature), horizontal run on edge, and free from external magnetic influences.

 

Table courtesy of Copper Development Association Inc. (www.copper.org)