Busbar Design Considerations

8/12/2019 Busbar Design Considerations

1/26

Required Ampacity*

100-149

150-199

200-249

250-299

300-349

450-499

500-599

350-399

400-449


2/26

800-899

600-699

700-799

900-999

1000-1249

1250-1499


3/26

* For 60 Hz current.

** Table gives busbar cross section which will probably b

selected has the necessary ampacity. Example: Assu

2500-2999

1500-1749

1750-1999

2000-2499


4/26

30 C Rise1/16 x 1/2

1/16 x 3/4

1/16 x 1

1/8 x 1/2

3/16 x 1/2

1/8 x 3/4

1/4 x 1/2

1/16 x 1 1/2

1/8 x 1

3/16 x 3/4

1/16 x 2

3/16 x 1

1/4 x 3/4

1/4 x 1

3/8 x 3/4

1/8 x 2

3/16 x 1 1/2

1/4 x 1 1/2

3/8 x 1

Table 2 - Quick Bus

Busbar Design

1/8 x 1 1/2


5/26

1/8 x 2 1/2

3/16 x 2

1/2 x 1

1/8 x 3

3/16 x 2 1/2

1/4 x 2

3/8 1 1/2

1/8 x 3 1/2

3/16 x 3

1/4 x 2 1/2

3/8 x 2

3/16 x 3 1/2

1/4 x 3

3/16 x 4

1/4 x 3 1/2

3/8 x 2 1/2

3/8 x 3

1/2 x 2

1/2 x 2 1/2

1/4 x 4

3/8 x 3 1/2

1/2 x 3

1/4 x 5

3/8 x 4


6/26

1/2 x 3 1/2

1/2 x 4

1/4 x 6

3/8 x 5

1/4 x 8

3/8 x 6

1/2 x 5

1/2 x 6

1/4 x 10

3/8 x 8

e large enough for Ampacities within each range. Knowi

me that required ampacity is 185 amps at 30 C rise. T

ampacity of 1/6 x 1 in


7/26

50 C Rise

1/16 x 1

1/8 x 3/4

3/16 x 1/2

1/8 x 1

3/16 x 3/4

1/16 x 2

3/16 x 1

1/8 x 1 1/2

1/4 x 1

3/8 x 3/4

Busbar Dimension, Inches**

1/16 x 1/2

1/16 x 3/4

1/8 x 1/2

1/4 x 1/2

bar Design Selector

Considerations

1/4 x 3/4


8/26

1/8 x 2

3/16 x 1 1/2

3/8 x 1

1/8 x 2 1/2

3/16 x 2

1/2 x 1

3/16 x 2 1/2

1/4 x 2

3/8 x 1 1/2

1/8 x 4

3/16 x 3

1/4 x 2 1/2

3/8 x 2

3/16 x 3 1/2

3/16 x 4

1/4 x 3

3/8 x 2 1/2

1/2 x 2

1/4 x 3 1/2

1/4 x 4

1/4 x 1 1/2


9/26

3/8 x 3

1/2 x 2 1/2

3/8 x 3 1/2

1/2 x 3

1/4 x 6

3/8 x 5

1/2 x 4

3/8 x 6

1/2 x 5

g required ampacity, determine possible busbar dimensi

ble 2 indicates that 1/16 x 1 in. size would probably be a

. busbar as 187 amps.


10/26

65 C Rise

1/16 x 3/4

1/8 x 1/2

1/8 x 3/4

3/16 x 1/2

1/16 x 1 1/2

1/8 x 1

3/16 x 3/4

1/16 x 2

1/8 x 1 1/2

3/16 x 1

1/16 x 1/2

1/16 x 1

1/4 x 3/4

1/4 x 1/2


11/26

1/4 x 1

3/8 x 3/4

1/8 x 2

3/16 x 1 1/2

3/8 x 1

3/16 x 2

1/2 x1

1/8 x 3

3/16 x 2 1/2

1/4 x 2

3/8 x 1 1/2

1/8 x 4

3/16 x 3

1/4 2 1/2

3/8 x 2

3/16 x 3 1/2

3/16 x 4

1/4 x 1 1/2


12/26

1/4 x 3

3/8 x 2 1/2

1/2 x 2

1/4 x 3 1/2

1/4 x 4

3/8 x 3

1/2 x 2 1/2

1/4 x 5

3/8 x 4

1/2 x 3 1/2

1/4 x 6

3/8 x 5

1/2 x 4

ns from the table. Then check Table 1 to verify that size

dequate. This is confirmed by Table 1 which lists the


13/26

Electrical Bus Bar Ampacity

TABLE 1. AMPACITIES OF COPPER BUSBARS


14/26

Dimension, In.Weight Per Ft in

Lb.

DC Resistance

at 20 C,

Microhms/Ft.

Area 30 C Rise


15/26

Sq. InCirc Mils

Thousands

Skin Effect Ratio

at 90 C

60 Hz Ampacity

Amp*

1/16 x 1/2 0.0312 39.7 0.121 264 1 103

1/16 x 3/4 0.0469 59.7 0.181 175 1 145

1/16 x 1 0.0625 79.6 0.241 132 1 187

1/16 x 1 1/2 0.0938 119 0.362 87.7 1 270

1/16 x 2 0.125 159 0.483 65.8 1.01 345

1/8 x 1/2 0.0625 79.6 0.241 132 1 153

1/8 x 3/4 0.0938 119 0.362 87.7 1 215

1/8 x 1 0.125 159 0.483 65.8 1.01 270

1/8 x 1 1/2 0.188 239 0.726 43.8 1.01 385

1/8 x 2 0.25 318 0.966 32.9 1.02 495

1/8 x 2 1/2 0.312 397 1.21 26.4 1.02 600

1/8 x 3 0.375 477 1.45 21.9 1.03 710

1/8 x 3 1/2 0.438 558 1.69 18.8 1.04 810

1/8 x 4 0.5 636 1.93 16.5 1.04 900

3/16 x 1/2 0.0938 119 0.362 87.7 1 195

3/16 x 3/4 0.141 179 0.545 58.4 1.01 270

3/16 x 1 0.188 239 0.726 43.8 1.01 340

3/16 x 1 1/2 0.281 358 1.09 29.3 1.02 480

3/16 x 2 0.375 477 1.45 21.9 1.03 610

3/16 x 2 1/2 0.469 597 1.81 17.5 1.04 740

3/16 x 3 0.562 715 2.17 14.6 1.05 870

3/16 x 3 1/2 0.656 835 2.53 12.5 1.07 990

3/16 x 4 0.75 955 2.9 11 1.09 1100

1/4 x 1/2 0.125 159 0.483 65.8 1.01 240

1/4 x 3/4 0.188 239 0.726 43.8 1.01 320

1/4 x 1 0.25 318 0.966 32.9 1.02 400

1/4 x 1 1/2 0.375 477 1.45 21.9 1.03 560

1/4 x 2 0.5 637 1.93 16.5 1.04 710

1/4 x 2 1/2 0.625 796 2.41 13.2 1.06 850

1/4 x 3 0.75 955 2.9 11 1.08 990

1/4 x 3 1/2 0.875 1110 3.38 9.4 1.1 1150

1/4 x 4 1 1270 3.86 8.23 1.12 1250

1/4 x 5 1.25 1590 4.83 6.58 1.16 1500

1/4 x 6 1.5 1910 5.8 5.49 1.18 1750

3/8 x 3/4 0.281 358 1.09 29.3 1.02 415

3/8 x 1 0.375 477 1.45 21.9 1.03 510

3/8 x 1 1/2 0.562 715 2.17 14.6 1.05 710

3/8 x 2 0.75 955 2.9 11 1.08 880

3/8 x 2 1/2 0.938 1190 3.62 8.77 1.12 1050

3/8 x 3 1.12 1430 4.35 7.35 1.15 1200

3/8 x 3 1/2 1.31 1670 5.06 6.38 1.18 1350


16/26


17/26

hart

- Alloy 11000


18/26

50 C Rise 65 C Rise


19/26

Skin Effect Ratio

at 90 C

60 Hz Ampacity

Amp*

Skin Effect Ratio

at 90 C

60 Hz Ampacity

Amp*

1 136 1 157

1 193 1 225

1 250 1 285

1 355 1 410

1.01 460 1.01 530

1 205 1 235

1 285 1 325

1.01 360 1.01 415

1.01 510 1.01 590

1.02 660 1.02 760

1.02 800 1.02 920

1.03 940 1.03 1100

1.03 1100 1.03 1250

1.04 1200 1.04 1400

1 260 1 300

1.01 360 1.01 415

1.01 455 1.01 520

1.02 630 1.02 730

1.03 810 1.03 940

1.04 980 1.03 1150

1.05 1150 1.04 1350

1.06 1300 1.06 1500

1.08 1450 1.07 1700

1.01 315 1.01 360

1.01 425 1.01 490

1.02 530 1.02 620

1.03 740 1.03 860

1.04 940 1.04 1100

1.06 1150 1.06 1300

1.08 1300 1.07 1550

1.09 1500 1.09 1750

1.11 1700 1.1 1950

1.15 2000 1.14 2350

1.17 2350 1.17 2700

1.02 550 1.02 630

1.03 680 1.03 790

1.04 940 1.04 1100

1.08 1150 1.07 1350

1.1 1400 1.09 1600

1.14 1600 1.13 1850

1.16 1800 1.15 2100


20/26

1.19 2000 1.18 2350

1.23 2400 1.22 2800

1.26 2800 1.24 3250

1.04 820 1.04 940

1.08 1100 1.07 1250

1.11 1350 1.1 1550

1.15 1600 1.14 1850

1.19 1850 1.18 2150

1.22 2100 1.21 2400

1.25 2300 1.24 2650

1.3 2750 1.29 3150

1.34 3150 1.33 3650

1.4 4000 1.39 4600


21/26

Current Requirement at 30 C Rise

Amps

Required

Cross

Sectional

Area (sq. in.)

Standard

Conductor

Thicknesses

(in)

Calculated

Conductor

Width (in)

Resistivity

Ohms/Inch at

20 C

Inductance

Ohms/Inch

I A T W R L (Length)

50 0.016 0.02 0.806 0.042 0.198

50 0.016 0.04 0.403 0.042 0.396

50 0.016 0.062 0.26 0.042 0.613

50 0.016 0.093 0.173 0.042 0.921

50 0.016 0.125 0.129 0.042 1.236

100 0.032 0.02 1.613 0.021 0.099

100 0.032 0.04 0.806 0.021 0.198

100 0.032 0.062 0.52 0.021 0.307100 0.032 0.093 0.347 0.021 0.46

100 0.032 0.125 0.258 0.021 0.618

150 0.048 0.02 2.419 0.014 0.066

150 0.048 0.04 1.209 0.014 0.132

150 0.048 0.062 0.78 0.014 0.204

150 0.048 0.093 0.52 0.014 0.307

150 0.048 0.125 0.387 0.014 0.412

150 0.048 0.187 0.265 0.014 0.617

200 0.065 0.02 3.225 0.01 0.049

200 0.065 0.04 1.613 0.01 0.099

200 0.065 0.062 1.04 0.01 0.153

200 0.065 0.093 0.694 0.01 0.23

200 0.065 0.125 0.516 0.01 0.309

200 0.065 0.187 0.345 0.01 0.462

250 0.081 0.02 4.031 0.008 0.04

250 0.081 0.04 2.016 0.008 0.079

250 0.081 0.062 1.3 0.008 0.123

250 0.081 0.093 0.867 0.008 0.184250 0.081 0.125 0.645 0.008 0.247

250 0.081 0.187 0.431 0.008 0.37

300 0.097 0.02 4.838 0.007 0.033

300 0.097 0.04 2.419 0.007 0.066

300 0.097 0.062 1.56 0.007 0.102

300 0.097 0.093 1.04 0.007 0.153

300 0.097 0.125 0.774 0.007 0.206

Laminated Busbar Ampa

Table 4 - Design Considerations of Laminated C


22/26

300 0.097 0.187 0.517 0.007 0.308

For fast quotes on electrical bus bar connectors use Storm's easy online form to download your laminated b

For current pricing on Storm's - IN-STOCK- Copper Bar, Copper Sheet, Ground Bars, Punched Copper Connector

For wholesale and volume copper metal product purchases Call Michelle Hurt at 1-866-716-9773.HOME|ABOUT US| CONTACT US| DIRECTIONS| SEND A PRINT| SITE MAP| GLOSSARY
http://www.stormcopper.com/busbars-Laminations-prints.htmhttp://www.stormcopper.com/design/Storm-Copper-Busbar-Brochure.pdfhttp://www.stormcopper.com/busbars-Laminations-prints.htm


23/26

ity

opper Bus Bar


24/26

s bar prints directly to Storm

s, Cable Jumpers and Standoff Insulators Visit our Online Store


25/26

Number of

1/4x 4"

Busses*

0.15 0.4 0.7 0.9 0.15 0.4

1 1100 1250 1400 1600 1500 1700

2 1900 2050 2200 2300 2550 2750

3 2500 2700 2850 3000 3400 3600

4 3100 3300 3450 3600 4200 4400

Emissivity Emis

Busbar Emissivity C

Table 3 - Effects of Emissivity and Nu

Ampaci

30 C Rise 50 C


26/26

0.7 0.9 0.15 0.4 0.7 0.9

1900 2000 1700 1950 2200 2300

2950 3100 2950 3200 3400 3600

3850 4000 3950 4200 4500 4600

4700 4800 4900 5100 5400 5600

ivity Emissivity

nsiderations

ber of Busses on Ampacity

ty, Amp

Rise 65 C Rise

Documents

Busbar Design Considerations