busbar design considerations
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Required Ampacity*
100-149
150-199
200-249
250-299
300-349
450-499
500-599
350-399
400-449
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800-899
600-699
700-799
900-999
1000-1249
1250-1499
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* 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
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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
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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
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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
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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
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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
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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.
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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
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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
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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
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Electrical Bus Bar Ampacity
TABLE 1. AMPACITIES OF COPPER BUSBARS
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Dimension, In.Weight Per Ft in
Lb.
DC Resistance
at 20 C,
Microhms/Ft.
Area 30 C Rise
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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
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hart
- Alloy 11000
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50 C Rise 65 C Rise
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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
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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
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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
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300 0.097 0.187 0.517 0.007 0.308
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ity
opper Bus Bar
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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
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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
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