Bus Bar Profile vs. Current Density
The following chart shows the impact of changes in bus bar size to the overall current density of the conductor.
| Dimension, In. | Area | Weight Per Ft in Lbs |
Amperage | DC Resistance at 20° C |
30° C Rise | 50° C Rise | 65° C Rise | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 2 | .125 | 159 | .483 | 460 | 2760 | 65.8 | 1.01 | 345 | 1.01 | 460 | 1.01 | 530 |
| 1/8 x 1 | .125 | 159 | .483 | 589 | 2160 | 65.8 | 1.01 | 270 | 1.01 | 360 | 1.01 | 415 |
| 1/8 x 3 1/2 | .438 | 558 | 1.69 | 688 | 1849 | 18.8 | 1.04 | 810 | 1.03 | 1100 | 1.03 | 1250 |
| 3/16 x 1 | .188 | 239 | .726 | 702 | 1808 | 43.8 | 1.01 | 340 | 1.01 | 455 | 1.01 | 520 |
| 3/16 x 3 | .562 | 715 | 2.17 | 821 | 1548 | 14.6 | 1.05 | 870 | 1.05 | 1150 | 1.04 | 1350 |
| 1/4 x 3/4 | .188 | 239 | .726 | 746 | 1702 | 43.8 | 1.01 | 320 | 1.01 | 425 | 1.01 | 490 |
| 1/4 x 3 | .750 | 955 | 2.90 | 965 | 1320 | 11.0 | 1.08 | 990 | 1.08 | 1300 | 1.07 | 1550 |
| 3/8 x 2 1/2 | .938 | 1190 | 3.62 | 1133 | 1119 | 8.77 | 1.12 | 1050 | 1.10 | 1400 | 1.09 | 1600 |
| 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 4 | 2.00 | 2550 | 7.73 | 1500 | 850 | 4.11 | 1.26 | 1700 | 1.25 | 2300 | 1.24 | 2650 |
| 1/2 x 10 | 5.00 | 4770 | 14.5 | 1998 | 640 | 1.65 | 1.48 | 3250 | 1.46 | 4800 | 1.44 | 3750 |
| 3/4 x 10 | 7.50 | 9550 | 7.73 | 2274 | 560 | 1.10 | 1.67 | 5600 | 1.64 | 5600 | 1.62 | 6500 |