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.

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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