Table 2: Mechanical Properties
Ampacities and Mechanical Properties of Rectangular Copper Busbars
| Dimensions, In. | Area | Weight Per Foot, Lb | Horizontal Axis | Yield Load, *Lb | |||
|---|---|---|---|---|---|---|---|
| Square In. | Circular Mils, Thous | Moment of Inertia In. 4 | Section Modulus, In. 3 | Radius of Gyration In. | |||
| 1/16 x 1/2 1/16 x 3/4 1/16 x 1 1/16 x 1 1/2 1/16 x 2 |
0.0312 0.0469 0.0625 0.0938 0.125 |
39.7 59.7 79.6 119 159 |
0.121 0.181 0.241 0.362 0.483 |
0.000651 0.00220 0.00521 0.0176 0.0417 |
0.000260 0.00586 0.0104 0.0234 0.0417 |
0.144 0.217 0.289 0.433 0.577 |
780 1,170 1,560 2,340 3,120 |
| 1/8 x 1/2 1/8 x 3/4 1/8 x 1 1/8 x 1 1/2 1/8 x 2 1/8 x 2 1/2 1/8 x 3 1/8 x 3 1/2 1/8 x 4 |
0.0625 0.0938 0.125 0.188 0.250 0.312 0.375 0.438 0.500 |
79.6 119 159 239 318 397 477 558 636 |
0.241 0.362 0.483 0.726 0.966 1.21 1.45 1.69 1.93 |
0.00130 0.00440 0.0104 0.0352 0.0833 0.163 0.281 0.447 0.667 |
0.00521 0.0117 0.0208 0.0469 0.0833 0.130 0.188 0.255 0.333 |
0.144 0.217 0.289 0.433 0.577 0.722 0.866 1.01 1.16 |
1,560 2,340 3,120 4,690 6,250 7,810 9,380 10,940 12,500 |
| 3/16 x 1/2 3/16 x 3/4 3/16 x 1 3/16 x 1 1/2 3/16 x 2 3/16 x 2 1/2 3/16 x 3 3/16 x 3 1/2 3/16 x 4 |
0.0938 0.141 0.188 0.281 0.375 0.469 0.562 0.656 0.750 |
119 179 239 358 477 597 715 835 955 |
0.362 0.545 0.726 1.09 1.45 1.81 2.17 2.53 2.90 |
0.00195 0.00659 0.0156 0.0527 0.125 0.244 0.422 0.670 1.00 |
0.00781 0.0176 0.0312 0.0703 0.125 0.195 0.281 0.383 0.500 |
0.144 0.217 0.289 0.433 0.577 0.722 0.866 1.01 1.16 |
2,340 3,520 4,690 7,031 9,380 11,700 14,100 16,400 18,800 |
| 1/4 x 1/2 1/4 x 3/4 1/4 x 1 1/4 x 1 1/2 1/4 x 2 1/4 x 2 1/2 1/4 x 3 1/4 x 3 1/2 1/4 x 4 1/4 x 5 1/4 x 6 1/4 x 8 1/4 x 10 1/4 x 12 |
0.125 0.188 0.250 0.375 0.500 0.625 0.750 0.875 1.00 1.25 1.50 2.00 2.50 3.00 |
159 239 318 477 637 796 955 1,110 1,270 1,590 1,910 2,550 3,180 3,820 |
0.483 0.726 0.966 1.45 1.93 2.41 2.90 3.38 3.86 4.83 5.80 7.73 9.66 11.6 |
0.00260 0.00879 0.0208 0.0703 0.167 0.326 0.562 0.893 1.33 2.60 4.50 10.7 20.8 36.0 |
0.0104 0.0234 0.0417 0.0938 0.167 0.260 0.375 0.510 1.667 1.04 1.50 2.67 4.17 6.00 |
0.144 0.217 0.289 0.433 0.577 0.722 0.866 1.01 1.16 1.44 1.73 2.31 2.89 3.46 |
3,120 4,690 6,250 9,380 12,500 15,600 18,800 21,900 25,000 31,200 37,500 50,000 62,500 75,000 |
| 3/8 x 3/4 3/8 x 1 3/8 x 1 1/2 3/8 x 2 3/8 x 2 1/2 3/8 x 3 3/8 x 3 1/2 3/8 x 4 3/8 x 5 3/8 x 6 3/8 x 8 3/8 x 10 3/8 x 12 |
0.281 0.375 0.562 0.750 0.938 1.12 1.31 1.50 1.88 2.25 3.00 3.75 4.50 |
358 477 715 955 1,190 1,430 1,670 1,910 2,390 2,860 3,820 4,770 5,730 |
1.09 1.45 2.17 2.90 3.62 4.35 5.06 5.80 7.26 8.69 11.6 14.5 17.4 |
0.0132 0.0312 0.105 0.250 0.488 0.844 1.34 2.00 3.91 6.75 16.0 31.2 54.0 |
0.0352 0.0625 0.141 0.250 0.391 0.562 0.766 1.00 1.56 2.25 4.00 6.25 9.00 |
0.217 0.289 0.433 0.577 0.722 0.866 1.01 1.16 1.44 1.73 2.31 2.89 3.46 |
7,030 9,380 14,100 18,800 23,400 28,100 32,800 37,500 46,900 56,200 75,000 93,800 112,000 |
| 1/2 x 1 1/2 x 1 1/2 1/2 x 2 1/2 x 2 1/2 1/2 x 3 1/2 x 3 1/2 1/2 x 4 1/2 x 5 1/2 x 6 1/2 x 8 1/2 x 10 1/2 x 12 |
0.500 0.750 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.00 |
637 955 1,270 1,590 1,910 2,230 2,550 3,180 3,820 5,090 6,360 7,640 |
1.93 2.90 3.86 4.83 5.80 6.76 7.73 9.66 11.6 15.5 19.3 23.2 |
0.0417 0.0141 0.0333 0.0651 1.12 1.79 2.67 5.21 9.00 21.3 41.7 72.0 |
0.0833 0.188 0.333 0.521 0.750 1.02 1.33 2.08 3.00 5.33 8.33 12.0 |
0.289 0.433 0.577 0.722 0.866 1.01 1.16 1.44 1.73 2.31 2.89 3.46 |
9,000 13,500 18,000 22,500 27,000 31,500 36,000 45,000 54,000 72,000 90,000 108,000 |
| 3/4 x 4 3/4 x 5 3/4 x 6 3/4 x 8 3/4 x 10 3/4 x 12 |
3.00 3.75 4.50 6.00 7.50 9.00 |
3,820 4,770 5,730 7,640 9,550 11,500 |
11.6 14.5 17.4 23.2 29.0 34.8 |
4.00 7.81 13.5 32.0 62.5 108. |
2.00 3.12 4.50 8.00 12.5 18.0 |
1.16 1.44 1.73 2.31 2.89 3.46 |
54,000 67,500 81,000 108,000 135,000 162,000 |
| * In this instance, yeild load equals yield strength times cross-sectional area of the busbar. A yield strength of 25,000 psi has been assumed for busbar less than 1/2 in. thick and 18,000 psi for busbar 1/2 in. thick or more. | |||||||
| Dimensions, In. | Area | Weight Per Foot, Lb | Vertical Axis | Yield Load,* Lb | |||
|---|---|---|---|---|---|---|---|
| Square In. | Circular Mils, Thous | Moment of Inertia In. 4 | Section Modulus, In. 3 | Radius of Gyration In. | |||
| 1/16 x 1/2 1/16 x 3/4 1/16 x 1 1/16 x 1 1/2 1/16 x 2 |
0.0312 0.0469 0.0625 0.0938 0.125 |
39.7 59.7 79.6 119 159 |
0.121 0.181 0.241 0.362 0.483 |
0.0000102 0.0000153 0.0000203 0.0000305 0.0000407 |
0.000326 0.000488 0.000651 0.000977 0.00130 |
0.0180 0.0180 0.0180 0.0180 0.0180 |
780 1,170 1,560 2,340 3,120 |
| 1/8 x 1/2 1/8 x 3/4 1/8 x 1 1/8 x 1 1/2 1/8 x 2 1/8 x 2 1/2 1/8 x 3 1/8 x 3 1/2 1/8 x 4 |
0.0625 0.0938 0.125 0.188 0.250 0.312 0.375 0.438 0.500 |
79.6 119 159 239 318 397 477 558 636 |
0.241 0.362 0.483 0.726 0.966 1.21 1.45 1.69 1.93 |
0.0000814 0.000122 0.000163 0.000244 0.000326 0.000407 0.000488 0.000570 0.000651 |
0.00130 0.00195 0.00260 0.00391 0.00521 0.00651 0.00781 0.00912 0.0104 |
0.0361 0.0361 0.0361 0.0361 0.0361 0.0361 0.0361 0.0361 0.0361 |
1,560 2,340 3,120 4,690 6,250 7,810 9,380 10,940 12,500 |
| 3/16 x 1/2 3/16 x 3/4 3/16 x 1 3/16 x 1 1/2 3/16 x 2 3/16 x 2 1/2 3/16 x 3 3/16 x 3 1/2 3/16 x 4 |
0.0938 0.141 0.188 0.281 0.375 0.469 0.562 0.656 0.750 |
119 179 239 358 477 597 715 835 955 |
0.362 0.545 0.726 1.09 1.45 1.81 2.17 2.53 2.90 |
0.000275 0.000412 0.000549 0.000824 0.00110 0.00137 0.00165 0.00192 0.00220 |
0.00293 0.00440 0.00586 0.00879 0.0117 0.0146 0.0176 0.0205 0.0234 |
0.0541 0.0541 0.0541 0.0541 0.0541 0.0541 0.0541 0.0541 0.0541 |
2,340 3,520 4,690 7,031 9,380 11,700 14,100 16,400 18,800 |
| 1/4 x 1/2 1/4 x 3/4 1/4 x 1 1/4 x 1 1/2 1/4 x 2 1/4 x 2 1/2 1/4 x 3 1/4 x 3 1/2 1/4 x 4 1/4 x 5 1/4 x 6 1/4 x 8 1/4 x 10 1/4 x 12 |
0.125 0.188 0.250 0.375 0.500 0.625 0.750 0.875 1.00 1.25 1.50 2.00 2.50 3.00 |
159 239 318 477 637 796 955 1,110 1,270 1,590 1,910 2,550 3,180 3,820 |
0.483 0.726 0.966 1.45 1.93 2.41 2.90 3.38 3.86 4.83 5.80 7.73 9.66 11.6 |
0.000651 0.000977 0.00130 0.00195 0.00260 0.00326 0.00391 0.00456 0.00521 0.00651 0.00781 0.00104 0.0130 0.0156 |
0.00521 0.00781 0.0104 0.0156 0.0208 0.0260 0.0312 0.0365 0.0417 0.0521 0.0625 0.0833 0.104 0.125 |
0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 0.0722 |
3,120 4,690 6,250 9,380 12,500 15,600 18,800 21,900 25,000 31,200 37,500 50,000 62,500 75,000 |
| 3/8 x 3/4 3/8 x 1 3/8 x 1 1/2 3/8 x 2 3/8 x 2 1/2 3/8 x 3 3/8 x 3 1/2 3/8 x 4 3/8 x 5 3/8 x 6 3/8 x 8 3/8 x 10 3/8 x 12 |
0.281 0.375 0.562 0.750 0.938 1.12 1.31 1.50 1.88 2.25 3.00 3.75 4.50 |
358 477 715 955 1,190 1,430 1,670 1,910 2,390 2,860 3,820 4,770 5,730 |
1.09 1.45 2.17 2.90 3.62 4.35 5.06 5.80 7.26 8.69 11.6 14.5 17.4 |
0.00330 0.00439 0.00659 0.00879 0.0110 0.0132 0.0154 0.0176 0.0220 0.0264 0.0352 0.0439 0.0527 |
0.0176 0.0234 0.0352 0.0469 0.0586 0.0703 0.0820 0.0938 0.117 0.141 0.188 0.234 0.281 |
0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 0.108 |
7,030 9,380 14,100 18,800 23,400 28,100 32,800 37,500 46,900 56,200 75,000 93,800 112,000 |
| 1/2 x 1 1/2 x 1 1/2 1/2 x 2 1/2 x 2 1/2 1/2 x 3 1/2 x 3 1/2 1/2 x 4 1/2 x 5 1/2 x 6 1/2 x 8 1/2 x 10 1/2 x 12 |
0.500 0.750 1.00 1.25 1.50 1.75 2.00 2.50 3.00 4.00 5.00 6.00 |
637 955 1,270 1,590 1,910 2,230 2,550 3,180 3,820 5,090 6,360 7,640 |
1.93 2.90 3.86 4.83 5.80 6.76 7.73 9.66 11.6 15.5 19.3 23.2 |
0.0104 0.0156 0.0208 0.0260 0.0312 0.0365 0.0417 0.0521 0.0625 0.0833 0.104 0.125 |
0.0417 0.0625 0.0833 0.104 0.125 0.146 0.167 0.208 0.250 0.333 0.417 0.500 |
0.144 0.144 0.144 0.144 0.144 0.144 0.144 0.144 0.144 0.144 0.144 0.144 |
9,000 13,500 18,000 22,500 27,000 31,500 36,000 45,000 54,000 72,000 90,000 108,000 |
| 3/4 x 4 3/4 x 5 3/4 x 6 3/4 x 8 3/4 x 10 3/4 x 12 |
3.00 3.75 4.50 6.00 7.50 9.00 |
3,820 4,770 5,730 7,640 9,550 11,500 |
11.6 14.5 17.4 23.2 29.0 34.8 |
0.141 0.176 0.211 0.281 0.352 0.422 |
0.375 0.469 0.562 0.750 0.938 1.12 |
0.216 0.216 0.216 0.216 0.216 0.216 |
54,000 67,500 81,000 108,000 135,000 162,000 |
| * In this instance, yield load equals yeild strength times cross-sectional area of the busbar. A yield strength of 25,000 psi has been assumed for busbar less than 1/2 in. thick and 18,000 psi for busbar 1/2 in. thick or more. | |||||||
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