Ampacities and Mechanical Properties of Rectangular Copper Busbars

Mechanical Properties - This table lists properties useful in calculating such characteristics as stiffness and deflection that are often required by designers of bus bar systems.

Dimensions, In.AreaWeight Per Foot, LbHorizontal AxisYield Load, *Lb
Square In.Circular Mils, ThousMoment of Inertia In. 4Section Modulus, In. 3Radius 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.AreaWeight Per Foot, LbVertical AxisYield Load,* Lb
Square In.Circular Mils, ThousMoment of Inertia In. 4Section Modulus, In. 3Radius 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.