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Ampactiy Table

This table applies to a two-layer bus bar using a 0.005 dielectric. It gives the corresponding cross sectional dimensions, the resistivity and the inductance/inch for various amperage requirements at a 30°C max temperature rise.

Current Requirement at a 30° C max temp. rise
Required Cross Sectional Area in sq. in.
Available Standard Conductor Thickness Inches
Calculated Conductor Width Inches
Resistivity Ohms/Inch at 20°C
Inductance Nanohenrys per Inch
I
A
T
W
R
L
50
0.016
0.020
0.806
0.042
0.198
50
0.016
0.040
0.403
0.042
0.396
50
0.016
0.062
0.260
0.042
0.613
50
0.016
0.093
0.173
0.042
0.920
50
0.016
0.125
0.129
0.042
1.236
50
0.016
0.187
0.086
0.042
1.850
100
0.032
0.020
1.613
0.021
0.099
100
0.032
0.040
0.806
0.021
0.198
100
0.032
0.062
0.520
0.021
0.307
100
0.032
0.093
0.347
0.021
0.460
100
0.032
0.125
0.258
0.021
0.618
100
0.032
0.187
0.172
0.021
0.925
150
0.048
0.020
2.419
0.014
0.066
150
0.048
0.040
1.209
0.014
0.132
150
0.048
0.062
0.780
0.014
0.204
150
0.048
0.093
0.520
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
0.020
3.225
0.010
0.049
200
0.065
0.040
1.613
0.010
0.099
200
0.065
0.062
1.040
0.010
0.153
200
0.065
0.093
0.694
0.010
0.230
200
0.065
0.125
0.516
0.010
0.309
200
0.065
0.187
0.345
0.010
0.462
250
0.081
0.020
4.031
0.008
0.040
250
0.081
0.040
2.016
0.008
0.079
250
0.081
0.062
1.300
0.008
0.123
250
0.081
0.093
0.867
0.008
0.184
250
0.081
0.125
0.645
0.008
0.247
250
0.081
0.187
0.431
0.008
0.370
300
0.097
0.020
4.838
0.007
0.033
300
0.097
0.040
2.419
0.007
0.066
300
0.097
0.062
1.560
0.007
0.102
300
0.097
0.093
1.040
0.007
.0153
300
0.097
0.125
0.774
0.007
0.206
300
0.097
0.187
0.517
0.007
0.308