1-800-394-4804

Quick Copper Busbar Design Selector

Quick Copper Busbar Design Selector 

Required Ampacity*

Busbar Dimension, Inches**

 

30 °C Rise

50 °C Rise

65 °C Rise

100-149

1/16 x 1/2
1/16 x 3/4

1/16 x 1/2

 

150-199

1/16 x 1
1/8 x 1/2
3/16 x 1/2

1/16 x 3/4

1/16 x 1/2

200-249

1/8 x 3/4
1/4 x 1/2

1/8 x 1/2

1/16 x 3/4
1/8 x 1/2

250-299

1/16 x 1 1/2
1/8 x 1
3/16 x 3/4

1/16 x 1
1/8 x 3/4
3/16 x 1/2

1/16 x 1

300-349

1/16 x 2
3/16 x 1
1/4 x 3/4

1/4 x 1/2

1/8 x 3/4
3/16 x 1/2

350-399

1/8 x 1 1/2

1/8 x 1
3/16 x 3/4

1/4 x 1/2

400-449

1/4 x 1
3/8 x 3/4

1/4 x 3/4

1/16 x 1 1/2
1/8 x 1
3/16 x 3/4

450-499

1/8 x 2
3/16 x 1 1/2

1/16 x 2
3/16 x 1

1/4 x 3/4

500-599

1/4 x 1 1/2
3/8 x 1

1/8 x 1 1/2
1/4 x 1
3/8 x 3/4

1/16 x 2
1/8 x 1 1/2
3/16 x 1

600-699

1/8 x 2 1/2
3/16 x 2
1/2 x 1

1/8 x 2
3/16 x 1 1/2
3/8 x 1

1/4 x 1
3/8 x 3/4

700-799

1/8 x 3
3/16 x 2 1/2
1/4 x 2
3/8 1 1/2

1/4 x 1 1/2

1/8 x 2
3/16 x 1 1/2
3/8 x 1

800-899

1/8 x 3 1/2
3/16 x 3
1/4 x 2 1/2
3/8 x 2

1/8 x 2 1/2
3/16 x 2
1/2 x 1

1/4 x 1 1/2

900-999

3/16 x 3 1/2
1/4 x 3

3/16 x 2 1/2
1/4 x 2
3/8 x 1 1/2

3/16 x 2
1/2 x1

1000-1249

3/16 x 4
1/4 x 3 1/2
3/8 x 2 1/2
3/8 x 3
1/2 x 2
1/2 x 2 1/2

1/8 x 4
3/16 x 3
1/4 x 2 1/2
3/8 x 2

1/8 x 3
3/16 x 2 1/2
1/4 x 2
3/8 x 1 1/2

1250-1499

1/4 x 4
3/8 x 3 1/2
1/2 x 3

3/16 x 3 1/2
3/16 x 4
1/4 x 3
3/8 x 2 1/2
1/2 x 2

1/8 x 4
3/16 x 3
1/4 2 1/2
3/8 x 2

1500-1749

1/4 x 5
3/8 x 4
1/2 x 3 1/2
1/2 x 4

1/4 x 3 1/2
1/4 x 4
3/8 x 3
1/2 x 2 1/2

3/16 x 3 1/2
3/16 x 4
1/4 x 3
3/8 x 2 1/2
1/2 x 2

1750-1999

1/4 x 6
3/8 x 5

3/8 x 3 1/2
1/2 x 3

1/4 x 3 1/2
1/4 x 4
3/8 x 3
1/2 x 2 1/2

2000-2499

1/4 x 8
3/8 x 6
1/2 x 5
1/2 x 6

1/4 x 6
3/8 x 5
1/2 x 4

1/4 x 5
3/8 x 4
1/2 x 3 1/2

2500-2999

1/4 x 10
3/8 x 8

3/8 x 6
1/2 x 5

1/4 x 6
3/8 x 5
1/2 x 4

* For 60 Hz current.

** Table gives busbar cross section which will probably be large enough for Ampacities within each range. Knowing required ampacity, determine possible busbar dimensions from the table. Then check Table 1 to verify that size selected has the necessary ampacity. Example: Assume that required ampacity is 185 amps at 30 °C rise. Table 2 indicates that 1/16 x 1 in. size would probably be adequate. This is confirmed by Table 1 which lists the ampacity of 1/6 x 1 in. busbar as 187 amps.