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Bus Bar Design Considerations

TABLE 2. QUICK BUSBAR SIZE 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 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

1250-14999 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.

Busbar Ampacity Tables
Action
Table
Table Name
#1
 Ampacities of Copper Alloy 11000 Busbars
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#2
 Quick Busbar Size Selector
#3
 Effect of Emissivity and Number of Busses on Ampacity

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