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Busbar Ampacity Table 1

Busbar Emissivity Table 3

Laminated Busbar Ampacity

 

Busbar Design

 

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240 Industrial Park Lane,
Decatur, TN 37322
1-800-394-4804
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Busbar Design Considerations

Table 2 - Quick 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.

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