Enter the width (mm), the thickness (mm), and the material carry capacity factor (amps/mm^2) into the calculator to determine the Busbar Current. 

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Busbar Current Formula

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The following formula is used to calculate the Busbar Current.

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Ibb = w*t * MF

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  • Where Ibb is the Busbar Current (amps)
  • w is the width (mm) 
  • t is the thickness (mm) 
  • MF is the material carry capacity factor (amps/mm^2) 
    • 1.2 for copper
    • .8 for aluminum
    • .6 for iron
    • 1.6 for silver

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How to Calculate Busbar Current?

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The following example problems outline how to calculate Busbar Current.

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Example Problem #1

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  1. First, determine the width (mm). In this example, the width (mm) is determined to be 40 .
  2. Next, determine the thickness (mm). For this problem, the thickness (mm) is measured to be 10 .
  3. Next, determine the material carry capacity factor (amps/mm^2). In this case, the material carry capacity factor (amps/mm^2) is found to be 1.2.
    1. Finally, calculate the Busbar Current using the formula above: 

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Ibb = w*t * MF

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Inserting the values from above and solving yields: 

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Ibb = 40*10 *1.2 = 480 (amps)

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Example Problem #2

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Using the same method as above, determine the variables required by the formula. For this example problem, these are:

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width (mm) = 5

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thickness (mm) = 3

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material carry capacity factor (amps/mm^2) = .6

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Enter these given values into the calculator or above yields: 

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Ibb = 5*3 * .6 = 9 (amps) 

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