Answer / Mohd Imran

The bush bar size for copper and aluminum depends on several factors, such as current density, voltage, temperature, and insulation materials. Here's a general method to calculate the bush bar size:
1. Determine the current density (I/A), where I is the total current passing through the bush bar and A is its cross-sectional area.
2. Calculate the voltage drop across the bush bar using Ohm's law (V = I*R, where R is the resistance of the bush bar).
3. Select an appropriate insulation material based on the operating temperature, current density, and voltage drop.
4. Use tables or charts provided by the insulation manufacturer to find the required bush bar size for the given insulation material, current density, and voltage drop.

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