Calculation of Copper Bar Current Capacity | How to Choose Copper Bars in High Voltage Cabinets? How to calculate the current carrying capacity and bending of copper bars? Detailed explanation with pictures and text!

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1. How to determine the current carrying capacity of a copper busbar through theoretical calculation

The current carrying capacity of a copper busbar can be determined through theoretical calculation using the following method: Basic formula (40 ℃ ambient temperature, single-layer copper busbar) Current carrying capacity (A)=busbar width (mm) × thickness coefficient. The thickness fiber blind coefficient is determined based on the thickness of the copper bar, such as 12mm corresponds to 20, 10mm corresponds to 18, 8mm corresponds to 16, 6mm corresponds to 14, 5mm corresponds to 13, and 4mm corresponds to 12. For example, a 100mm × 10mm copper busbar with a current carrying capacity of 100 × 18=1800A. The current carrying capacity of a multi-layer copper busbar is corrected to a single-layer current carrying capacity of 1.56-1.58 (the larger value is taken when the cross-section is large); The current carrying capacity of a three-layer copper busbar is 2 times that of a single layer; The current carrying capacity of a four layer copper busbar is a single layer current carrying capacity of 2.45. It is recommended to use a vertical stool, but it is not recommended for four or more layers. It is suggested to replace it with an irregular busbar. The current carrying capacity of a 100 × 10mm double-layer copper busbar is approximately 1860 × 1.58 ≈ 2940A. Under a temperature correction factor of 25 ℃, the current carrying capacity is 40 ℃ current carrying capacity x 1.18 (i.e., 40 ℃ current carrying capacity=25 ℃ current carrying capacity x 0.85). Aluminum busbar conversion: Aluminum busbar 40 ℃ current carrying capacity=Copper busbar 40 ℃ current carrying capacity ÷ 1.3. The rapid estimation method (square number m

2. What is the current carrying capacity of copper bars? How to calculate? Summary of formulas for calculating the current carrying capacity of copper bars. Formula 1: Current carrying capacity of a single circle and a copper busbar=width (mm) X thickness coefficient. Double mother row orange cautious current carrying capacity=width (mm) X thickness coefficient X 1.5 (empirical coefficient). Copper bars and aluminum bars can also be measured by square meters, usually copper should be measured by 5-8A/square meter, and aluminum should be measured by 3-5A/square meter. At 40 ℃, the current carrying capacity of the copper busbar is equal to the width of the busbar multiplied by the thickness coefficient. Row width (mm); The thickness coefficient is: when the thickness of the mother row shed is 12, it is 20; When the thickness is 10, it is 18; In order: [12-20, 10-18, 8-16, 6-14, 5-13, 4-12]. Formula 2: Double layer copper bar [40 ℃]=1.56-1.58 Single layer copper bar [40 ℃] (depending on the cross-sectional size) 3 layer copper bars [40 ℃]=2 Single layer copper bars [40 ℃]. Copper bar [40 ℃]=Copper bar [25 ℃] * 0.85; Aluminum bar [40 ℃]=copper bar [40 ℃]/1.3. 4-la

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