Copper has many uses. As a manufacturer specializing in producing copper busbars, we bring a lot of related knowledge about copper to everyone. Do you know why copper busbars are applied in circuits? It is necessary to rely on relevant calculation results to confirm whether the copper busbars are qualified and can work normally in the circuit. NextCopper bus manufacturerHere we introduce the calculation of copper busbar current carrying capacity, as well as some related information about copper busbars.

Let's first explain what a copper busbar is. A copper busbar refers to a long conductor made of copper, with a cross-section that is rectangular or chamfered (rounded corner) rectangular. It is generally called a copper main bus, copper busbar, copper collector busbar, or grounding copper busbar. The main manufacturing process of copper busbars includes: standard material selection → smelting → casting → rolling → billet opening → pickling → finishing rolling → edge milling → machining (drilling, bending, tin plating) → packaging → warehousing. Copper busbars are suitable for electrical engineering involving high and low voltage electrical appliances, switch contacts, distribution equipment, and busway, and are also widely used in metal smelting, electroplating, chemical caustic soda, and other ultra-high current electrolytic smelting projects.

Estimation method:

Current carrying capacity of a single copper busbar = Width (mm) × Thickness factor

Double busbar current carrying capacity = Width (mm) × Thickness coefficient × 1.5 (empirical coefficient)

Copper busbars and aluminum busbars can also be calculated by square meter; usually, copper should be priced at 5-8A per square meter.

Aluminum should follow 3-5A per square mm;

Common methods for calculating the current-carrying capacity of copper busbars:

At 40°C, the copper busbar carrying flow rate = busbar width × thickness factor

Busbar width (mm); thickness coefficient:

When the busbar is 12 thick, it is 20; When 10 is thick, it is 18;

In order: [12-20, 10-18, 8-16, 6-14, 5-13, 4-12].

Double-layer copper busbar [40℃] = 1.56-1.58 single-layer copper busbar [40℃] (depending on cross-sectional size) 3-layer copper busbar [40℃] = 2 single-layer copper busbar [40℃]

4-layer copper busbar [40°C] = single layer copper busbar [40°C] * 2.45 (this choice is not recommended; special-shaped busbars are better alternatives)

Copper busbar [40°C] = Copper busbar [25°C] * 0.85

aluminum busbars [40°C] = copper busbars [40°C] / 1.3

For example, the current carrying capacity of TMY100*10 is:

Single layer: 100*18=1800(A) [manual specifies 1860A];

Double-layer: 2 (TMY100*10) has a current-carrying capacity of: 1860*1.58=2940(A); [According to manual, it is 2942A];

Layer 3: The current carrying capacity of 3(TMY100*10) is: 1860*2 = 3720(A) [The manual lists it as 3780A]

All the above calculations are accurate and very close to the manual data.

Additionally, the copper busbar load flow rate has a very simple calculation formula:

Carrying current rate of a single rectangular copper busbar = row width * (row thickness 8.5) A

For example: The current carrying capacity of 15*3 at 40℃ = 15*11.5 = 172.5A

At 100*8 at 40°C, the current capacity = 100*16.5 = 1650A

Double-layer current-carrying capacity = 1.5 times single-layer current-carrying capacity

Three-layer current-carrying capacity = 2.0 times single-layer current-carrying capacity

Current carrying capacity (A) 10 13 17 23 30 45 85 110 136 170 216 263 3. Standards for selecting drawer wires for drawer cabinets

Cross-section (mm²): 10 16 16 25 35 50 70 35×2 50×2 70×2 50×3 70×3

Current (A) 50 63 80 100 125 160 200 250 300 400 500 60

That’s all for the introduction to the current-carrying capacity of copper busbars for now. Hopefully, it will be helpful when you use copper busbars. If you want to learn more, please stay tuned to Yixing Xindake! Yixing Xindake New Energy Technology Co., Ltd. is a professional company providing high-quality copper foil flexible connector services and is worthy of your trust!