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Should small busbars be replaced with cables

Replacing small busbars with cables is generally not recommended due to lower current capacity, reduced heat dissipation, and higher maintenance complexity.

Current-Carrying Capacity and Heat Dissipation

Busbars, even small ones, have a larger surface area than cables, which allows for better heat dissipation and higher current-carrying capacity for the same cross-section. Cables, being round and insulated, dissipate heat less efficiently, which can lead to derating and potential overheating under high loads . Busbars also reduce the skin effect, improving power transmission efficiency .

Space and Layout Efficiency

Busbars are compact and modular, often requiring only 30–40% of the space needed for equivalent cable installations . In compact panels or switchgear, replacing busbars with cables can significantly increase space requirements and complicate routing. Busbars also provide uniform conductor lengths, whereas cables may vary, affecting load distribution .

Installation and Maintenance

Busbars are easier to install and maintain because they require fewer mounting points and bolted connections, which are inspectable and re-torqueable . Cables require cutting, crimping, and careful routing, increasing labor and the potential for installation errors. Busbars also simplify future modifications or expansions, while cable systems are more disruptive to reconfigure .

Safety and Reliability

Busbars have fewer connection points, reducing potential failure modes and fire load. Their rigid design and better heat dissipation make them safer under high-current conditions . Cables, especially in dense installations, can become tangled, harder to inspect, and more prone to overheating or insulation damage over time .

Cost Considerations

While cables may have a lower initial cost in small, simple systems, busbars often provide lower lifecycle costs due to reduced maintenance, higher efficiency, and easier upgrades .

Conclusion

For most applications, even small busbars should not be replaced with cables unless flexibility for irregular layouts is critical or the system operates at very low currents. Busbars offer superior current capacity, thermal performance, space efficiency, maintenance ease, and safety, making them the preferred choice in compact or high-reliability power distribution systems .

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