Why Busducts Are Preferred Over Cables in Modern Electrical Systems

Why Busducts Are Preferred Over Cables in Modern Electrical Systems

by Ohm Engineering Works | Oct 11, 2025 | Electric Company

When connecting a Transformer to an LT Panel, many engineers today prefer busducts instead of traditional cables — and for good reason.
Here’s a breakdown of why busduct systems offer superior performance, reliability, and aesthetics for industrial and solar power projects.

🔹 Advantages of Busduct Over Cable

Lower Voltage Drop – Efficient power transfer with minimal energy loss.

Compact Routing – Saves space and offers a neat, organized layout.

Better Heat Dissipation – Reduces overheating risks, enhancing lifespan.

Cleaner Aesthetics – Provides a professional and tidy installation.

Easier Maintenance & Fault Isolation – Quick inspection and troubleshooting during operation.

Step-by-Step: Integrating a Busduct Between LT Panel and Transformer

1️⃣ Define Electrical Parameters

Current Rating: 4000A continuous

Voltage Level: 800V AC (common in MW-scale solar plants)

Phase Configuration: 3-phase, 3-wire system

Short Circuit Rating: Match LT panel and transformer fault levels

2️⃣ Select the Right Busduct

Type: Aluminium IP65-rated 3P customized busduct

Ingress Protection: IP65 (ideal for outdoor or dusty environments)

Conductor Material: Aluminium – lightweight & cost-effective

Insulation: Epoxy-coated

Thermal Rating: Must support ambient + solar heat gain

3️⃣ Mechanical Interface Planning

Busduct Entry on LT Panel: Use 5mm aluminium/stainless steel gland plate with gasket sealing

Mounting Structure: Use 75/100mm steel channels for base support

Alignment: Connect LT panel busbar chamber using flexible links or expansion joints

4️⃣ Connection to Transformer

Transformer Terminal Box: Match flange dimensions and terminal spacing

Transition Links: Use copper–aluminium links if terminals differ in material

Earthing: Provide dedicated earthing busbar bonded to LT panel and transformer body

5️⃣ Installation Best Practices

Maintain straight runs with minimal bends

Include thermal expansion joints if length >10 meters

Support every 1.5–2 meters with vibration-dampening clamps

Apply UV-resistant paint or canopy protection if installed outdoors

6️⃣ Testing & Commissioning

IR Test: Verify insulation resistance (phase-to-phase & phase-to-earth)

Continuity Test: Confirm phase integrity from LT panel to transformer

Torque Check: Tighten all bolted joints as per manufacturer’s specifications

Final Thoughts

Busducts provide a technically superior and visually cleaner alternative to cables for medium-voltage and high-current systems.
They improve system reliability, simplify maintenance, and ensure safety compliance — making them the preferred choice for industries, commercial buildings, and solar power plants.