Indal Handbook For Aluminium Busbar Hot Today

The layout of the busbars directly affects their cooling. For example, using provides a greater surface area for heat dissipation than a single, very thick bar.

Clean the contact surfaces thoroughly to remove grease and dirt. indal handbook for aluminium busbar hot

In AC applications, current tends to flow primarily along the outer skin of the conductor. This effectively reduces the usable cross-sectional area, increases AC resistance, and generates more heat compared to Direct Current (DC) applications. 2. Proximity Effect The layout of the busbars directly affects their cooling

| Issue | INDAL Solution | | :--- | :--- | | (Al flows under pressure at 90°C) | Use Belleville washers (spring washers) that maintain constant pressure. Standard flat washers lose 50% clamping force after 3 thermal cycles. | | Oxidation | Apply zinc-filled or copper-filled inhibitor paste (e.g., Penetrox, Alnox). Do not use plain grease—it evaporates at 80°C. | | Dissimilar metals (Cu-Al) | Use bimetal plated washers or tinned Al lugs. Direct contact causes galvanic heating (additional 15-20°C rise). | | Torque | INDAL specifies 20-25 Nm for M10 bolts on 10mm thick bar. Over-torque strips threads; under-torque creates hot joints. | In AC applications, current tends to flow primarily

Billets are heated to approximately 800°F – 925°F (425°C – 495°C) to make the metal pliable.

Most industrial standards (such as IS, IEC, and ANSI) limit the continuous operating temperature of bare aluminium busbars to 90°C to 105°C .