The "Indal Handbook for Aluminium Busbars" is a widely recognized technical reference published by INDAL (now part of Hindalco ), detailing the design, selection, and installation of aluminium conductor systems.
Whether you are designing a switchgear or a massive smelter bus-trunking system, the remains a gold standard for ensuring that your "hot" aluminium installations remain cool, efficient, and safe.
Joints must be scratch-brushed, cleaned, and immediately treated with a jointing compound to prevent oxidation.
| Ambient Temperature | Derating Factor for Al Busbar (Uncoated) | | :--- | :--- | | 35°C (standard) | 1.00 | | 45°C | 0.88 | | 55°C | 0.76 | | 65°C (hot industrial) | 0.61 |
: Focuses on electrical-grade alloys like 6063 , which balance high conductivity (roughly 61% IACS) with the structural integrity needed to withstand short-circuit forces.
A common myth is that copper handles heat better. Let's settle this using the INDAL handbook data.
Where:
Use a high-temperature zinc-particle compound to bite into the aluminium and bridge microscopic gaps.
The heat generated in an aluminum busbar is a balance between internal heat generation (due to electrical resistance) and heat dissipation to the environment. The Indal handbook highlights several critical variables: 1. Skin Effect and Alternating Current (AC)
: Extruded sections provide uniform cross-sections, essential for reliable electrical contact at joints. Fabrication & Installation Standards
Copper vs Aluminum Busbars — Which Is Right for Your Project?
Heat lost to the surrounding air. Natural convection depends on whether the busbar is installed horizontally or vertically. Vertical orientations allow better air draft and cooling.
