Indal Handbook For Aluminium Busbar

One of the most critical chapters in the handbook deals with jointing. Aluminium rapidly forms a hard, insulating oxide layer when exposed to air. The handbook outlines specific procedures to overcome this:

A 50m outdoor busbar run in Rajasthan (temperature swing: 5°C to 48°C) had no expansion joints. After 6 months, the busbar buckled 75mm out of plane. Lesson: Install an expansion joint every 10m or for cumulative temperature differences exceeding 40°C.

"Do not use pure aluminium (EC grade) for high-cycle thermal load busbars. Always specify E91E." — A direct caution from the Indal installation guidelines. Indal Handbook For Aluminium Busbar

The handbook famously addresses the "volume-for-volume" comparison with copper. It establishes that:

However, the handbook demonstrates that even with the increased size, the weight of the aluminium busbar remains only half that of its copper equivalent. This makes aluminium the undisputed choice for long busbar runs (busducts) and high-rise risers where structural support is a concern. One of the most critical chapters in the

For rectangular bars at 50/60 Hz: | Bar thickness (mm) | Skin effect ratio (Rac/Rdc) | |--------------------|-----------------------------| | 3 mm | 1.01 | | 6 mm | 1.07 | | 10 mm | 1.20 | | 12 mm | 1.30 | | 15 mm | 1.45 |

Practical rule: Do not exceed 10 mm thickness per bar for 60 Hz AC. Use multiple thinner bars or tubular shapes instead. A 50m outdoor busbar run in Rajasthan (temperature

The Indal Handbook emphasizes the specific engineering adjustments required when switching from copper to aluminium.