Indal Handbook For Aluminium Busbar -

Aluminium’s lower modulus of elasticity (69 GPa) means it deflects more than copper under short-circuit.

| Width (mm) | Thickness (mm) | Cross-section per Phase (sq. mm) | AC Current (A) at 35°C Ambient, 50°C Rise | | :--- | :--- | :--- | :--- | | 50.8 | 6.35 | 322.58 | 670 | | 50.8 | 9.53 | 484.12 | 830 | | 76.2 | 6.35 | 483.87 | 960 | | 76.2 | 9.53 | 726.19 | 1180 | | 101.6 | 6.35 | 645.16 | 1235 | | 101.6 | 9.53 | 968.25 | 1495 | | 127 | 6.35 | 806.45 | 1505 | | 127 | 9.53 | 1210.31 | 1860 | Source: Compiled from INDAL CHART reference data Indal Handbook For Aluminium Busbar

The Indal Handbook dedicates an extensive section to proper installation practices to mitigate this risk. Step-by-Step Jointing Procedure Aluminium’s lower modulus of elasticity (69 GPa) means

| Bolt Size | Recommended Torque (Nm) | | :--- | :--- | | M8 | 25 Nm | | M10 | 50 Nm | | M12 | 85 Nm | | M14 | 100 Nm | | M16 | 120 Nm | Source: Typical tightening torque values for busbar joints Step-by-Step Jointing Procedure | Bolt Size | Recommended

: An overview of the physical and chemical properties of aluminium, highlighting its benefits like high strength-to-weight ratio and cost-effectiveness compared to copper.

The Indal Handbook strongly mandates using conical spring (Belleville) washers. These washers deflect during thermal expansion and maintain constant clamping pressure during cooling.