Indal Handbook For Aluminium Busbar Hot File

| Condition | Temperature Limit (Ambient 50°C) | Action Required | | :--- | :--- | :--- | | | 85°C - 90°C (Rise of 35-40K) | Standard inspection | | Hot Spot – Warning | 105°C - 110°C | Infrared scan & torque check | | Hot Spot – Critical | > 120°C | Immediate shutdown & overhaul | | Short-time emergency (1 hr) | 150°C (Risk of annealing) | Load reduction mandatory |

Unlike copper, aluminium has a higher coefficient of thermal expansion (23.8 x 10⁻⁶ /°C vs. copper’s 16.8 x 10⁻⁶ /°C) and different creep characteristics. When a busbar gets "hot" (operating at 85°C to 105°C), three things happen: indal handbook for aluminium busbar hot

) : The base current capacity for various sizes (e.g., flat bars, tubular sections, or U-channels) at standard conditions (typically ambient and : | Condition | Temperature Limit (Ambient 50°C) |