This is the technical section that cannot be ignored. The ratings we discussed assume a standard temperature of 40°C ambient air (in Australia). But what if your installation is different?
| Installation Method | Approx. Current Carrying Capacity | Recommended Max Breaker | | :--- | :--- | :--- | | Clipped direct to timber, open air | 40-42 A | 32A or 40A | | In wall cavity (not insulated) | 35-38 A | 32A | | In conduit in insulated ceiling (40°C) | 28-32 A | 25A or 32A* | | Buried directly in thermal insulation | 18-22 A | 16A or 20A | | In conduit with 3 other circuits (grouped) | ~25 A | 20A | current carrying capacity of 4mm cable australia
Now, let’s try a 25 Amp load over 60 meters: This is the technical section that cannot be ignored
It's essential to note that these values are based on specific conditions and may need to be adjusted using derating factors to account for various installation conditions, such as: | Installation Method | Approx