Cable Derating Factors [portable]

A 120mm² copper, XLPE cable (90°C rating) has nominal 400A in free air at 30°C.

Cable derating factors are used to adjust the current-carrying capacity of a cable to account for factors that can affect its performance and lifespan. These factors can include: cable derating factors

Let’s break down the primary derating factors, the physics behind them, and how to apply them in practice. A 120mm² copper, XLPE cable (90°C rating) has