Cable Duct Size Calculator Uk Jun 2026

Common for smaller three-phase supplies or multiple sub-mains.

Advanced calculators incorporate a pulling tension check based on cable mass, coefficient of friction (0.3 – 0.5 typical for PVC duct), and bend radius. cable duct size calculator uk

To help you cross-check your calculator’s output, here are typical duct sizes for common UK applications: In the UK, this is essential for compliance

A cable duct size calculator helps electrical engineers, installers, and designers determine the minimum internal diameter (or cross-sectional area) of a duct (conduit, trunking, or underground pipe) needed to safely house cables. In the UK, this is essential for compliance with and Civil engineering specifications (e.g., for highways, utilities). Common UK Duct Sizes and Use Cases

Not all online calculators are created equal. A truly useful UK-specific tool must account for:

[ \textDuct Diameter = 2 \times \sqrt\frac\textMinimum Duct Area\pi ]

A maximum 40–45% fill is recommended to allow for air circulation and easier installation. Common UK Duct Sizes and Use Cases