Cable Sizing
Cable sizing is a critical part of electrical design, ensuring cables can safely carry current under real installation conditions. This section covers current-carrying capacity, derating factors, installation methods, and key standards such as BS 7671 and IEC 60287.
You’ll find practical guidance, calculation methods, and engineering insights to help you select the correct cable size for a wide range of applications.
Knowledge Base Topics
Articles
Cable Derating Factors: Applying Current Rating Correction Factors
An introduction to cable derating factors and how correction factors are applied to current-carrying capacity calculations.
Updated May 27, 2026
Cable Sizing: Current Capacity, Voltage Drop and Fault Withstand
An overview of cable sizing checks, including current-carrying capacity, voltage drop, fault withstand, installation conditions and key design variables.
Updated May 27, 2026
Parallel Cables: Current Capacity, Voltage Drop and Fault Rating
Key design considerations when running cables in parallel, including current sharing, voltage drop and individual cable fault rating.
Updated May 27, 2026
CPR: Construction Products Regulation for Cables
CPR cable classification explained, including reaction-to-fire classes, labelling and specifying CPR-rated cables for construction works.
Updated June 5, 2026