How to Calculate Voltage Drop: A Practical UK Guide
Understand the voltage drop formula, the values you need, and how to check a cable run before installation.
8 min readRead article →
Practical electrical guides
Voltage drop and cable sizing guides
Expert-led guides on voltage drop, cable sizing and the calculations behind safe, efficient electrical circuits.
Latest articles
6 articlesFrom the knowledge base
3% vs 5% Voltage Drop: Which Limit Should You Use?
A clear explanation of common UK voltage-drop design limits for lighting and other final circuits.
6 min readRead article →
How to Choose Cable Size for a Long Cable Run
See how cable length, current and conductor size interact—and why voltage drop is only one part of cable selection.
9 min readRead article →
Voltage Drop in 12V and 24V DC Systems
Why small voltage losses matter more in low-voltage vehicles, boats, solar systems and battery installations.
7 min readRead article →
7 Common Voltage Drop Calculation Mistakes
Avoid return-length confusion, incorrect units, unrealistic temperature assumptions and other frequent errors.
5 min readRead article →
Three-Phase Voltage Drop Explained
Learn where the √3 factor comes from and how to enter three-phase circuit values correctly.
8 min readRead article →