What AFDDs Actually Detect | Ring vs Radial Circuits ExplainedAFFDs Explained

AFDDs are one of the most debated topics in modern circuit protection. Some electricians see them as an important step forward in reducing fire risk. Others question whether they are necessary at all. What is often missing from the conversation is a clear explanation of what these devices actually detect and how the circuit they are installed on changes what they see. In this video we break down how Arc Fault Detection Devices (AFDDs) actually work, why waveform disturbance matters, and how the type of circuit they are installed on can influence how they interpret faults. Topics covered in this video include: • What AFDDs actually detect • Why series arc faults may not trigger traditional protective devices • How AFDDs analyse waveform disturbance • The difference between ring circuits and radial circuits • Why signal behaviour changes depending on circuit topology • How modern electrical loads create switching noise • The difference between switching noise and arc disturbance • Why installation quality still plays the biggest role in preventing faults Understanding how AFDDs interpret waveform behaviour helps electricians make better decisions when designing, installing and testing circuits. Download the White Paper This video is based on a Navitas technical white paper that explains arc fault detection in more detail. Download the full paper here: https://www.navitascp.co.uk/downloads About Navitas Navitas Circuit Protection develops circuit protection solutions for modern electrical installations. Alongside our products we publish technical guidance and white papers to help electricians and wholesalers better understand how protective devices behave in real installations. Chapters 0:00 Introduction 0:49 Why AFDDs cause confusion 2:06 What AFDDs actually detect 4:14 Radial circuits explained 5:06 Ring circuits explained 6:14 Noise vs disturbance 8:08 Why AFDDs were introduced 9:33 Key things to consider before installing AFDDs 10:31 Download the white paper