Don't Fail Your Electrician Exam! Mock Test Guide

Test your knowledge with this electrician exam question set. I am walking through real-world scenarios to sharpen your diagnostic skills.Getting ready for your assessments means understanding how to approach complex electrical systems. Whether you are dealing with domestic, commercial, or industrial properties, being able to perform accurate fault diagnosis is a core competency every sparky needs to master.We look at specific technical challenges, including the correct procedures for safe isolation and how to interpret Zs measurement results. These practice questions are designed to help you identify common issues quickly so you can resolve them confidently on site. Proper electrical testing is the foundation of a safe installation, and these mock scenarios will help you prepare for the real thing.Subscribe for more electrician exam questions, apprentice revision, and real-world sparky knowledge.0:00 Setting the Stage for Fault Diagnosis0:47 Environmental Factors in Electrical Faults2:15 Analyzing Discrepancies in Loop Impedance4:22 The Importance of Documenting Test Results5:55 Mastering the Sequence of Dead Testing11:03 Diagnosing Persistent Circuit Breaker Trips17:22 Handling Intermittent Faults That Clear40:03 Safety Procedures for Near-Live WorkHow good is your electrical fault finding? ⚡After more than 20 years working as an electrician, I decided to sit a full fault diagnosis mock exam and see how much I actually know.This one covers 60 questions, 90 minutes, with a 60% pass mark.I ended up with…78% ✅So apparently when someone rings me with an electrical fault, I’ve got about a 78% chance of figuring it out. 😂In this video I work through fault diagnosis questions covering:✅ Electrical fault finding✅ Zs and Ze readings✅ R1+R2 testing✅ High resistance faults✅ Ring final circuit faults✅ Insulation resistance testing✅ RCD faults and nuisance tripping✅ Neutral-to-earth faults✅ Safe isolation✅ Proving dead✅ Faulty circuit breakers✅ Three-phase faults✅ Phase rotation✅ Open neutral faults✅ PME / TN-C-S supplies✅ Earth fault loop impedance✅ Earth leakage testing✅ Clamp meters✅ Continuity testing✅ High resistance connections✅ Reverse polarity✅ Outdoor lighting faults✅ Moisture ingress✅ Arcing faults✅ Motor faults✅ Fault finding documentation✅ Intermittent electrical faults✅ Electrical testing instruments✅ Apprentice electrician revisionWhat I like about fault finding is that you can apply the questions to things you actually see on site.For example:If a circuit breaker immediately trips again after you reset it with no load connected, there’s probably still a persistent fault somewhere on that circuit.If outdoor lighting works intermittently, moisture ingress or corroded connections should definitely be somewhere on your list of things to investigate.If you’ve got a high resistance connection, you might start finding localised heating and discolouration, especially as the load increases.And if a customer says:“It trips sometimes…”That’s when the fun really begins. 😂One of the biggest parts of good fault diagnosis is working logically.Test.Record the reading.Use that result to decide what you test next.That is basically how I approach fault finding on site.There are also plenty of questions in this exam that made me stop and think — especially when we get into three-phase systems, VFDs, PME faults and some of the more technical testing questions.So if you’re training to become an electrician, studying City & Guilds, preparing for fault diagnosis assessments or you simply want to test your knowledge, play along and see if you can beat my 78%.⚠️ This video shows me working through a mock exam and thinking aloud. Always use current BS 7671, manufacturer guidance, HSE guidance and your course material when carrying out electrical work or preparing for an assessment.