After 40 years working as a qualified electrician and 20 years teaching the next generation of sparks, I’ve witnessed just about every error an aspiring electrician can make. I’m Sezai Aramaz—though most of my learners just call me “Sparky.”
Mistakes aren’t failures—they’re part of the learning process. But in this trade, the cost of getting it wrong can be high. That’s why I turn every error into a teachable moment, whether I’m guiding learners through our Level 2 Electrical Installation course or helping them refine their skills during the 2391 Inspection and Testing qualification.
In this article, I’ll walk you through the most common trainee electrician errors I’ve seen across our electrical courses, and more importantly, how to avoid them. These tips could save you time, money, and potentially your safety—so take note and learn from others before making the same mistakes yourself.
I once caught a trainee skipping voltage checks because he was rushing. He got a minor zap—a harsh wake-up call. According to voltage testing best practices published by HSE, failure to verify dead circuits before working on them is a leading cause of on-site injuries.
Skipping safety steps risks severe injury or even fatalities, turning minor mistakes into disasters.
Drill my trainees with my “Confirm-Test-Confirm” routine: verify tools on a known live source, test your circuit, then confirm again. No exceptions.
One apprentice set his multimeter to measure amps instead of volts. When he tested the circuit, the meter popped spectacularly.
Wrong settings not only damage expensive tools but also lead to dangerous electric faults, harming you and the installation.
Always double-check meter settings before testing—voltage, current, resistance. I instil the habit through constant repetition.
A student cut a cable too short, attempting a quick job. He had to replace metres of expensive cable.
Incorrect cable length costs money, delays jobs, and creates untidy, unsafe installations.
Teach the golden rule: “Measure twice, cut once.” I always insist my trainees mark and re-check lengths carefully before cutting.
A learner wrongly labelled neutral wires as live. It took hours to rectify during testing.
Incorrect wiring colours or labelling can lead to confusion, faults, and future maintenance nightmares.
Every wire is labelled and colour-checked. We use labelling drills and quizzes on wiring colours until they become second nature.
A trainee neglected proper earthing on a commercial job. Luckily, I spotted it before the panel went live.
Poor earthing can lead to electric shocks, equipment damage, and safety inspection failures.
I teach rigorous earthing checks with a Megger tester. No trainee leaves my sessions without understanding earthing thoroughly.
One student chose a thin cable gauge for a heavy-duty circuit. The cable quickly overheated during testing. My trainees are taught to use cable gauge charts from trusted sources like the IET to ensure safe and compliant installations.
Incorrect cable sizing leads to overheating, fires, and serious safety risks.
We constantly practise referencing cable gauge charts and calculating load, ensuring accuracy every time.
A trainee once decided permits were “too much hassle”. Council inspections later flagged the job. Skipping permits doesn’t just risk fines—it often leads to rework after failed inspections. That’s why I make sure learners understand electrical permits and compliance from day one.
Ignoring electrical regulations and permits can shut down job sites and cost fines, time, and reputation.
My trainees learn local codes thoroughly, practising mock permit applications to build compliance habits.
An apprentice hurried off without final tests. The circuit failed under load, causing downtime and embarrassment.
Un-tested installations fail unpredictably, risking your reputation, safety, and repeat work.
Post-installation checks are mandatory in my class. Continuity, insulation, and functional tests are always performed—no excuses.
A trainee tightened a connection so hard he snapped a connector. It meant extra repair work on site.
Over-tightening damages fittings, weakens connections, and risks failures under load conditions.
Every connection has a specified torque value. My trainees practise using torque screwdrivers, learning correct torque by feel.
One eager student rushed through an installation and miswired an entire distribution board, costing hours of redo-work.
Speeding through electrical tasks creates avoidable errors, increases costs, and poses safety hazards.
I slow my trainees down deliberately. Methodical work habits and checklists always beat rushing. Speed comes with accuracy.
In my decades of experience, I’ve developed a simple but effective memory aid for trainees:
“Measure – Label – Lockout – Test – Torque – Verify.”
It encapsulates every critical step needed to produce high-quality, safe electrical installations every time. Stick to this, and you’ll significantly reduce electrician training mistakes.
Q: What’s the simplest way to remember safety routines?
A: Always perform a visual checklist—Confirm, Test, Confirm again. Never assume; always verify.
Q: How can I get better at memorising Wiring Regulations?
A: Practise daily with quizzes and mock scenarios. You should also get familiar with resources like the Wiring Regulations overview provided by the IET.
Q: Wire sizing is tricky—what’s the best technique to master it?
A: Regularly consult cable sizing charts and perform load calculations. Practise until it becomes automatic.
Q: Why is correct torque on electrical fittings so important?
A: Proper torque ensures safe, reliable connections, reducing the risk of overheating, faults, and connection failures.
Avoiding these common trainee electrician errors isn’t rocket science, but it does require consistent, disciplined practise. Remember, the best sparks aren’t those who never made mistakes—they’re those who learned quickly from them.
Got questions or want more electrical course tips? Reach out—I’m here to help. Better yet, join one of my sessions and get hands-on, practical guidance from a seasoned spark who’s genuinely seen it all.
Sezai Aramaz is the esteemed founder of Learn Trade Skills, boasting over 40 years of experience in the electrical industry in the UK. With two decades dedicated to educating future electricians, he served as an Electrical Installation Lecturer and Assessor. Aramaz's expertise and commitment have contributed significantly to the growth and proficiency of aspiring tradespeople in the field.
Learn Trade Skills (LTS) is a Vocational Training Centre based in Cheshunt, Hertfordshire that specialises in training electricians.
© Copyright Learn Trade Skills 2025
“Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut pretium tristique purus nec consectetur. Nulla feugiat eget tellus aliquam scelerisque. Sed eget luctus enim, sed mattis enim. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut pretium tristique purus nec consectetur. Nulla feugiat eget tellus aliquam scelerisque. Sed eget luctus enim, sed mattis enim.Nulla feugiat eget tellus aliquam scelerisque. Sed eget luctus enim, sed mattis enim. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut pretium tristique purus nec consectetur. Nulla feugiat eget tellus aliquam scelerisque. Sed eget luctus enim, sed mattis enim.”
William Goss
Electrician course
11/11/2024
