Maintenance Electrician Interview Questions UK: 8 Real Questions and What Interviewers Want

Applying for a Maintenance Electrician job in the UK? Here is what you are likely to be asked. These questions come from our Maintenance Electrician question bank of 16 questions, written for UK employers at mid-level level.

Eight Maintenance Electrician interview questions, and what the interviewer is thinking

1. Talk me through your safe isolation procedure on a live industrial or commercial circuit.

Why they ask: Safe isolation is the single most important safety skill for a maintenance electrician.

2. What does BS 7671 require, and which edition and amendments do you work to?

Why they ask: Interviewers need to know you work to the current wiring regulations.

3. You are called to a production line that has stopped and the manager is pressing you to restore it quickly. What do you do?

Why they ask: This tests whether you can balance urgency with safe working.

4. How would you fault-find on a three-phase motor that keeps tripping its overload?

Why they ask: This tests your logical diagnostic method on common plant equipment.

5. What is the difference between an RCD and an RCBO, and where would you use each?

Why they ask: Protective device knowledge is a daily requirement for the role.

6. Tell me about a time you diagnosed a difficult electrical fault that others had struggled to find.

Why they ask: Shows real diagnostic ability and persistence.

7. Which tests would you carry out when verifying an alteration to an existing circuit, and in what order?

Why they ask: Correct test sequence shows competence in inspection and testing.

8. Why do you want to work as a maintenance electrician rather than in installation?

Why they ask: Employers want commitment to maintenance work specifically.

A sample answer to question 1

Talk me through your safe isolation procedure on a live industrial or commercial circuit.

I follow the GS38 and HSE-endorsed procedure every time. First I identify the circuit and the correct means of isolation, then notify anyone affected and obtain a permit or authority where the site requires it. I switch off and isolate at the source, then secure it with my own personal padlock, hasp and a warning tag, keeping the key on me. Next I prove my voltage indicator on a known proving unit, test between all live conductors and to earth at the point of work, and re-prove the tester afterwards. Only then do I treat the circuit as dead. On a plant motor I also check for stored energy, such as capacitors, and mechanical hazards, and I coordinate with the machine operator under the site's lock-out tag-out rules. I never rely on a switch position alone, and I only remove my lock when I have personally finished and cleared the job.

Common mistake to avoid: Relying on a switch or panel label; sharing locks or leaving the tester unproven

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Maintenance Electrician interview questions page. The first five are free, no sign-up needed.