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

Applying for a Industrial Electrician job in the UK? Here is what you are likely to be asked. These questions come from our Industrial Electrician question bank of 12 questions, written for UK employers at mid-level level.

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

1. Explain how a direct-on-line starter and a star-delta starter work and when you would use each.

Why they ask: Motor starting methods are basic knowledge for industrial electricians.

2. How would you fault find on a machine that has stopped and its control panel shows no obvious alarm?

Why they ask: Fault finding is the central skill and they want a logical method.

3. You are called to a production line breakdown and the production manager is pressuring you to restart it quickly. You think the guard interlock has been bypassed. What would you do?

Why they ask: Safety versus production pressure is a real daily challenge in industry.

4. What is a variable speed drive, and what would you check when one trips on a fault?

Why they ask: VSDs are widespread in industrial plant and often cause call-outs.

5. Tell me about a time you fixed a breakdown that was costing the business money.

Why they ask: Industrial electricians are valued for minimising downtime.

6. What is lock-out tag-out and how do you apply it on industrial plant?

Why they ask: Isolation of energy is vital where there are multiple energy sources and people working on the same equipment.

7. Your site has an ageing motor control centre that keeps tripping, and your manager asks if you can simply upsize the breaker. What do you say?

Why they ask: This tests protection knowledge and whether you'd compromise safety.

8. What do you enjoy about industrial electrical maintenance, and how do you handle shift work and call-outs?

Why they ask: They need to know you understand the demands of industrial maintenance.

A sample answer to question 1

Explain how a direct-on-line starter and a star-delta starter work and when you would use each.

A direct-on-line starter connects the motor straight to the supply using a contactor, with overload protection. It's simple and cheap but gives a high starting current, often six to eight times full load, and a sharp mechanical shock. It suits smaller motors or where the supply can cope. A star-delta starter first connects the motor windings in star, which reduces the voltage across each winding and cuts the starting current to roughly a third, then after a timer, switches to delta for normal running. It needs a motor with all six terminals brought out, and suits larger motors that start without a heavy load, such as fans or pumps. Neither controls speed, so where I need soft starting or speed control, I'd choose a soft starter or variable speed drive, depending on the application.

Common mistake to avoid: Mixing up star and delta voltages; ignoring load type

Want the rest?

Full model answers, key points and common mistakes for all 12 questions are on the Industrial Electrician interview questions page. The first five are free, no sign-up needed.