Industrial Electrician (442A)
Install, maintain, and repair electrical systems in industrial plants, mills, and processing facilities.
A Red Seal endorsement is a seal on your provincial or territorial trade certificate. It shows you have the knowledge and skills to practice your trade across Canada — earned by passing the interprovincial Red Seal exam.
What this trade covers
Industrial electricians install, maintain, test, troubleshoot and repair industrial electrical equipment and associated electrical and electronic controls. They work in plants, mills, mines, and processing facilities on power distribution, motors and drives, process control, and communication systems.
Exam format
- • 100 multiple-choice questions
- • 4-hour time limit
- • 70% required to pass
- • Closed-book
- • Closed-book — mathematical formulas and acronyms are provided at the exam sitting
- • 100 questions, 4 hours, 70% to pass
- • Questions align with the Red Seal Occupational Standard (RSOS) for Industrial Electrician
- • Heavier critical-thinking weight than most trades — expect calculations and troubleshooting scenarios
Question types
Every question has one correct answer and three incorrect options — not trick questions, but distractors are not always obvious.
- Knowledge and recall10–20%
- Procedural and application35–45%
- Critical thinking40–50%
Exam blueprint (RSOS)
Questions are distributed across major work activities defined in the Red Seal Occupational Standard — the same breakdown used on the official exam.
Performs common occupational skills
Installs and maintains generating, distribution and service systems
Installs and maintains wiring systems
Installs and maintains rotating and non-rotating equipment and control systems
Installs and maintains signalling and communication systems
Installs and maintains process control systems
Sample question
Critical thinkingWhat is the maximum allowable voltage drop for branch circuits supplying power, heating, or lighting loads according to the Canadian Electrical Code (CEC)?
- A. 3%
- B. 2%
- C. 10%
- D. 5%
Explanation: According to Rule 8-102(1)(a) of the CEC, the voltage drop in branch circuits shall not exceed 3% of the system voltage at the farthest outlet of power, heating, or lighting loads.
Official Red Seal resources
Source material from the Red Seal Program — administered by the Canadian Council of Directors of Apprenticeship (CCDA).
- Red Seal Occupational Standard →
Complete description of trade activities — the basis for exam questions
- RSOS full standard (PDF) →
Full RSOS with tasks, sub-tasks, and supporting knowledge requirements
- Exam information & self-assessment →
Question breakdown, types, formulas, and acronyms used on the exam
- How to register →
Steps to register for your Red Seal examination