Certifying authority: Skilled Trades Ontario (STO). Last checked 2026-09-10.
This trade is on Ontario’s compulsory list as Electrician — Construction and Maintenance (309A). Under Skilled Trades Ontario, workers must hold a valid Certificate of Qualification, a Provisional Certificate of Qualification, or a Registered Training Agreement; journeypersons must renew their C of Q each year. Official list PDF is dated Feb 2022; the count of 23 still matches the current STO page.
Source: Skilled Trades Ontario — Compulsory Trades (23 trades)
Whether it is required or not, the exam itself is the same paper everywhere in Canada. What your province decides is whether you must hold the certificate, how you apply, and where you sit it.
The Red Seal Occupational Standard sets the split below. It does not change by province.
| Major Work Activity | Weighting | Questions |
|---|---|---|
| MWA A: Performs common occupational skills | 11% | 11 Qs |
| MWA B: Installs, services and maintains generating, distribution and service systems | 28% | 28 Qs |
| MWA C: Installs, services and maintains wiring systems | 30% | 30 Qs |
| MWA D: Installs, services and maintains motors and control systems | 21% | 21 Qs |
| MWA E: Installs, services and maintains signalling and communication systems | 10% | 10 Qs |
Source: Red Seal Exam Breakdown — Construction Electrician (309A), red-seal.ca
4 hours, and a 70% pass mark. These are set provincially rather than by the Red Seal standard, and the four hours is the same whether your paper is 100 or 150 questions.
Confirmed against Skilled Trades Ontario’s Exam Preparation Guide and SkilledTradesBC. Check your own authority before exam day.
Booking is handled by Skilled Trades Ontario (STO); confirm current locations and dates with them.
Our Construction Electrician (309A) bank is built to the weighting above, with a worked explanation on every question.
Start Construction Electrician (309A) practice questions → Take the full 100-question timed mock exam →