383 free practice questions for this exam, each with the reason for the answer and where to look it up.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Finding your way around the National Electrical Code and the long-standing requirements electrician exams ask about. Questions cite the section; you need your own code book.
Ohm's law, power, series and parallel circuits, AC theory, three-phase, transformers and motors: the math and theory questions on journeyman and master electrician exams.
| Exam | Master electrician |
|---|---|
| Who runs it | State boards |
| Where | United States (varies by state) |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
In which conductor must the switching for three-way and four-way switches be done?
D. Only in the ungrounded conductor
Three-way and four-way switches are wired so all switching is in the ungrounded conductor. Switching the grounded conductor would leave the load energized with respect to ground when it is off.
Reference: NEC 2023, 404.2(A)
A 120/240 V panelboard is 20 in. wide. What is the minimum width of the working space in front of it?
C. 30 in.
The working space must be as wide as the equipment or 30 in., whichever is greater. Matching the 20 in. width of the panel is the common mistake.
Reference: NEC 2023, 110.26(A)(2)
How do Chapters 5, 6 and 7 relate to the general rules found in the earlier chapters?
D. They may supplement or modify the general rules
Chapters 5, 6 and 7 cover special occupancies, special equipment and special conditions, and they can add to or change the general rules for those cases. They do not throw out the general chapters; the general rules still apply except where the special chapter changes them.
Reference: NEC 2023, 90.3
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