Journeyman vs Master Electrician Exam: What Actually Changes
The master exam is not the journeyman exam with harder questions. It adds services, load calculations, transformers, design and supervision, and in many states a business and law section.
Candidates who passed the journeyman exam a few years ago often assume the master exam is the same test with more difficult questions. It is a different test. The subject list is longer, the calculations are heavier, and in many states there is a whole section the journeyman exam never touched. Here is what changes.
What stays the same
The foundation is identical. Definitions, general requirements, branch circuits, feeders, overcurrent protection, grounding and bonding, wiring methods, conductor ampacity, box and conduit fill, motors. Expect these on the master exam at roughly the same share as before, often with slightly less hand-holding in the question.
What gets added
Services and distribution. Article 230 in depth: service conductors, disconnects, the number of services allowed, clearances, and how service equipment is grounded and bonded. Expect questions on multiple-occupancy buildings and on where the service point sits.
Load calculations at scale. Article 220 moves from a single dwelling to multi-family buildings, commercial occupancies, schools, restaurants and the optional methods for each. Demand factors for ranges, dryers, receptacles and kitchen equipment show up as multi-step problems. This is the single largest jump in difficulty.
Transformers. Article 450: primary and secondary current, overcurrent protection from Table 450.3(B), secondary conductor rules from 240.21(C), and the grounding of separately derived systems in 250.30. Journeyman exams touch transformers; master exams lean on them.
Design and supervision. Working space in 110.26, conductor derating in real layouts, voltage drop as a design limit, available fault current and the labelling rules in 110.24, selective coordination for emergency systems. The questions assume you are the person who signs off on the installation.
Special occupancies and systems. Hazardous locations (500 through 516), health care (517), emergency and standby systems (700, 701, 702), fire pumps (695), and the low-voltage articles in Chapter 7 appear more often and in more detail.
The business and law section
Many states require master or contractor candidates to pass a business and project management exam, either as a section of the master exam or as a separate test on the same day. Topics include estimating and bidding, contract law, lien law, payroll and tax basics, insurance and bonding, workers' compensation, OSHA recordkeeping and the state's own licensing statute. The reference for this section is usually a state-published business and law manual rather than the NEC.
Candidates skip this section in their study plan and then lose points they could have had with a week's reading. If your state includes it, give it that week.
Format differences
Master exams tend to be longer: 100 to 120 questions in four to five hours is common, versus 80 to 100 in three to four. The calculations share rises, often to a third of the exam. Some states score sections separately, which means you cannot let a strong code score cover a weak calculations or business score.
How to study differently
Start from your journeyman knowledge rather than from zero, but add three things from the first week: Article 220 Parts III, IV and V worked until the multi-family and commercial calculations are routine; transformers and separately derived systems as a block; and, where it applies, the business and law manual.
Use a master-level study guide and calculations guide rather than your old journeyman set. The questions are written to the master content outline and the practice exams are weighted the way the real exam is. The journeyman materials will not prepare you for the load calculations or the business section, which is where master candidates fail.
The practical difference afterwards
A master license usually lets you pull permits, design and lay out installations, supervise journeymen and apprentices, and serve as the qualifying party for an electrical contractor's license. That is why the exam tests planning and supervision: the state is licensing the person who is responsible for the whole job, not only the person who wires it.