Master Electrician Practice Test: Harder Calculations, More Theory

The master electrician practice test is not a harder version of the journeyman test. It covers different scope: service entrance design, transformer sizing, standby systems, and broader load calculation theory. Maryland has a 90-question master bank, open-book, 2020 NEC. Take the free 15-minute diagnostic to see which NEC sections need the most work before you pay for anything.

How the master exam differs from the journeyman exam

The journeyman exam tests field wiring knowledge. The master exam tests design-level knowledge. That shift matters because the wrong answers are designed differently. On a journeyman question, the trap answer usually applies a rule from the wrong article. On a master question, the trap answer often applies the right article but the wrong calculation sequence, or misses a demand factor that changes the answer by one conductor size.

The NEC articles that get heavier weight on master exams include: Article 220 branch circuit, feeder, and service load calculations. Article 230 service entrances. Article 240 overcurrent protection at the service level. Article 250 grounding electrode system sizing for larger services. Article 430 motor branch circuit and feeder design. Article 450 transformers. Articles 700, 701, and 702 for legally required, optional, and standby systems. Table 310.16 for larger conductors that do not come up on residential work.

The theory questions go further too. A journeyman question might ask what size conductor to use. A master question might ask why the NEC requires that size, which exception applies in a specific scenario, or how the answer changes if the installation is on a rooftop in a high-ambient-temperature environment. The codebook does not tell you which question to turn to first. That is what practice does.

Maryland: the only state with a dedicated master bank

Maryland is the standout state on this platform for master prep. The Maryland Journeyperson exam is 70 questions, open-book, 2020 NEC. The Maryland master electrician exam is 90 questions, same open-book format, same 2020 NEC edition, but broader scope. The 20-question difference is mostly in service design and standby system rules that the Journeyperson exam barely touches.

Open-book on a 90-question exam sounds forgiving. It is not. The calculation questions expect you to know which table to pull before you open the book, chain several table values together in the right order, and check your work against the correct demand factor. If you are flipping pages to find the starting point, you are already behind on time.

The Maryland master question bank on JourneymanIQ is built to that scope. Every approved question has a step-by-step walkthrough that shows the calculation path, cites the controlling NEC article, and explains why each wrong answer is wrong. See the full Maryland exam guide for format details.

What master practice looks like across all five states

Texas, California, Michigan, and Washington currently have journeyman-level question banks on JourneymanIQ. If you are pursuing a master or contractor license in one of those states, the journeyman bank still covers the NEC fundamentals that master exams build on. Grounding and bonding, branch circuit sizing, overcurrent protection, and wiring methods show up at every license level. The master exam adds scope on top of that foundation.

Texas master electrician candidates: the TDLR master exam uses a similar closed-book format to the journeyman exam, with heavier weight on service design and Article 230. The Texas journeyman bank on JourneymanIQ covers the NEC sections shared between the two exams. See the Texas TDLR exam guide.

California general contractor and C-10 electrical contractor candidates: California uses the 2023 NEC, which has updated AFCI and GFCI requirements compared to earlier editions. The California question bank on JourneymanIQ covers the 2023 NEC articles. See the California exam guide.

Michigan and Washington candidates advancing toward master or contractor licenses: both states use open-book exams on current NEC editions. The journeyman banks for Michigan and Washington cover the foundational NEC articles before you move up to master-level scope.

How to use the diagnostic for master prep

The free diagnostic is 15 questions, about 15 minutes, no signup, no card. It covers the NEC articles that show up across all exam levels and scores you by topic. For a master candidate, the diagnostic tells you which of the shared fundamentals still need work before you add the master-specific scope on top.

After the diagnostic, use Pro or Pro+ to drill the weak topics the diagnostic flagged. Pro is $49. Pro+ is $129 for three months of full access including the adaptive engine and the complete question bank across all five states. We do not promise you will pass. We tell you, in priority order, which NEC sections to focus on based on what the diagnostic revealed. That is a concrete next step.