Free Master Electrician Practice Test Guide

A free master electrician practice test gives you real NEC knowledge and calculations questions in the same two-part format most state boards use: code knowledge first, then load and conductor calculations. Take one before you spend a dollar on anything else. It shows you exactly where your gaps are before exam day costs you a real fee and a scheduling headache.

Exact question counts, timing, and fees are set state by state, not nationally, though most boards run the same three-part structure: code knowledge, calculations, and a 70 percent cut score. We’ll use Texas’s published exam blueprint as the concrete example throughout, since the Texas Department of Licensing and Regulation (TDLR) is one of the few boards that publishes exact item counts and timing in a public bulletin. Check your own state board’s page for your state’s numbers before you schedule anything.

What Does the Master Electrician Exam Actually Test?

The master electrician license is the top tier of state electrical licensing, one step above journeyman, and it’s usually the license that lets you pull permits and run your own electrical contracting business. The exam tests the same NEC territory as the journeyman exam, but goes deeper into calculations, because a master is legally on the hook for design decisions, not just installation.

Across most states, the content splits into recognizable buckets:

Definitions, theory, and plan reading
Services, service equipment, and separately derived systems
Feeders and branch circuit conductors
Wiring methods and materials
Motors and generators
Special occupancies and renewable energy systems

Texas weights branch circuits and service equipment the heaviest on the NEC knowledge portion, and motors and generators the heaviest on the calculations portion, according to TDLR’s Electrician Candidate Information Bulletin. If your state publishes a similar content outline, study it before you study anything else. It tells you where the exam actually spends its questions.

How Is the Exam Structured, and How Is It Scored?

Most master electrician exams are split into two timed portions, a code knowledge section and a calculations section, and you have to pass each one separately at the same cut score. Texas’s version looks like this:

Portion	Items	Non-scored items	Time allowed	Passing score
NEC Knowledge	75	5	150 minutes	70%
Calculations	33	3	170 minutes	70%

This table comes straight from TDLR’s Candidate Information Bulletin, and it’s worth noting the non-scored items: every exam seeds a handful of experimental questions that don’t count toward your score but do count toward your time. You won’t know which ones they are, so treat every question like it matters.

The exam is open book. Since October 1, 2023, TDLR’s electrician exams have referenced the 2023 edition of the National Electrical Code, and candidates bring their own soft-bound NEC book, tabbed with the publisher’s own index tabs, no handwritten notes added during the test itself. Other states run similar open-book rules against whatever NEC edition their state has adopted, so confirm your edition before you buy or tab a code book.

What Does a Free Practice Test Cover Well, and Where Does It Fall Short?

A solid free practice test covers definitions, common calculations, and code-navigation drills, which is the same ground the NEC knowledge portion covers. It’s genuinely useful for finding out whether you can locate a table in your code book fast enough under pressure, which is half the battle on test day.

What a free test usually can’t replicate is the actual exam conditions: two separate timed portions (150 and 170 minutes, each with a hard cutoff), a scored breakdown by content area when you fail, and calculations pulled from the exact code edition your state has adopted. A single unscored quiz also can’t tell you which content area is dragging your score down. That diagnostic breakdown is part of what your exam fee actually buys.

Our take: use free questions to build speed and confidence on definitions and code lookups, then run a timed, full-length mock exam that matches your state’s real item count and time limits before you schedule the actual test. Practicing 20 random questions with no clock teaches you almost nothing about whether you’ll finish the calculations portion in 170 minutes.

What Does It Cost to Become a Master Electrician?

The costs stack up before you ever sit for the exam. In Texas, TDLR charges $78 to sit for both portions of the Master Electrician exam, and the same $78 applies if you need to retake either portion, according to the Candidate Information Bulletin. On top of the exam fee, TDLR’s master electrician license application carries a non-refundable $45 application fee, and you’ll need your own current-edition NEC book, which typically runs $80 to $130 depending on binding and tabs.

Add a study guide or prep course if you want one, and a realistic all-in budget for exam costs alone (not counting years of journeyman wages) lands somewhere between $200 and $400 in most states. That’s before your annual license renewal fee kicks in.

What Are the Requirements to Sit for the Exam?

You can’t walk in off the street and take the master electrician exam. Most states require documented journeyman experience first. In Texas, a candidate must have held a Journeyman Electrician license for at least two years and completed 12,000 hours of on-the-job training under a Texas-licensed Master Electrician, per TDLR’s master electrician license page. Journeyman Industrial Electrician hours don’t count toward that requirement in Texas, which trips people up. Each supervising master has to sign an experience verification form, so keep that paperwork current as you go rather than trying to track down a former employer two years later.

Other states set their own thresholds, ranging from two to four years of journeyman experience, so confirm the exact number with your own board before you assume Texas’s rule applies to you.

10 Practice Questions to Test Yourself

These are original questions we wrote to mirror the format and difficulty of the calculations and knowledge portions. Work each one before you check the answer.

A dwelling unit has 1,800 square feet of habitable floor area. Using the standard 3 volt-amperes per square foot for general lighting, what is the calculated general lighting load? Answer: 1,800 x 3 = 5,400 VA. This is the baseline general lighting load before you add small appliance and laundry circuits.
A 3/0 AWG copper conductor is installed with two other current-carrying conductors in the same raceway. Before any ampacity adjustment, what is its base ampacity at 75°C? Answer: 200 amps. That’s the 75°C column value for 3/0 AWG copper from the standard ampacity table, before you apply any adjustment or correction factors for conductor count or ambient temperature.
What is the minimum size copper grounding electrode conductor typically required for a service with 2/0 AWG copper service-entrance conductors? Answer: 4 AWG copper. Grounding electrode conductor sizing is based on the size of the largest ungrounded service conductor, and mid-size services in that range commonly land on a 4 AWG minimum, so confirm the exact conductor size against your code table before finalizing a design.
A single-phase motor has a full-load current of 20 amps. What is the minimum branch-circuit conductor ampacity required, using the standard 125 percent factor for a continuous motor load? Answer: 20 x 1.25 = 25 amps minimum conductor ampacity.
Four current-carrying conductors are installed in one conduit. What derating factor applies before you calculate the adjusted ampacity? Answer: 80 percent. Four to six current-carrying conductors in a single raceway typically require an 80 percent adjustment factor applied to the base ampacity.
What is a “continuous load” under the NEC, and why does it matter for conductor sizing? Answer: A continuous load is one expected to run at maximum current for three hours or more. It matters because continuous loads require conductors and overcurrent devices sized at 125 percent of the load, not 100 percent, which is why the motor question above uses the same 1.25 multiplier.
A 4-inch square box (1-1/2 inch deep) contains six 12 AWG conductors, no clamps, and no devices. Using standard box-fill volume allowances, is a single 4-inch square 1-1/2 inch deep box (21.0 cubic inches) large enough? Answer: Six 12 AWG conductors at 2.25 cubic inches each equals 13.5 cubic inches, which fits within 21.0 cubic inches. Yes, the box is large enough for the conductors alone, though you’d still need to account for any device yoke, clamp, or grounding conductor allowance separately.
What disconnecting means clearance is typically required in front of an electrical panel rated 240 volts or less? Answer: 3 feet of clear working space is the standard minimum in front of panels and other electrical equipment operating at that voltage class, assuming standard clearance conditions apply.
A feeder supplies a 100-amp panel with a calculated neutral load of 60 amps. Can the neutral conductor be sized smaller than the ungrounded conductors? Answer: Yes, in most cases. The neutral only has to carry the maximum unbalanced load, so it can be sized to the calculated neutral load (in this case, sized for 60 amps) rather than matching the 100-amp ungrounded conductors, as long as it still meets minimum grounding and equipment grounding conductor requirements.
What’s the main practical difference between a master electrician license and a journeyman license? Answer: A journeyman can perform electrical work under a master’s supervision or a licensed contractor. A master electrician can pull permits, design systems, and take legal responsibility for the work, which is why the exam leans harder on calculations and design-level code knowledge.

How Should You Actually Use a Practice Test to Prepare?

Run your first practice set open book, exactly like the real exam, so you build the habit of finding the right table fast instead of memorizing numbers you might misremember under pressure. Time yourself on a full mock exam that matches your state’s real item count and minutes, not a 20-question warmup, so you know whether pacing is your real problem. Tab your code book before you start studying, not the week before the exam, since fumbling for a table during a timed section costs real minutes.

Once you’ve run a few timed sets, work through more scored questions in the AmpExam free practice quiz to see how your accuracy holds up across the same content buckets your state board actually tests.

If you want a structured walkthrough of every calculation type on this list, plus more like it, the AmpExam master electrician study guide breaks the whole exam down section by section with worked math, not just answer keys.

FAQ

Is the master electrician exam open book? Yes, in most states, including Texas. You bring your own current-edition NEC book, and it can be tabbed with the publisher’s own index tabs before the test, but you can’t write in it or add loose notes during the exam session itself.

How many times can you retake the exam if you fail a portion? In Texas, you can retake either portion as many times as needed within your eligibility window, and you pay the same fee each time. Other states cap the number of attempts per year, so check your own board’s retake policy before you assume unlimited retakes.

Do you need a journeyman license before you can sit for the master exam? Yes, in nearly every state. Texas requires at least two years holding a Journeyman Electrician license plus 12,000 documented hours under a licensed master before you’re even eligible to schedule the master exam.

Is a free practice test enough to pass the real exam? On its own, usually not. Free questions build speed on definitions and common calculations, but they rarely replicate the two-portion timing and scored content breakdown of the real exam. Pair free practice with at least one full-length, timed mock exam before test day.

Do all states require a separate master electrician license? No. Licensing structure varies by state, and a few, most notably New York and Illinois, leave electrical licensing to individual cities and counties rather than a statewide board. Always confirm your own jurisdiction’s rule before assuming the three-tier apprentice, journeyman, master structure applies where you live.

Bottom line: a free practice test is a good first step, not a full substitute for a timed, full-length mock exam that matches your state’s real format. Know your state’s item counts, timing, and passing score before you schedule anything, and use the worked questions above to find out whether calculations or code knowledge is your weaker area.

We’re not affiliated with TDLR, PSI, or any state licensing board. Confirm your own state’s exam format and fees on your board’s official page before you register.