For journeymen taking a state master electrician exam on the 2023 NEC
Master electrician: find your weakest subject area
Free Master practice: 10 questions, answers explained as you go, score by domain.
Full course $149: 292 practice questions, each explained. See the course
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Grounding and Bonding
A service with 350 kcmil copper conductors has a GEC that runs only to two driven ground rods. Table 250.66 would give 2 AWG copper for these service conductors. What is the largest GEC the rods require?
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Practice to the subject areas state master exams share, load and service calculations included, with the free 10-question check, explained as you answer it.
- No signup · No card
- Written to the areas state master exams share
- 10 questions, untimed
- Answers explained as you go
- Scored by domain
Want a timed run? Try the free 25-question mini-mock. The first 5 need no email.
Original practice material. Not affiliated with any state licensing board, PSI, Prov or NFPA.
How it works
- Answer 10 questions, freeUntimed. Check each answer to see why it's right, with a hint where one helps.
- See your score by domainBroken down by outline domain, with your weakest one named.
- Study what you missedAdd your email and exam date for a study plan, or practice at exam pace.
Want exam pace? Take the 25-question practice test (about 30 minutes)
The Master course
Available now · instant accessLearn the load calculations, service and feeder sizing and design rules master exams lean on, then prove it on timed 100-question practice exams.
- 12modules of lessonsEvery task on the outline
- 2timed practice exams100 questions in 240 minutes, full length at our estimate
- 292practice questionsEach one explained
- 1week-by-week study planSet to your exam date
Lug, your AI study assistant, comes with the Master course: a week-by-week plan from your exam date and weak areas, step-by-step walk-throughs and a weak-spot quiz. Up to 40 messages a day.
- My study plan: a week-by-week course from your exam date and weak areas, with today's set ready. Lose a week and I re-plan it
- Stuck on a question? Tap Walk me through it, Explain like I'm new or Show a worked example
- A quiz on your weak spots, your misses back on a spaced review, and explain it back to me to lock it in
- After 30 answers, I show you the patterns in your misses and a practice set for each one
- Exam week: a day-by-day plan for your last 7 days
See all 12 modules
- Definitions, general requirements and plans
- Electrical theory and calculations
- Branch circuits
- Dwelling load calculations
- Load calculations for other occupancies
- Services and feeders
- Overcurrent protection
- Grounding and bonding
- Conductors, cables, raceways and boxes
- Motors, generators and transformers
- Special occupancies and special equipment
- Utilization equipment, lighting, low voltage and safety
Instant access. Terms and refunds · Secure checkout by Stripe · Billed by Nori Software
Every answer comes with a full explanation.
AI study assistant
Ask Lug why an answer is right
AI study assistant
Lug AI
Lug is your AI study assistant. Answer a question, then ask Lug why.
Example
Why is that one wrong?
LugI'll show you why the right answer works, why each other option falls short, and where to look it up.
Example of how I explain. Answer question 1, then tap Ask Lug why. 3 free asks, 10 more with your email. I'm AI, so check important details against your references. Meet Lug
Exam at a glance
- Delivery
- Computer-based at vendor test centers; each state names its vendor
- Exam fee (not paid to us)
- Set by each state and vendor: Oklahoma $92 per portion, Virginia $125, Michigan $100, Utah $85 (8 Nov 2026)
- Retakes
- Set by each state: Michigan's bulletin says 2 attempts within 1 year and LARA's page says two failed attempts within two years; Oklahoma electrical retests wait 30 days; retakes cost the exam fee again
What it covers
The free 10-question check follows these domains, subject to the available practice questions.
Master electrician exam prep FAQ
How long is the free check?
The free check has 10 practice items, is untimed and takes about 12 minutes. You see the answer and explanation after each item.
Which states is this for?
Master electrician exams outside Texas that test the 2023 NEC. Each state sets its own exam, length and passing score, so check your state's candidate bulletin. Texas has its own master course on Bonding Jumper.
Is the check free?
Yes. You can start the check and see your score and weakest subject area for free, with no signup or payment. Your score in each subject area unlocks when you add your email.
What do I see after finishing?
You get your score, your weakest subject area and what the master electrician exam course holds for it. Add your email to see your score in each subject area and get a free study plan.
Where does the practice content come from?
Every question is original and written to the subject areas state bulletins share. We never reproduce NEC text, and each explanation cites the 2023 NEC article, section or table it relies on. The check does not predict your exam score or certification outcome.
How many questions are on the master electrician exam?
Each state sets its own count, time and passing score. Michigan's Master Electrician exam is 76 questions in 180 minutes, and Virginia's is 90 questions in 270 minutes. Your state's candidate bulletin gives yours.
What do I need to bring on exam day?
Every state bulletin we read makes the exam open book with the NEC edition the state tests. Rules on tabs, highlighting and calculators differ by state, so read your bulletin before exam day.
The Bonding Jumper app for iPhone and AndroidToday's questions and your study plan in your pocket. Bonding Jumper already works in your phone's browser today.
See it on your phoneMore free help
- Master exam guideFormat, domains, references and published sources in one page
- Free sample lesson
- Free flashcards
- Question of the day
- Print a class quiz (free PDF)9 practice questions with an answer key on page 2.
- Print the flashcards as cut-out cards (free PDF)The free flashcard sample, ready to cut and carry.
- TX Journeyman free 10-question check
- TX Master free 10-question check
- Journeyman free 10-question check
Add this check to your site
Give your students or members the free 10-question Master check on your own page. Copy this HTML with its attribution link. Scores open in a new tab on Bonding Jumper. Paste both lines; if your site strips scripts, the frame keeps a fixed height.