- What the CO-ME Exam Actually Tests
- Registration, Fees, and Test-Day Mechanics
- The 13 Domains, Ranked by Weight
- Building a Study Plan Around Question Weight
- What You Can (and Can't) Bring Into the Test Center
- Meeting Eligibility Before You Sit for the Exam
- Passing Score and What It Means for Your Prep
- After You Pass: License, Renewal, and CE Hours
- Frequently Asked Questions
- The CO-ME exam is 90 scored questions in 240 minutes; you need 63 correct (70%) to pass.
- Grounding and Bonding carries the most weight at 14 questions - study it first and hardest.
- Initial exam fee is $78; a retest costs $73, administered by PSI Services LLC for DORA.
- NEC 2026 references apply on the exam effective August 1, 2026 per the PSI bulletin update.
What the CO-ME Exam Actually Tests
The Colorado Master Electrician License Exam, administered on behalf of the Colorado State Electrical Board (part of the Colorado Department of Regulatory Agencies, or DORA) through PSI Services LLC, is a computer-based, multiple-choice examination. It's built to confirm that a candidate can independently plan, lay out, and supervise electrical installations at a level beyond what's expected of a journeyman electrician. This isn't a generic trade quiz - it's a scenario-driven test of NEC application, load calculations, and code-based judgment calls that master electricians make daily on the job.
If you're just getting oriented, the What Is CO-ME? overview and the CO-ME Meaning breakdown are good starting points before you dive into domain-level prep.
Registration, Fees, and Test-Day Mechanics
Before you can sit for the exam, DORA's Electrical Board requires that your application and experience or education documentation be approved. Once you're cleared, PSI handles scheduling and delivery. The initial examination fee is $78; if you don't pass on the first attempt, a retest costs $73. These are separate from any application fees charged directly by DORA, so budget for both phases of the licensing process - a detail covered in more depth in the CO-ME Certification Cost 2026: Complete Pricing Breakdown guide.
PSI's candidate bulletin, last updated June 18, 2026, confirms that the exam references the NEC 2026 edition effective August 1, 2026. If you're studying from an older code book or an outdated question bank, you're preparing for the wrong exam. Confirm your reference edition against the current bulletin before you commit to a study source, and check the CO-ME Exam Dates 2026: Testing Windows, Deadlines & Scheduling page for how testing windows line up with the code transition.
Key Takeaway
Schedule your exam only after confirming which NEC edition applies to your test date - sitting a week on either side of the August 1, 2026 cutover could mean studying the wrong code cycle.
The 13 Domains, Ranked by Weight
The CO-ME exam spreads its 90 scored questions across thirteen content domains, and the allocation is not even. Knowing exactly how many questions come from each area lets you triage your study time instead of spreading effort evenly across topics that carry very different weight. For a full walkthrough of each domain's subtopics, see the CO-ME Exam Domains 2026: Complete Guide to All 13 Content Areas guide. Here's the official scored-item breakdown:
| Domain | Scored Questions |
|---|---|
| Grounding and Bonding | 14 |
| Services, Feeders, and Branch Circuits | 11 |
| Special Occupancies | 9 |
| Special Equipment | 9 |
| Electrical Calculations | 9 |
| Motors | 8 |
| General Electrical Knowledge | 6 |
| Overcurrent Protection | 5 |
| Raceways and Boxes | 5 |
| Conductors and Cables | 4 |
| Electrical Devices | 4 |
| Transformers | 4 |
| Special Conditions | 2 |
Two domains - Grounding and Bonding, and Services, Feeders, and Branch Circuits - together account for 25 of the 90 scored questions, more than a quarter of the exam. Treat these as your foundation, not an afterthought.
Grounding and Bonding (14 questions - largest domain)
This domain tests whether you understand the difference between grounding and bonding conductors, sizing methods, and how grounding electrode systems interact with services and separately derived systems.
- Grounding electrode conductor and bonding jumper sizing tables
- Equipment grounding conductor requirements across raceway and cable types
- Bonding of metal water piping, structural steel, and separately derived systems
Services, Feeders, and Branch Circuits (11 questions)
Expect scenario questions on service sizing, feeder tap rules, and branch-circuit load calculations that require you to move between NEC tables and formulas quickly.
- Service disconnect and load calculation basics
- Feeder and branch-circuit conductor sizing and derating
- Continuous versus noncontinuous load treatment
Electrical Calculations (9 questions)
This domain leans on the onscreen calculator and formula page supplied at the test center. Practice load, voltage drop, and demand factor math until it's automatic under time pressure.
- Demand factor application for dwelling and commercial loads
- Voltage drop calculations for feeders and branch circuits
- Motor and transformer full-load current calculations
Building a Study Plan Around Question Weight
A weighted study schedule beats an even one. Instead of dividing your prep time equally across all thirteen domains, allocate blocks proportional to scored-question counts, then reserve the final stretch for timed, full-length practice under the same 240-minute constraint you'll face on test day.
Grounding and Bonding + Services, Feeders, and Branch Circuits
- Work through grounding electrode and bonding jumper sizing tables until recall is automatic
- Drill service and feeder load calculations daily
Special Occupancies, Special Equipment, and Electrical Calculations
- Focus on hazardous locations, health care facilities, and equipment-specific NEC articles
- Practice demand factor and voltage drop math using an onscreen-style calculator
Motors, General Knowledge, Overcurrent Protection, Raceways
- Review motor circuit conductor and overload sizing rules
- Cover raceway fill calculations and box sizing
Lighter Domains + Full Timed Simulations
- Cover Conductors and Cables, Electrical Devices, Transformers, and Special Conditions
- Run at least two full 90-question, 240-minute practice sessions
This is the only place in this guide where general study methodology matters - and even here, it's anchored to CO-ME's specific weighting rather than a generic template. For a compact reference to carry through your final review week, bookmark the CO-ME Cheat Sheet 2026: One-Page Review of Must-Know Facts. You can also run full practice sessions on our practice test platform to get comfortable with the pacing before exam day.
What You Can (and Can't) Bring Into the Test Center
PSI test centers supply the NEC codebook and a formula/reference page for use during the exam - you don't bring your own copy. That supplied book, however, comes with strict limits: it cannot be pre-highlighted, underlined, tabbed, indexed, or written in. Personal reference materials of any kind are prohibited. An onscreen calculator is provided for the calculation-heavy questions.
This constraint is one of the reasons candidates consistently rate this exam more demanding than a straightforward knowledge test - for a deeper look at what makes it challenging, see How Hard Is the CO-ME Exam? Complete Difficulty Guide 2026.
Meeting Eligibility Before You Sit for the Exam
Colorado offers more than one path to sitting for the CO-ME exam, and understanding which one applies to you determines what documentation you submit with your application. Full eligibility details live in the CO-ME Requirements 2026: Eligibility, Prerequisites & How to Qualify guide, but the core pathways are:
- Experience-based route: 10,000 hours of qualifying electrical work over at least five years, including planning, layout, and supervision experience beyond standard journeyman duties.
- Education-based routes: Qualifying electrical-engineering degree graduates, and graduates of approved trade schools or community college electrical programs, may qualify through an alternate combination of education and experience.
Whichever path applies, you'll submit employer or master-level experience verification and, where relevant, transcripts from the approved program. Note that electrical contractor registration is a separate credential from the individual master electrician license - passing the exam and holding a license doesn't automatically register you as a contractor.
Key Takeaway
You sit for the exam before submitting your full DORA license application - but passing does not waive the underlying 10,000-hour experience or education requirement. Line up your documentation early so licensure isn't delayed after you pass.
Passing Score and What It Means for Your Prep
Colorado sets the passing threshold at 70%, or 63 correct answers out of the 90 scored questions. There is no separate pass requirement per domain - a weak showing in a small domain like Special Conditions (2 questions) won't sink you if you're strong across the higher-weighted domains. This is exactly why the weighted study approach above matters: since scoring is aggregate rather than domain-by-domain, your time is best spent shoring up Grounding and Bonding, Services/Feeders/Branch Circuits, and the other high-count domains rather than chasing an even split. For the full mechanics of how the score is calculated, read CO-ME Passing Score 2026: Exactly What You Need to Pass.
If you want context on how candidates generally perform against this threshold, the CO-ME Pass Rate 2026: What the Data Shows article covers what's publicly known - without relying on invented figures.
After You Pass: License, Renewal, and CE Hours
Passing the exam is a milestone, not the finish line. You still need to submit your completed application to DORA, along with the experience or education verification for your chosen pathway, before a master electrician license is issued. Once licensed, active licenses renew every three years and require 24 continuing-education hours per cycle, including at least four hours specifically on NEC changes and no more than four hours of safety content. The first renewal following a license issued by examination is exempt from this CE requirement. Keep your CE completion records for seven years in case of an audit.
If you're weighing whether the investment of time and fees is worthwhile relative to the career outcome, the Is the CO-ME Certification Worth It? Complete ROI Analysis 2026 article and the CO-ME Salary Guide 2026: Complete Earnings Analysis are useful companion reads. For where the license actually opens doors, browse CO-ME Jobs and consider structured CO-ME Training options to reinforce weak domains before your test date.
Frequently Asked Questions
The exam has 90 scored multiple-choice questions with a 240-minute time limit. Up to 10 additional unscored questions may appear, with 30 extra minutes allotted for them.
You need 70%, or 63 correct answers out of 90 scored questions. There is no separate passing requirement for individual domains - only the overall score matters.
No. The test center supplies the NEC and a formula page. Personal reference materials are prohibited, and the supplied book cannot be written in, highlighted, underlined, or indexed.
Grounding and Bonding, which carries 14 of the 90 scored questions - the largest single domain - followed by Services, Feeders, and Branch Circuits at 11 questions.
No. You must still submit your DORA application along with required experience verification (10,000 hours over five years) or qualifying education documentation. Passing the exam does not waive these requirements.
Preparing for the CO-ME exam comes down to respecting how the question allocation is actually structured, knowing exactly what you can and can't reference on test day, and lining up your eligibility paperwork so licensure follows quickly once you pass. Work through domain-weighted practice sets on our full practice test suite to build the speed and code-navigation habits this exam specifically rewards.