The Colorado Master Electrician Guide

What Is the Colorado Master Electrician License?

The master electrician license verifies that an electrician can design, install, alter and repair electrical systems in full compliance with the National Electrical Code (NEC) — and can take responsibility for that work. In Colorado, the license is regulated by the Department of Regulatory Agencies (DORA) through its State Electrical Board, and the exam is administered by PSI at computer-based testing centers. The master license is the top of Colorado's electrical licensing ladder: the credential that lets you run electrical work under your own authority, take responsibility for installations, and step beyond the journeyman scope of work.

You are already an experienced electrician — this is the step from installing under supervision to owning the design and compliance decisions on a job. The exam assumes journeyman-level command of the code before it tests the master-level judgment on top, which is why the blueprint leans so hard on grounding and bonding, services and feeders, and the calculation skills a master uses every day.

Eligibility: Board Approval Comes First

Colorado does not let you register for the master exam on your own. The DORA State Electrical Board must approve your application and confirm that your experience meets the state's requirements before PSI will let you schedule:

• Application first: submit your master electrician application and supporting documentation of your electrical experience to the board.
• Board review: the State Electrical Board evaluates your credentials against the eligibility rules in effect when you apply.
• Eligibility notice: once approved, you receive the go-ahead to register for the exam with PSI.
• Confirmation: the eligibility standard is set by the board, not by the exam vendor — Contact the Colorado Department of Regulatory Agencies (DORA) State Electrical Board for current fees and eligibility requirements.

Do not buy exam prep or book a test date before your application is approved. Confirm your eligibility with the board first — the approval is the gate that everything else hangs on.

Exam Format: 90 Questions, 240 Minutes, Reference-Provided Open Book

The Colorado Master Electrician exam is a single, computer-based session delivered by PSI:

• 90 scored questions in 240 minutes. Depending on the exam form, up to 10 additional unscored pretest items may appear, in which case up to 30 extra minutes are added to the session.
• 70% pass line with compensatory scoring. Your score is computed across the whole exam — there is no per-subject pass or fail, and a strong area can offset a weaker one so long as the overall result clears 70%.
• Reference-provided open book. The test center supplies your NEC reference and a formula page. You do not bring your own code, no other materials are allowed, and you may not mark the provided references.
• Online calculator provided. A calculator is built into the exam software for the calculation questions — no physical calculator is needed.

The open-book rules here are the opposite of most states, so read them twice: you do not bring the NEC — the center provides a clean copy at your station. Because it is clean (no personal tabs, no margin notes), the exam rewards electricians who know the structure of the code cold: which article covers which topic, where the tables live, and how the index and section numbering get you to the answer fast.

NEC Edition: 2026, Effective August 1, 2026

The PSI Candidate Information Bulletin for the Colorado master exam states that exam questions are consistent with the NEC 2023 and then, effective August 1, 2026, consistent with the NEC 2026. Through November 1, 2026, candidates may request the NEC 2023 reference book at the test center during the transition; after that date the NEC 2026 is the edition in force.

What this means for you: if you prepared with a 2023 copy and test after August 1, 2026, the questions follow the 2026 code — re-check the articles that changed between editions (grounding and bonding, overcurrent protection and renewable energy all saw meaningful revisions). When in doubt, confirm the edition in the current bulletin before you sit.

Official Subject Areas (90 Scored Items)

The board publishes the subject-area breakdown for the 90 scored items. Study time should track these weights:

The pattern is unmistakable: Grounding & Bonding (14) is the single heaviest subject, and with Services, Feeders & Branch Circuits (11) the two together account for more than a quarter of the scored items. Special Occupancies (9), Special Equipment (9) and Electrical Calculations (9) form the next tier — nearly a third more. Master the heavy columns first: grounding and bonding alone is worth more scored questions than Overcurrent Protection, Conductors & Cables, Raceways & Boxes and Electrical Devices combined.

Fees, Retakes & Scoring

• Exam fee: $78 for the master electrician exam.
• Retest fee: $73 per retake.
• Scoring: 70% pass line with compensatory scoring — the overall result across all subject areas is what counts, not a per-section threshold.
• Pretest items: up to 10 unscored questions may be included on your form (with up to 30 added minutes); you will not know which items are unscored, so treat every question seriously.
• Vendor: exams are delivered by PSI for the Colorado program (coelec) after the DORA State Electrical Board confirms your eligibility.

Because compensatory scoring means a retake is a full-exam reset against the whole blueprint, treat every attempt as a complete 90-question performance. There is no “just pass the heavy chapters” shortcut — but there is also no single subject that can sink you if the rest of your exam is strong.

How to Prepare

1. Confirm your board eligibility. Get your DORA State Electrical Board application approved before you invest in prep and book anything. The approval is the gate.
2. Train with the NEC 2026. The exam is consistent with the NEC 2026 effective August 1, 2026. Study from the 2026 edition and review the articles that changed from 2023 — grounding and bonding, overcurrent protection and renewable energy saw the biggest edits.
3. Rehearse reference-provided conditions. Colorado hands you a clean NEC at the center. Practice answering questions with a code you cannot pre-tab heavily — sharpen your index speed, section-number memory and table recall (Article 250 grounding, 230 services, 215 feeders, 210 branch circuits, 430 motors, 450 transformers).
4. Drill the heavy columns first. Grounding & Bonding (14), Services/Feeders/Branch Circuits (11), then the 9-question tier: Special Occupancies, Special Equipment and Electrical Calculations. Get those to exam-day speed before the 2–5 question subjects.
5. Do the calculations by hand with the on-screen tool. Service and feeder loads, grounding-electrode sizing, motor and transformer calcs and conduit fill carry their own weight. Practice with a basic calculator, not a phone, since the exam supplies an online calculator.
6. Simulate under exam conditions. Full-length, timed, 90-question runs in 240 minutes at least once a week in the final month, aiming comfortably past the 70% line.

Master Electrician Practice is built for exactly this exam: code-referenced questions aligned to the Colorado subject blueprint, full-length timed simulations of the 90-question format, complete open-book NEC theory and an AI tutor — practice the actual subject blueprint with our simulations so the real exam feels like a repeat. Start with free practice questions to feel the format, and create a free account to track your scores as you go.

Frequently Asked Questions

Ready to Earn the Colorado Master License?

The master license is the credential that lets you take full responsibility for electrical work in Colorado. Start with the official blueprint: learn the code with our Master Electrician NEC theory guides, try free Colorado Master practice questions, register free and see the all-inclusive pricing — one subscription covering the full Colorado blueprint and every state's master exam lines, so you never buy subject-area prep piece by piece.