The complete Master Electrician exam guide

From journeyman to Master Electrician — the licensing path

A Master Electrician license is the credential that lets you design systems, pull permits, own a contracting business, and supervise other electricians. Every state board sets its own rules, but the typical path looks like this:

1. Hold a journeyman license. Most states require 2–4 years of active licensure before you can apply for the master tier.
2. Log advanced hours. Expect to show 4,000–12,000 additional hours of commercial, industrial, or design experience. Some of this can be supervisory or plan-review work.
3. Submit your application packet. This usually includes employer letters, insurance certificates, a contractor's bond, and sometimes a business-law exam prerequisite.
4. Schedule the exam. Book through PSI, Prometric, or your state vendor. Fees range from $100 to $300. Some states split the exam into a technical portion and a business / law portion.
5. Pass the written exam. Typically 80–120 questions over 5–6 hours, open-book on the NEC. Passing scores are usually 75% or higher.
6. Activate your contractor license. Pay the licensing fee, maintain bonding / insurance, and you're cleared to operate as a Master Electrician or Electrical Contractor.

What's on the Master Electrician exam?

The master exam builds on journeyman knowledge but adds design-level responsibility. Expect fewer simple code lookups and more chained, multi-step problems. Here are the core buckets:

• Advanced load calculations (Article 220) — 15–20%. Multi-family dwellings, commercial services, optional method calculations (220.84), and farm loads. This is the single highest-value topic on the test.
• Services, feeders, and branch circuits (230, 215, 210) — 12–16%. Service-entrance conductor sizing, disconnecting means, and overcurrent protection coordination.
• Grounding & bonding at scale (250) — 10–14%. Separately derived systems, grounding electrode conductors for large services, and bonding of metal piping systems.
• Transformers & transformer protection (450) — 8–12%. Primary and secondary overcurrent protection, transformer vault requirements, and K-factor / harmonic considerations.
• Motor circuits & control (430, 440) — 8–10%. Multi-motor branch circuits, combination starters, and across-the-line vs. reduced-voltage starting.
• Special occupancies & hazardous locations (500, 501, 511, 517, 680) — 6–10%. Class I, II, and III divisions, healthcare essential electrical systems, and swimming-pool equipotential bonding.
• Business, law & supervision — 5–10%. Contractor licensing law, worker's comp, lien rights, permit processes, and NFPA 70E safety obligations. Only tested in some states.
• Electrical theory & advanced math — 10–15%. Three-phase power, power-factor correction, voltage-drop for long feeders, and fault-current calculations.

Master-level NEC topics you can't skip

These articles separate passing master candidates from journeyman-level thinkers. Drill them until the logic is automatic:

• Article 220 — Optional and standard load methods. Know when to use 220.82 (single-family optional) vs. 220.84 (multifamily optional) and how to apply demand factors for dryers, ranges, and HVAC.
• Article 230 — Service sizing & location. Understand the difference between service drop, lateral, and entrance conductors. Be able to size each for a given calculated load.
• Article 250 — Grounding electrode system design. For services over 1,000A, know how to size the grounding electrode conductor using Table 250.66 and when to parallel conductors (250.122(F)).
• Article 310 — Conductor ampacity with adjustments. Master exams love bundling questions: ambient temperature correction + conduit fill adjustment + derating for more than three current-carrying conductors.
• Article 450 — Transformer protection. Know primary and secondary OCPD sizing, the 125% rule, and when transformer secondary protection is not required (450.3(B)).
• Chapter 9 Tables — Raceway & box fill. Speed-run Table 1 (conduit fill), Table 4 (conduit dimensions), and Annex C (conduit fill for compact conductors).

A 12-week Master Electrician study plan

• Weeks 1–3: Load calculations deep dive. Two hours a day on Article 220. Work every example in the NEC Annex D. Practice dwelling, multifamily, and commercial loads until you can finish a full service calculation in under 20 minutes.
• Weeks 4–5: Transformers & motor circuits. Articles 430, 440, 450. Size branch circuits, feeders, and overcurrent protection for multi-motor installations.
• Weeks 6–7: Grounding, bonding, and special occupancies. Article 250 plus 500-series and 680. Focus on design decisions (where to bond, what size conductor) rather than rote lookups.
• Weeks 8–9: Mixed calculation blocks. 30–40 questions per day chaining 2–3 articles together (e.g. calculate load → size conductors → size grounding electrode conductor).
• Week 10: Business & law module. If your state tests it, review contractor law, lien rights, insurance minimums, and permit timelines.
• Week 11: Timed mock exams. Two full 5-hour simulations under exam conditions. Review every wrong answer and re-solve it cold the next day.
• Week 12: Rest and refresh. Light review, retab any lookups you hesitated on, and get plenty of sleep before exam day.

State-specific master license gotchas

Master requirements vary more than journeyman rules. Double-check your state board before you apply:

• Texas — Allows a direct master path with 12,000 verified hours (no journeyman prerequisite). Exam covers TX state amendments and business law.
• California — The C-10 contractor license is separate from the electrician certification. You must pass the CSLB trade exam plus a business / law exam.
• Florida — Master / contractor licensing is often county-level. Some counties require a local business tax receipt in addition to the state EC license.
• New York — NYC issues its own master license through the Department of Buildings; upstate boards are separate.
• Illinois — No state-level license; every municipality (Chicago, Springfield, etc.) issues its own master electrician credential.