200+ Free Master Electrician Practice Questions

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Question 1

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According to Ohm's Law, what is the current in a 120-volt circuit with a resistance of 24 ohms?

A. 2.5 amperes

B. 5 amperes

C. 10 amperes

D. 20 amperes

to track

2026 Statistics

Key Facts: Master Electrician Exam

70-75%

Passing Score

Most states

40-55%

Pass Rate

First-time

80-100

Questions

Typical exam

4-5 hrs

Time Limit

State-dependent

$100-250

Exam Fee

ICC/PSI/State

4+ years

Experience Required

Journeyman license

The Master Electrician exam has a 40-55% first-time pass rate in most states. The exam requires 70-75% to pass and covers 6-7 content domains based on the 2023/2026 NEC. Most states allow a bound copy of the current NEC during the exam. The exam emphasizes complex calculations including service load calculations, voltage drop, motor circuits, and conductor sizing. Experience requirements typically include 4+ years as a licensed journeyman electrician.

Sample Master Electrician Practice Questions

Try these sample questions to test your Master Electrician exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 200+ question experience with AI tutoring.

1According to Ohm's Law, what is the current in a 120-volt circuit with a resistance of 24 ohms?

A.A. 2.5 amperes

B.B. 5 amperes

C.C. 10 amperes

D.D. 20 amperes

Explanation: Ohm's Law states that I = V/R. With V = 120 volts and R = 24 ohms: I = 120/24 = 5 amperes. This fundamental formula is essential for all electrical calculations and is referenced throughout the NEC for circuit analysis and conductor sizing.

2What does the NEC define as a "continuous load"?

A.A. A load that operates for at least 8 hours per day

B.B. A load where the maximum current is expected to continue for 3 hours or more

C.C. Any load connected to a 480-volt system

D.D. A load that operates 24 hours per day, 7 days per week

Explanation: According to NEC Article 100 (Definitions), a continuous load is defined as "a load where the maximum current is expected to continue for 3 hours or more." This definition is critical for applying the 125% multiplier requirements found in NEC 210.19(A)(1) for branch circuits and NEC 215.2(A)(1) for feeders.

3In a standard 120/240-volt single-phase residential service, what is the phase relationship between the two ungrounded conductors?

A.A. They are in phase with each other

B.B. They are 180 degrees out of phase with each other

C.C. They are 120 degrees out of phase with each other

D.D. They are 90 degrees out of phase with each other

Explanation: In a single-phase 120/240-volt system derived from a center-tapped transformer, the two ungrounded (hot) conductors are 180 degrees out of phase. This phase relationship allows for 240 volts between the two ungrounded conductors while providing 120 volts from either ungrounded conductor to the grounded (neutral) conductor.

4What is the power consumed by a 20-ampere, 120-volt resistive load?

A.A. 1,440 watts

B.B. 2,400 watts

C.C. 4,800 watts

D.D. 6,000 watts

Explanation: Using the power formula P = I × V, where I = 20 amperes and V = 120 volts: P = 20 × 120 = 2,400 watts. For resistive loads (like heaters and incandescent lighting), the power factor is 1.0, so no power factor correction is needed. This calculation is fundamental for load calculations per NEC Article 220.

5What is the minimum size grounding electrode conductor required for a 200-ampere service using 2/0 AWG copper service conductors?

A.A. 8 AWG copper

B.B. 6 AWG copper

C.C. 4 AWG copper

D.D. 2 AWG copper

Explanation: According to NEC Table 250.66, for ungrounded service conductors sized 2/0 AWG or 3/0 AWG copper, the minimum grounding electrode conductor size is 6 AWG copper (or 4 AWG aluminum). This ensures adequate capacity to safely carry fault currents to the grounding electrode system.

6What is the maximum standard ampere rating for an overcurrent protective device that can protect a 14 AWG copper conductor?

A.A. 10 amperes

B.B. 15 amperes

C.C. 20 amperes

D.D. 25 amperes

Explanation: NEC 240.4(D)(2) specifies that unless specifically permitted in 240.4(E) or (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG copper conductors. This is a critical safety requirement to prevent conductor overheating and potential fire hazards.

7According to NEC 314.16, how many volume allowances are required for each yoke or strap containing one or more devices?

A.A. One volume allowance

B.B. Two volume allowances

C.C. Three volume allowances

D.D. Four volume allowances

Explanation: NEC 314.16(B)(4) states that for each yoke or strap containing one or more devices or equipment, a double volume allowance based on the largest conductor connected to the device(s) shall be counted. This means each switch, receptacle, or similar device mounted on a yoke counts as two conductor volumes.

8In a residential dwelling unit, what is the maximum spacing allowed between general-purpose receptacle outlets along a wall?

A.A. 6 feet

B.B. 8 feet

C.C. 10 feet

D.D. 12 feet

Explanation: NEC 210.52(A)(1) requires that in dwelling units, receptacles shall be installed such that no point measured horizontally along the floor line of any wall space is more than 6 feet (1.8 m) from a receptacle outlet. This equates to a maximum 12-foot spacing between receptacles, ensuring that a 6-foot appliance cord can reach a receptacle anywhere along the wall.

9What is the generally recommended maximum percentage voltage drop for a combination of branch circuit and feeder?

A.A. 2%

B.B. 3%

C.C. 5%

D.D. 10%

Explanation: NEC 210.19(A)(1) Informational Note No. 4 recommends that the maximum combined voltage drop for both feeders and branch circuits should not exceed 5%, with not more than a 3% drop in either the feeder or the branch circuit alone. While this is a recommendation and not a strict code requirement, it ensures efficient operation of electrical equipment.

10In a DC circuit with a 12-volt battery powering three 4-ohm resistors connected in series, what is the total circuit current?

A.A. 0.5 amperes

B.B. 1.0 amperes

C.C. 2.0 amperes

D.D. 3.0 amperes

Explanation: For series resistors, the total resistance is the sum: R_total = 4 + 4 + 4 = 12 ohms. Using Ohm's Law I = V/R = 12/12 = 1.0 amperes. In series circuits, current remains constant throughout while voltage divides across each resistor.

About the Master Electrician Exam

The Master Electrician License Exam is a state-level certification for experienced electricians who want to supervise electrical work, own electrical contracting businesses, and pull permits. The exam covers the National Electrical Code (NEC), electrical theory, service and feeder calculations, wiring methods, equipment installation, motors and generators, and special occupancies.

Questions

80 scored questions

Time Limit

4-5 hours

Passing Score

70-75%

Exam Fee

$100-250 (ICC / PSI / State Licensing Boards)

Master Electrician Exam Content Outline

20%

General Knowledge & Electrical Theory

NEC definitions, electrical theory, Ohms Law, AC/DC fundamentals, power factor, electrical calculations, and code structure

20%

Services & Service Equipment

Service load calculations, service entrance requirements, transformers, grounding and bonding, overcurrent protection, and disconnects

15%

Feeders & Branch Circuits

Feeder sizing, branch circuit design, conductor ampacity, voltage drop calculations, multi-wire circuits, and NEC Article 210-215

15%

Wiring Methods & Materials

Cable types (NM, MC, AC), conduit systems (EMT, RMC, PVC), box fill calculations, junction boxes, and installation requirements

15%

Equipment, Motors & Generators

Receptacles, switches, panelboards, GFCI/AFCI protection, motor calculations and protection, generator installations, emergency systems

15%

Special Occupancies

Hazardous locations (Class I, II, III), healthcare facilities, swimming pools, marinas, RV parks, fire pumps, NEC Articles 500-516, 680, 695

How to Pass the Master Electrician Exam

What You Need to Know

Passing score: 70-75%
Exam length: 80 questions
Time limit: 4-5 hours
Exam fee: $100-250

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Master Electrician Study Tips from Top Performers

1Master NEC Article 220 (Load Calculations) - service, feeder, and branch circuit calculations are heavily tested

2Study Article 250 (Grounding and Bonding) thoroughly - this is the foundation of electrical safety

3Practice motor circuit calculations including FLC, conductor sizing, overload protection, and short-circuit protection

4Memorize conductor ampacity tables (310.16) and understand temperature and bundling adjustment factors

5Study special occupancies in Articles 500-516 - hazardous locations are commonly tested

6Practice voltage drop calculations using both the approximate method and actual NEC formulas

7Learn to navigate the NEC index quickly - you will need to look up specific code references

8Focus on GFCI and AFCI requirements - know where they are required in different occupancies

Frequently Asked Questions

How hard is the Master Electrician exam?

The Master Electrician exam is challenging with first-time pass rates of 40-55% in most states. The exam requires extensive knowledge of the NEC, complex electrical calculations, and practical application of code requirements. Many candidates underestimate the depth of knowledge required for service calculations, motor circuits, and special occupancies. Thorough preparation with 200+ practice questions and hands-on code book study is essential.

What is the passing score for the Master Electrician exam?

Most states require 70-75% to pass the Master Electrician exam. Some jurisdictions may have slightly different requirements. The exam is typically divided into two portions: NEC Knowledge (code lookup and interpretation) and Calculations (mathematical applications for load calculations, voltage drop, conductor sizing). Both portions must typically be passed.

What experience is required to take the Master Electrician exam?

Most states require 4+ years of experience as a licensed journeyman electrician before qualifying for the Master Electrician exam. Some jurisdictions may accept equivalent experience such as electrical engineering degrees combined with field experience. Check with your state licensing board for specific requirements, as they vary significantly by jurisdiction.

Can I use a calculator and NEC code book during the exam?

Yes, most states allow a basic non-programmable calculator and a bound copy of the current NEC (2023 or 2026 edition) during the exam. No loose papers, tabs that can tear out, or handwritten notes are permitted. Some states may also allow additional reference materials like Uglys Electrical Reference. Always verify approved materials with your state board before the exam.

What NEC edition is used on the Master Electrician exam?

Most states have adopted the 2023 NEC, though some may still use the 2020 NEC. The 2026 NEC is being adopted by some jurisdictions starting in 2026. Key updates in recent editions include GFCI/AFCI expansion, surge protection requirements, and changes to renewable energy systems. Check with your state licensing board to confirm which edition is used for your exam.

How many questions are on the Master Electrician exam?

Most state Master Electrician exams contain 80-100 multiple-choice questions. The exam is typically divided into code knowledge questions and calculation questions. You generally have 4-5 hours to complete the exam, and time management is critical due to the complexity of calculations required.

What is the difference between a Journeyman and Master Electrician license?

A Journeyman Electrician can perform electrical work under the supervision of a Master Electrician but cannot own an electrical contracting business or pull permits independently. A Master Electrician can supervise other electricians, own an electrical contracting business, pull permits, and is legally responsible for electrical installations. Master Electricians typically earn 25-50% more than Journeymen and have greater career opportunities.