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Quizzes > Electronics & Gadgets

Massachusetts Class D Electrical License Quiz

Quick, free quiz to prep for the MA Class D electrical exam. Instant results.

Editorial: Review CompletedCreated By: Braulio UtreraUpdated Aug 27, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style electrical tools wiring safety helmet code book and MA Class D license quiz text on sky blue background

This quiz helps you check your knowledge for the Massachusetts Class D Electrical License, with questions on wiring, safety, and code. When you finish, build skills with an electrical practice test, try an electrical circuits quiz, or review with an electrical knowledge test to see where to focus next.

What is the maximum residential service amperage that a Massachusetts Class D licensed electrician may work on?
600 A
800 A
200 A
400 A
In Massachusetts, a Class D license permits electrical work on residential services up to 400 A. This limit is set by state regulations to distinguish between lighter residential work and heavier commercial or industrial applications. Exceeding this amperage requires a higher-level license.
What is the primary purpose of a Ground Fault Circuit Interrupter (GFCI)?
Reduce electrical harmonics
Regulate voltage to devices
Protect people from electric shock
Protect equipment from overloads
A GFCI monitors current balance between the hot and neutral conductors and quickly trips if an imbalance suggests current is flowing to ground through an unintended path, such as a person. It is primarily a life-safety device that reduces the risk of serious shock. GFCIs are required in wet or damp locations by the NEC.
Which minimum AWG copper conductor size is required for a 15 A residential branch circuit?
12 AWG
14 AWG
16 AWG
10 AWG
NEC Article 210.21(B)(1) specifies that a 15 A branch circuit must use a minimum of 14 AWG copper conductor. Using a smaller conductor could lead to overheating and potential fire hazards. Larger conductors may be used but are not required.
What color is used for equipment grounding conductors in residential wiring?
White
Black
Red
Green
Per NEC 250.119, equipment grounding conductors must be green or green with a yellow stripe. This color coding helps distinguish grounding conductors from hot or neutral conductors for safety and code compliance. Other colors are reserved for different functions.
Before working on a circuit, what is the first safety step an electrician should take?
Install a GFCI
Wear insulated gloves
Check the wiring diagram
Lockout/tagout to de-energize
The first step in electrical safety is to lock out and tag out the circuit to ensure it is de-energized before any work begins. This procedure prevents unexpected energization and protects workers from shock hazards. Wearing protective gear is important but secondary to securing de-energization.
The National Electrical Code (NEC) is updated every how many years?
4 years
5 years
3 years
2 years
The NEC is revised on a three-year cycle by the National Fire Protection Association to incorporate technological advances and improve safety standards. Adopting jurisdictions then may amend or delay adoption based on state or local requirements. Staying current with each cycle is critical for compliance.
A Massachusetts Class D license holder is permitted to install electrical wiring in which of the following?
High-rise commercial buildings
One- and two-family dwellings
Municipal street lighting
Industrial facilities
Massachusetts Class D licensees are limited to residential work, specifically one- and two-family dwellings. Commercial or industrial installations and public systems require higher license classifications. This scope is defined in 527 CMR 12.00.
What is the recommended maximum voltage drop on a branch circuit according to industry standards?
3%
10%
2%
5%
The recommended maximum voltage drop for branch circuits is 3% to ensure efficient operation of equipment and maintain voltage levels within acceptable ranges. Combined feeder and branch circuits should not exceed 5% total drop. Adhering to these limits improves energy efficiency and prevents undervoltage issues.
How many 20 A small-appliance branch circuits are required by the NEC for residential kitchens?
1
2
4
3
NEC 210.52(B) requires at least two 20 A small-appliance branch circuits to serve countertop outlets in kitchens. These circuits may not supply other outlets outside the kitchen area. This ensures adequate capacity for kitchen appliances.
What is the minimum separation required between overhead service conductors and a flat roof accessible only to qualified personnel?
12 ft
10 ft
8 ft
15 ft
NEC 230.24 sets minimum clearances for overhead service conductors above roofs. For roofs only accessible to qualified persons, the required clearance is 8 ft. Greater clearance is required for public access situations. Maintaining these distances prevents accidental contact.
Per NEC, if ground rods are the only grounding electrodes used for a dwelling, how many rods are required?
2 rods
1 rod
4 rods
3 rods
NEC 250.53(A)(2) requires two ground rods at a residence when rods are the sole grounding electrode. If the resistance of a single rod is 25 ohms or less, a second rod is still required for redundancy. This secures a reliable grounding system.
In a multiwire branch circuit, what feature must the overcurrent devices have?
Arc-fault protection
Time-delay fuses
Ground-fault protection
Handle tie or common trip
NEC 210.4(B) requires handle ties or a common trip for multiwire branch circuit breakers so that both ungrounded conductors disconnect simultaneously. This prevents overvoltages on the shared neutral and ensures safe de-energization.
What is the minimum burial depth for a PVC conduit in a residential installation?
24 inches
18 inches
12 inches
6 inches
NEC 300.5 specifies a minimum burial depth of 18 inches for PVC conduit in residential applications, assuming no vehicular traffic above. This depth protects the conduit from damage and meets safety requirements. Depth may increase where subject to traffic.
Which NEC article covers general requirements for wiring methods and materials?
Article 310
Article 250
Article 240
Article 300
NEC Article 300 outlines the general requirements for wiring methods, enclosures, and materials. It sets guidelines for installation, protection, and the environment to ensure safety. It is the foundational chapter for conduit, cable, and raceway installations.
According to NEC 310.15(B)(3)(a), what ampacity adjustment factor applies when five current-carrying conductors share the same raceway?
70%
80%
50%
60%
NEC Table 310.15(B)(3)(a) specifies a 80% ampacity factor for 4 - 6 current-carrying conductors in the same raceway. This derating prevents overheating due to reduced heat dissipation. Conductors must be sized larger to compensate.
What is the maximum fill percentage for a conduit containing three or more conductors by cross-sectional area?
60%
53%
40%
31%
NEC Chapter 9, Table 1 sets the maximum fill for three or more conductors at 40% of the conduit's internal cross-sectional area. This ensures enough space for heat dissipation and pulling conductors. Overfilling can damage insulation and compromise safety.
Which type of AFCI protection is required in bedroom branch circuits?
Branch/feeder AFCI only
Combination AFCI
Ground-fault AFCI
Supplementary AFCI
NEC 210.12(B) requires combination-type AFCI protection for bedroom receptacle and lighting branch circuits. Combination AFCIs detect series and parallel arcing faults. This higher protection level reduces fire risk.
What is the minimum size copper grounding electrode conductor for a 200 A service?
#6 AWG
#2 AWG
#4 AWG
#8 AWG
NEC Table 250.66 specifies that a 200 A copper service requires a minimum #4 AWG grounding electrode conductor to properly bond the service equipment to the grounding electrode system. Using smaller conductors could compromise the ground path.
In a 480 V three-phase wye system, what is the line-to-ground voltage?
120 V
480 V
240 V
277 V
In a 480 V wye system, the line-to-ground voltage is 480 V divided by ?3, which equals approximately 277 V. This relationship is fundamental for calculating equipment voltage ratings in three-phase systems.
What minimum conductor size is required for a continuous 30 A, 120 V load?
14 AWG
12 AWG
8 AWG
10 AWG
NEC 210.19(A)(1) dictates that continuous loads must be calculated at 125% of the load current, requiring a conductor rated at least 37.5 A. A #10 AWG copper conductor is rated for 30 A continuous and meets this requirement.
Which NEC article covers the installation and protection of transformers?
Article 300
Article 430
Article 440
Article 450
NEC Article 450 contains the rules governing the installation, overcurrent protection, and grounding of transformers. It addresses requirements for primary and secondary overcurrent protection and transformer vaults. Electricians must consult this article when working with transformer equipment.
What is the temperature correction factor for conductors when the ambient temperature is 40 °C, based on a 30 °C rating?
0.58
0.75
0.82
0.91
NEC Table 310.15(B)(2)(a) specifies a correction factor of 0.91 for conductors rated at 30 °C installed in a 40 °C ambient. This factor derates the conductor's ampacity to account for higher operating temperatures. Proper derating prevents overheating.
What is the maximum allowable resistance to earth ground for a ground rod in Massachusetts, as adopted by 527 CMR 12.00?
5 ?
25 ?
50 ?
100 ?
Massachusetts adopts the NEC requirement that a grounding electrode system must have a maximum resistance of 25 ? or less to earth. If a single rod exceeds 25 ?, additional electrodes must be added. This ensures an effective path for fault currents.
A Massachusetts Class D license holder is limited to installations on which electrical system?
120/240 V single-phase up to 400 A
600 V industrial
277/480 V three-phase
120/208 V three-phase
By regulation under 527 CMR 12.00, Class D electricians in Massachusetts may install and repair single-phase 120/240 V systems up to 400 A. Three-phase or higher-voltage systems require a Class B or C license. This scope limits work to typical residential services.
How often must a Massachusetts electrical license be renewed?
Annually
Every 3 years
Every 2 years
Every 5 years
Massachusetts requires all electrical licenses to be renewed every two years. Licensees must complete continuing education and submit renewal applications before the expiration date. Failure to renew can result in lapses and penalties.
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Study Outcomes

  1. Understand Wiring Fundamentals -

    Learn core principles of electrical circuit design, including conductor types, wiring methods, and load calculations crucial for the Massachusetts Class D Electrical License.

  2. Apply Electrical Code Standards -

    Interpret and apply key sections of the NEC and Massachusetts code requirements to real exam-style questions, ensuring compliance with class d electrical license MA requirements.

  3. Identify Safety Protocols -

    Recognize potential hazards and implement proper safety practices, from personal protective equipment to lockout/tagout procedures, to reduce risk on the jobsite.

  4. Analyze Wiring Diagrams -

    Decode schematic drawings and circuit layouts with confidence, improving your ability to troubleshoot and install electrical systems per code.

  5. Assess Exam Readiness -

    Evaluate your knowledge with targeted questions from our massachusetts class d license practice test, pinpointing strengths and areas for improvement before the ma electrical class d license exam.

  6. Gain Test-Taking Strategies -

    Adopt proven approaches for managing time and tackling multiple-choice questions effectively, boosting your chances of passing the Class D Electrical License quiz.

Cheat Sheet

  1. Ohm's Law & Power Calculations -

    Mastering E=IR and P=VI is essential for the Massachusetts Class D electrical license exam; for instance, a 120 V circuit with a 15 Ω load draws I=120/15=8 A. Remember P=VI to find power (e.g., P=120 V×8 A=960 W). This trio of formulas forms the backbone of many MA electrical class D license practice test questions.

  2. NEC Ampacity & Conductor Sizing -

    Refer to NEC Table 310.15(B)(16) to size conductors - 12 AWG copper is rated at 20 A, while 10 AWG copper handles 30 A. A handy mnemonic is "A Size Always Fits" to remind you that ampacity matches conductor size per NFPA 70. Proper sizing not only ensures code compliance but also prevents overheating on your ma electrical class d license exam.

  3. Circuit Protection & Overcurrent Devices -

    Under NEC Article 240, branch-circuit breakers and fuses must be selected to protect conductors and equipment; breakers typically trip on overloads while fuses melt on faults. Learn trip curves - Type B for lighting, Type C for general loads - to choose the right device. Skilled use of OCPDs is a frequent topic on class d electrical license ma tests.

  4. Grounding & Bonding Fundamentals -

    Per NEC Article 250, grounding electrodes (ground rods, water pipes) and equipment grounding conductors create low-impedance paths to dissipate faults. A mnemonic like "GEC Goes Earthward" helps recall that grounding electrode conductors bond the service panel to earth. Understanding this is critical for safe installations and often appears in ma electrical class d license practice test scenarios.

  5. Load Calculations & Service Requirements -

    Use NEC Article 220 to calculate demand loads: general lighting is 3 VA/sq ft (e.g., 2,000 sq ft×3 VA=6,000 VA), plus 120 V small-appliance circuits at 1,500 VA each with a 12.5% demand factor. Accurately sizing the service (e.g., 200 A vs. 400 A) ensures you meet customer needs without oversizing. These calculations are a staple of the class d electrician licensing ma exam.

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