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MASTER NEC 2023

Master Electrician Practice Test - Special Occupancies & Advanced Wiring

Master electrician practice test covering special occupancies: marinas, RV parks, agricultural buildings, swimming pools, theaters, aircraft hangars, carnivals, health care, fuel dispensing, and hazardous classified locations.

TOPICS COVERED

Marinas RV Parks Agricultural Mobile Homes Aircraft Hangars Theaters

How this test works

Read each question carefully

Look for absolute words like always / never — they often distinguish the right answer.

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You have 45 min for 26 questions. Skip tough ones and come back.

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Frequently Asked Questions

Yes — completely free with no signup required. All answers include detailed explanations.

Requirements vary by state but typically include 4–8 years of documented electrical work experience plus a valid Journeyman license.

Advanced NEC code interpretation, load calculations, service entrance design, motor controls, generator systems, and electrical system design.

The Master exam focuses more on design, calculations, and planning rather than installation details. Load calculation and service sizing questions are weighted heavily.

How to Use This Practice Test

This Master Electrician Practice Test - Special Occupancies & Advanced Wiring has 26 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: Focus on multi-step calculations. Write each step on scratch paper — one math error means a wrong answer.

Topics covered: Load calculations, transformer sizing, three-phase circuits, service entrance, and special occupancies.
Passing score: 70–75% (most states). Master exams are calculation-heavy — practice the math, not just the lookup.
Questions: 26 multiple-choice, one correct answer each

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Master Electrician Practice Test - Special Occupancies & Advanced Wiring — Question List

Question 1: Marinas, boatyards, and boat basins fall under which NEC article?

Article 430
Article 547
Article 553
Article 555

NEC Reference: NEC Article 555

Question 2: Each boat slip at a marina that has shore power outlets must have its own disconnecting means. Where must this disconnect be located?

On the dock at the slip, readily accessible to that slip
In the marina office only
Inside the main service panel at the head of the dock
On the boat itself at the shore power inlet

NEC Reference: NEC 555.17

Question 3: Receptacles that provide shore power at a marina dock must have which type of protection?

AFCI protection
GFCI protection
Surge protection
No special protection required

NEC Reference: NEC 555.19(B)(1)

Question 4: What is the minimum power outlet required at each recreational vehicle site in an RV park?

A 15A, 125V general outlet is all that is required
At least one 20A, 125V outlet plus a 30A or 50A RV receptacle
A 60A, 240V outlet only
No minimum outlet requirement — owner decides

NEC Reference: NEC 551.77

Question 5: In a building that houses livestock, receptacles and equipment within what height above the floor must have GFCI protection?

1 meter (3.3 feet)
1.8 meters (6 feet)
2.5 meters (8.2 feet)
3 meters (10 feet)

NEC Reference: NEC 547.5(G)

Question 6: Agricultural buildings with metallic livestock confinement equipment (stalls, pens) must have an equipotential plane. What is the main reason for this requirement?

To reduce lightning strike damage to the building
To keep all metal parts at the same voltage and prevent stray voltage from stressing animals
To provide a low-resistance path for short circuit current
To replace the need for grounding electrodes in wet soil

NEC Reference: NEC 547.10

Question 7: What is the minimum power supply that a mobile home park must provide at each lot?

A 20A, 120V general purpose outlet
At least a 30A, 120/240V listed mobile home receptacle
A 100A, 240V service panel
Any outlet size — no minimum is specified

NEC Reference: NEC 551.73

Question 8: In an aircraft hangar used for storage and repair (not during fueling), the floor area up to how many inches above the floor is classified as Class I, Division 2?

6 inches
12 inches
18 inches
36 inches

NEC Reference: NEC 513.3(B)

Question 9: Below-grade pits in an aircraft hangar are classified as:

Unclassified — pits are considered sealed from the main hangar floor
Class I, Division 2 throughout the pit
Class I, Division 1 inside the pit; Class I, Division 2 extending 3 feet from the pit edge
Class II, Division 1 due to the enclosed space

NEC Reference: NEC 513.3(C)

Question 10: Portable stage cables and cords used in theaters must be rated for what type of service?

Light-duty service — stage use is low voltage
Hard usage or extra-hard usage (listed stage cable)
Any flexible cord rated for the voltage
Type NM cable pulled through the stage floor

NEC Reference: NEC 520.68(A)

Question 11: For a permanently installed swimming pool at a house, receptacles that are located between 6 feet and 20 feet from the pool edge must have:

AFCI protection
GFCI protection
Tamper-resistant protection only
No special protection — the 6-foot rule is all that applies

NEC Reference: NEC 680.22(A)

Question 12: The branch circuit supplying the pump motor for a permanently installed swimming pool must include:

AFCI protection
GFCI protection
A dedicated 30A circuit with no other loads
A time clock with GFPE at the panel

NEC Reference: NEC 680.21(C)

Question 13: The pool diagram shows a wet-niche luminaire installed in the pool wall 18 inches below the waterline. What is the maximum voltage allowed between conductors for a wet-niche pool luminaire?

Swimming pool cross-section showing a wet-niche luminaire in the pool wall with conductor routing

120V
150V
240V
No limit — the fixture listing determines the voltage

NEC Reference: NEC 680.23(B)(1)

Question 14: The equipotential bonding grid for a permanently installed swimming pool must use a solid copper conductor no smaller than:

12 AWG stranded copper
10 AWG solid copper
8 AWG solid copper
6 AWG stranded aluminum

NEC Reference: NEC 680.26(B)(2)

Question 15: At carnivals, fairs, and traveling shows, all 125V, 15A and 20A general-use receptacles must have:

AFCI protection
GFCI protection
Tamper-resistant protection
No special protection — temporary use is exempt

NEC Reference: NEC 525.23(A)

Question 16: Flexible cords and cables used to power rides and equipment at carnivals and fairs must be rated for:

Light use only — carnival voltages are low
Any listed flexible cord rated for the voltage and current
Hard-usage or extra-hard-usage service
Type NM cable only — flexible cords are not allowed outdoors

NEC Reference: NEC 525.20(B)

Question 17: A hospital essential electrical system must be divided into three separate branches. What are those three branches?

Emergency, standby, and optional standby
Life safety, critical, and equipment branches
Primary, secondary, and tertiary circuits
Normal power, backup power, and UPS circuits

NEC Reference: NEC 517.30(B)(1)

Question 18: The life safety branch of a hospital emergency system must automatically transfer to backup power within how many seconds of a normal power outage?

5 seconds
10 seconds
30 seconds
60 seconds

NEC Reference: NEC 517.31

Question 19: An orange receptacle in a hospital patient care area is called an isolated-ground receptacle. What is it used for?

To provide GFCI protection for medical equipment
To reduce electrical noise on the ground path for sensitive medical equipment
To mark 20A circuits so staff know they are on the critical branch
To allow the use of 240V equipment at a standard 120V outlet

NEC Reference: NEC 517.16

Question 20: How many receptacles must be installed at a minimum for each patient bed in a Category 1 (critical care) patient bed location?

4 receptacles
6 receptacles
8 receptacles
12 receptacles

NEC Reference: NEC 517.18(B)

Question 21: The service entrance diagram shows a 480Y/277V, solidly grounded wye service rated at 1200A. Does this service require ground-fault protection of equipment (GFPE), and if so, why?

Service entrance diagram showing 480Y/277V, 1200A solidly grounded wye service with main switchboard

No — GFPE is only required on 120/240V services
Yes — the voltage to ground exceeds 150V and the service is 1000A or more
No — GFPE is optional on any service over 600V
Yes — all services over 800A require GFPE regardless of voltage

NEC Reference: NEC 230.95

Question 22: In a Class I, Division 1 hazardous location, motor enclosures must be rated as:

Weatherproof (NEMA 3R)
Drip-proof (open frame is fine)
Explosion-proof (listed for the gas or vapor group)
GFCI protected — no special enclosure needed

NEC Reference: NEC 501.125(A)

Question 23: A Class III hazardous location is one that has a risk of fire or explosion from:

Flammable gases or vapors
Combustible metal dust
Easily ignitible fibers or flyings (cotton lint, textile dust)
Explosive chemicals stored in sealed containers

NEC Reference: NEC 500.5(D)

Question 24: At a service station, the outdoor area within 18 inches above the ground and within 20 feet horizontally from a gasoline dispenser is classified as:

Unclassified — outdoor air dilutes the vapors sufficiently
Class I, Division 1
Class I, Division 2
Class II, Division 2

NEC Reference: NEC Table 514.3(B)(1)

Question 25: In a Class I, Division 1 classified area, sealing fittings in conduit runs must be installed within how many inches of an enclosure where the conduit enters or exits?

6 inches
12 inches
18 inches
36 inches

NEC Reference: NEC 501.15(A)(1)

Question 26: In a Class I, Division 2 area, where are sealing fittings required on conduit runs?

Within 18 inches of every enclosure, same as Division 1
At the boundary where conduit crosses from the classified area to an unclassified area
Sealing fittings are not required in Division 2 areas
Only at the main service panel — one seal per building

NEC Reference: NEC 501.15(B)(2)

Key NEC References for This Test

Article	What It Covers
Art. 220	Load Calculations — optional and standard methods for multifamily
Art. 230	Services — service design, sizing, multiple disconnects
Art. 430	Motors — complete branch circuit design (conductor + OCPD + overload + disconnect)
Art. 445	Generators — standby systems, transfer switches
Art. 450	Transformers — sizing, primary/secondary OCPD, installation
Art. 706	Energy Storage Systems — battery/solar storage (major NEC 2026 expansion)

Study Tip: Practice transformer kVA calculations daily. Know the formula: I = kVA × 1000 ÷ (V × 1.732) for three-phase. This comes up on almost every master exam.

Master Electrician Practice Test - Special Occupancies & Advanced Wiring

How this test works

Frequently Asked Questions

How to Use This Practice Test

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Key NEC References for This Test

Master Electrician Practice Test - Special Occupancies & Advanced Wiring

How this test works

Frequently Asked Questions

Is this Master Electrician Practice Test - Special Occupancies & Advanced Wiring free?

How do I qualify for the Master Electrician exam?

What is covered on the Master Electrician exam?

How is the Master exam different from the Journeyman exam?

How to Use This Practice Test

Student Reviews

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Master Electrician Practice Test - Special Occupancies & Advanced Wiring — Question List

Question 1: Marinas, boatyards, and boat basins fall under which NEC article?

Question 2: Each boat slip at a marina that has shore power outlets must have its own disconnecting means. Where must this disconnect be located?

Question 3: Receptacles that provide shore power at a marina dock must have which type of protection?

Question 4: What is the minimum power outlet required at each recreational vehicle site in an RV park?

Question 5: In a building that houses livestock, receptacles and equipment within what height above the floor must have GFCI protection?

Question 6: Agricultural buildings with metallic livestock confinement equipment (stalls, pens) must have an equipotential plane. What is the main reason for this requirement?

Question 7: What is the minimum power supply that a mobile home park must provide at each lot?

Question 8: In an aircraft hangar used for storage and repair (not during fueling), the floor area up to how many inches above the floor is classified as Class I, Division 2?

Question 9: Below-grade pits in an aircraft hangar are classified as:

Question 10: Portable stage cables and cords used in theaters must be rated for what type of service?

Question 11: For a permanently installed swimming pool at a house, receptacles that are located between 6 feet and 20 feet from the pool edge must have:

Question 12: The branch circuit supplying the pump motor for a permanently installed swimming pool must include:

Question 13: The pool diagram shows a wet-niche luminaire installed in the pool wall 18 inches below the waterline. What is the maximum voltage allowed between conductors for a wet-niche pool luminaire?

Question 14: The equipotential bonding grid for a permanently installed swimming pool must use a solid copper conductor no smaller than:

Question 15: At carnivals, fairs, and traveling shows, all 125V, 15A and 20A general-use receptacles must have:

Question 16: Flexible cords and cables used to power rides and equipment at carnivals and fairs must be rated for:

Question 17: A hospital essential electrical system must be divided into three separate branches. What are those three branches?

Question 18: The life safety branch of a hospital emergency system must automatically transfer to backup power within how many seconds of a normal power outage?

Question 19: An orange receptacle in a hospital patient care area is called an isolated-ground receptacle. What is it used for?

Question 20: How many receptacles must be installed at a minimum for each patient bed in a Category 1 (critical care) patient bed location?

Question 21: The service entrance diagram shows a 480Y/277V, solidly grounded wye service rated at 1200A. Does this service require ground-fault protection of equipment (GFPE), and if so, why?

Question 22: In a Class I, Division 1 hazardous location, motor enclosures must be rated as:

Question 23: A Class III hazardous location is one that has a risk of fire or explosion from:

Question 24: At a service station, the outdoor area within 18 inches above the ground and within 20 feet horizontally from a gasoline dispenser is classified as:

Question 25: In a Class I, Division 1 classified area, sealing fittings in conduit runs must be installed within how many inches of an enclosure where the conduit enters or exits?

Question 26: In a Class I, Division 2 area, where are sealing fittings required on conduit runs?

Key NEC References for This Test

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