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MASTER NEC 2023

Master Electrician Practice Test - Code Application & Coordination

Master Electrician practice test on code application across articles: hazardous locations, health care, separately derived systems, bonding, GFP equipment, PV/ESS, communications, and selective coordination.

TOPICS COVERED

Hazardous Locations Health Care Grounding Bonding Working Space SPD

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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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 - Code Application & Coordination has 25 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: 25 multiple-choice, one correct answer each

Questions

45 min

Time

70%

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Timer starts immediately. Progress is auto-saved.

Student Reviews 4.0 / 5 · 2 reviews

Nicole Hatch

The code application questions for master level are tough and they should be. A few of the questions I felt were worded a bit ambiguously but that might be realistic for how the actual exam reads. Good resource for advanced prep.

Nicole Hatch

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Student Reviews

4.0 (2 reviews)

Nicole Hatch

May 9, 2026

Nicole Hatch

May 9, 2026

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Master Electrician Practice Test - Code Application & Coordination — Question List

Question 1: Permitted wiring methods in a Class I, Division 1 location include all of the following EXCEPT:

Threaded rigid metal conduit
Type MI cable
Electrical metallic tubing (EMT)
Threaded steel intermediate metal conduit

NEC Reference: NEC 501.10(A)(1)

Question 2: In a Category 1 patient bed location of a hospital, minimum number of receptacles required per 517.18(B) is:

NEC Reference: NEC 517.18(B)

Question 3: A 75 kVA 480–208Y/120V transformer creates a separately derived system. The system bonding jumper is sized using:

Table 250.66
Table 250.102(C)(1)
Table 250.122
Table 310.16

NEC Reference: NEC 250.30(A)(1)

Question 4: A 1¼" metal gas piping system in a building is required to be bonded per 250.104(B). The bonding conductor is sized using:

Table 250.66
Table 250.122 (rating of circuit likely to energize the piping)
Same size as the largest service conductor
Same size as the GEC

NEC Reference: NEC 250.104(B)

Question 5: Working space depth in front of a 480Y/277V switchboard with exposed live parts on both sides of the working space is (Condition 3, Table 110.26(A)(1)):

3 ft
3.5 ft
4 ft
6 ft

NEC Reference: NEC Table 110.26(A)(1)

Question 6: Per Article 242, surge-protective devices are classified as:

Type 1 through Type 5
Class A through Class D only
Generic SPD without classification
Class I, II, III only

NEC Reference: NEC 242.2 / 242.10

Question 7: Per 700.32, emergency system OCPDs must be:

Selectively coordinated with all supply-side OCPDs
Sized at exactly 100% of the connected load
Limited to thermal-magnetic breakers
Tested annually only

NEC Reference: NEC 700.32

Question 8: A 100 kW generator output conductor must be protected by an OCPD rated not more than 115% of the nameplate current. This rule comes from:

445.13
230.79
240.21
250.30

NEC Reference: NEC 445.13

Question 9: Per 690.12, rapid shutdown of a roof-mounted PV array on a one-family dwelling must reduce voltages outside the array boundary to:

30V or less within 30 seconds
50V or less within 60 seconds
0V immediately
120V or less within 5 seconds

NEC Reference: NEC 690.12

Question 10: A 200A panel uses the 705.12(B)(3)(2) "120% rule". The panel main breaker is 200A and the bus is rated 200A. Maximum PV breaker size is:

20A
40A
60A
100A

NEC Reference: NEC 705.12(B)(3)(2)

Question 11: A residential ESS installed in a basement must have a disconnecting means located:

Readily accessible and at or near the ESS
In the attic only
Behind a sealed access panel
Inside the ESS enclosure only

NEC Reference: NEC 706.15

Question 12: Optical fiber cables are covered by:

Article 770
Article 800
Article 725
Article 760

NEC Reference: NEC Article 770

Question 13: Per 800.44, a CATV cable run aerially with a power conductor must be separated from the power conductor by at least:

6 inches
12 inches
18 inches
36 inches

NEC Reference: NEC 800.44

Question 14: Class 2 circuits are limited by:

Voltage and power output of the source
Conductor size only
Length of run only
OCPD upstream of the source only

NEC Reference: NEC Article 725

Question 15: Per 760.41, fire alarm circuit power supply must:

Be a dedicated branch circuit identified at the panelboard
Share with a general lighting circuit
Be backed up by GFCI
Be on the emergency system always

NEC Reference: NEC 760.41

Question 16: In the dwelling service-entrance diagram, the grounded service conductor is bonded to the equipment grounding system at:

Service entrance diagram showing the bonding location at the service equipment

The service equipment only (main bonding jumper)
Every subpanel in the dwelling
The meter base only
No bonding is required

NEC Reference: NEC 250.24(B)

Question 17: In a major repair garage, the floor space within how many inches above the floor is classified as Class I Division 2?

6 inches
12 inches
18 inches
36 inches

NEC Reference: NEC 511.3

Question 18: Per 230.95, ground-fault protection of equipment is required on solidly grounded wye services of more than 150V to ground rated:

400A or more
600A or more
1000A or more
2000A or more

NEC Reference: NEC 230.95

Question 19: The informational note in 215.2(A) recommends a feeder voltage drop limit of:

NEC Reference: NEC 215.2(A) IN

Question 20: A roof-mounted A/C unit must have a disconnecting means located per 440.14 within sight from the equipment OR:

Lockable in the open position per 110.25
Painted red
Inside the air handler enclosure
Hidden behind drywall

NEC Reference: NEC 440.14

Question 21: A 480V service has 25,000A available SCC. The minimum AIC rating of OCPDs at the service must be:

10,000A AIC
14,000A AIC
25,000A AIC or higher
No AIC rating required for service equipment

NEC Reference: NEC 110.9

Question 22: The equipotential bonding grid for a permanently installed swimming pool, per 680.26(B), uses a solid copper conductor of size:

Not smaller than 8 AWG solid copper
14 AWG stranded copper
12 AWG aluminum
Any size as long as bare

NEC Reference: NEC 680.26(B)

Question 23: In the panel schedule shown, circuit 11 is labeled "BR 1 Lights/Recep (AFCI)". A bedroom outlet on this circuit also serves the bath sink area within 6 ft. What protection is required at the bath outlet?

Panel schedule with bedroom AFCI circuit shared with a bath-adjacent outlet

AFCI only
GFCI only
Both AFCI and GFCI (combo or upstream)
No additional protection beyond the bedroom AFCI

NEC Reference: NEC 210.8(A)(7) / 210.12

Question 24: In the EMT cross-section shown, the three 6 AWG conductors are upgraded to 4 AWG THWN (area 0.0973 sq in each). Total conductor area now is approximately:

EMT cross-section with conductor sizing recalculation

0.24 sq in
0.31 sq in
0.40 sq in
0.50 sq in

NEC Reference: NEC Chapter 9 Tables 1, 4, 5

Question 25: A 30 kVA arc welder rated for nonautomatic duty cycle 60% has a primary current of 50A. Per 630.11(A), branch-circuit conductor ampacity is calculated using the multiplier:

0.55
0.78
1.00
1.25

NEC Reference: NEC Table 630.11(A)

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 - Code Application & Coordination

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How to Use This Practice Test

Student Reviews 4.0 / 5 · 2 reviews

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Master Electrician Practice Test - Code Application & Coordination — Question List

Question 1: Permitted wiring methods in a Class I, Division 1 location include all of the following EXCEPT:

Question 2: In a Category 1 patient bed location of a hospital, minimum number of receptacles required per 517.18(B) is:

Question 3: A 75 kVA 480–208Y/120V transformer creates a separately derived system. The system bonding jumper is sized using:

Question 4: A 1¼" metal gas piping system in a building is required to be bonded per 250.104(B). The bonding conductor is sized using:

Question 5: Working space depth in front of a 480Y/277V switchboard with exposed live parts on both sides of the working space is (Condition 3, Table 110.26(A)(1)):

Question 6: Per Article 242, surge-protective devices are classified as:

Question 7: Per 700.32, emergency system OCPDs must be:

Question 8: A 100 kW generator output conductor must be protected by an OCPD rated not more than 115% of the nameplate current. This rule comes from:

Question 9: Per 690.12, rapid shutdown of a roof-mounted PV array on a one-family dwelling must reduce voltages outside the array boundary to:

Question 10: A 200A panel uses the 705.12(B)(3)(2) "120% rule". The panel main breaker is 200A and the bus is rated 200A. Maximum PV breaker size is:

Question 11: A residential ESS installed in a basement must have a disconnecting means located:

Question 12: Optical fiber cables are covered by:

Question 13: Per 800.44, a CATV cable run aerially with a power conductor must be separated from the power conductor by at least:

Question 14: Class 2 circuits are limited by:

Question 15: Per 760.41, fire alarm circuit power supply must:

Question 16: In the dwelling service-entrance diagram, the grounded service conductor is bonded to the equipment grounding system at:

Question 17: In a major repair garage, the floor space within how many inches above the floor is classified as Class I Division 2?

Question 18: Per 230.95, ground-fault protection of equipment is required on solidly grounded wye services of more than 150V to ground rated:

Question 19: The informational note in 215.2(A) recommends a feeder voltage drop limit of:

Question 20: A roof-mounted A/C unit must have a disconnecting means located per 440.14 within sight from the equipment OR:

Question 21: A 480V service has 25,000A available SCC. The minimum AIC rating of OCPDs at the service must be:

Question 22: The equipotential bonding grid for a permanently installed swimming pool, per 680.26(B), uses a solid copper conductor of size:

Question 23: In the panel schedule shown, circuit 11 is labeled "BR 1 Lights/Recep (AFCI)". A bedroom outlet on this circuit also serves the bath sink area within 6 ft. What protection is required at the bath outlet?

Question 24: In the EMT cross-section shown, the three 6 AWG conductors are upgraded to 4 AWG THWN (area 0.0973 sq in each). Total conductor area now is approximately:

Question 25: A 30 kVA arc welder rated for nonautomatic duty cycle 60% has a primary current of 50A. Per 630.11(A), branch-circuit conductor ampacity is calculated using the multiplier:

Key NEC References for This Test

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