JOURNEYMAN NEC 2023 FULL-LENGTH PRO

Maryland Journeyman Electrician Practice Test - Full-Length Test 1

A full-length, 66-question practice exam covering all 8 core NEC topic areas, weighted the same way the real exam is. Modeled on Maryland's real licensing exam format. Premium — part of Full-Length Pro.

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Frequently Asked Questions

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Most state Journeyman exams have 80–100 questions covering NEC code, wiring methods, branch circuits, motor controls, and load calculations.

Most states require a 70–75% passing score. This practice test uses the same 70% pass threshold so you know where you stand.

Questions are written to the 2023 NEC. Check your state licensing board to confirm which edition your state has adopted.

How to Use This Practice Test

This Maryland Journeyman Electrician Practice Test - Full-Length Test 1 has 66 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: This is an open-book exam — tab your NEC index and Articles 210, 250, and 430 before you start.

Topics covered: Branch circuits, grounding, wiring methods, load calculations, and motors.
Passing score: 70–75% (most states). Aim for 80% on practice tests so the real exam feels easy.
Questions: 66 multiple-choice, one correct answer each

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Maryland Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: A nonautomatic arc welder has a 60% duty cycle and primary current of 50A. Table 630.11(A) gives a multiplier of 0.78 for 60% duty cycle. What is the minimum branch circuit conductor ampacity?

33A — using a 0.65 factor
39A — 50A × 0.78
44A — 50A × 0.89 (80% factor)
50A — no duty cycle reduction

NEC Reference: NEC 630.11(A)

Question 2: An electrician installs a motor according to all NEC rules, but the motor manufacturer instructions say to use a specific wiring method and conductor size that is more restrictive than what the NEC requires. Which takes precedence?

The NEC always overrides manufacturer instructions
The manufacturer installation instructions — they are part of the listing
Whichever is less expensive to install
The local building code, which supersedes both

NEC Reference: NEC 110.3(B)

Question 3: What shall be the maximum weight of the lightening fixture when it is supported only by the screw shell of the lamp holder?

4 pounds
6 pounds
8 pounds
10 pounds

NEC Reference: NEC 410.30(A)

Question 4: What is ampacity of 1/0 THWN conductor in a dry location at an ambient temperature of 104⁰ F if the raceway contains four 1/0 THWN conductors?

NEC Reference: NEC 310.15(B)(16)

Question 5: A single family dwelling unit has a connected load of 4000 VA. which of the following is the calculated demand load?

3350 VA
3550 VA
4000 VA
3850 VA

NEC Reference: NEC 220.42

Question 6: Which of the following is the ampacity of 4 AWG SE cable?

70 A
65 A
80 A
85 A

NEC Reference: NEC 338.10(B)

Question 7: What is the minimum feeder or service load for cloth dryers in a dwelling unit?

5000 watts
2800 watts
4500 watts
6500 watts

NEC Reference: NEC 220.54

Question 8: How many types of 4 wire feeders shall be permitted to utilize a common neutral?

NEC Reference: NEC 215.4

Question 9: How many maximum number of receptacles are permitted on — a 20 ampere breaker supplied by 120 volts power source in a shopping complex?

NEC Reference: NEC 220.14(I)

Question 10: The allowable ampacity of the branch circuit conductors shall be permitted to be not less than the sum of the continuous load plus ......................... load

non-continuous load
rated load
Maximum load

NEC Reference: NEC 210.19

Question 11: What are the maximum allowable service dis connectors consist for each service?

NEC Reference: NEC 230.71(A)

Question 12: Which of the following circuits shall not be connected to system containing trolley wires?

Circuits for lightening
Grounding wires
Ungrounded trolley wires
Bonding wires

NEC Reference: NEC 110.19

Question 13: 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 14: Which of the following is the maximum rating of a branch circuit that supply the primary of low voltage lighting system power supply?

20 amperes
25 amperes
15 amperes
30 amperes

NEC Reference: NEC 411.6

Question 15: A device box is mounted in a concrete block wall. How far can the front edge of the box be set back from the finished wall surface?

No setback allowed — the box must be flush
— inch maximum setback
— inch maximum setback
1 inch maximum setback

NEC Reference: NEC 314.20

Question 16: Show window load per 220.43(A) is calculated at not less than:

50 VA per linear foot
100 VA per linear foot
180 VA per linear foot
200 VA per linear foot

NEC Reference: NEC 220.43(A)

Question 17: A motor is in the basement and its disconnect is on the first floor where you cannot see the motor. What does the NEC allow in this situation?

A second disconnect must be installed at the motor
The disconnect must be capable of being locked in the open position
A warning label on the motor is sufficient
Nothing extra is needed as long as the disconnect is identified

NEC Reference: NEC 430.102(B)

Question 18: For a 300 ampere electrical circuit, what is the minimum size copper equipment grounding conductor as per NEC?

6 AWG
4 AWG
8 AWG
10 AWG

NEC Reference: NEC 250.122

Question 19: What is the minimum feeder/service conductor calculated load for an electrical sign?

15000 VA
12000 VA
18000 VA
10000 VA

NEC Reference: NEC 220.14(F)

Question 20: How many number of entrances should be provided to give access from working space about electrical equipment?

NEC Reference: NEC 110.26

Question 21: A metal underground water pipe is used as a grounding electrode. What additional requirement must be met?

The pipe must be at least 10 feet long in contact with the earth
At least one supplemental electrode must also be installed
The pipe must be bonded to every metallic water fixture in the building
The water company must be notified before using the pipe as an electrode

NEC Reference: NEC 250.53(D)(2)

Question 22: Per 220.61(C)(2), the feeder neutral load for non-linear (electric-discharge or harmonic-producing) loads is calculated at:

70% of the load above 200A
100% — no reduction permitted
50% of the total
125% of the load

NEC Reference: NEC 220.61(C)(2)

Question 23: The minimum headroom of the working space in front of a panelboard, switchboard, or motor control center must be at least:

6 feet
6.5 feet (2.0 m)
7 feet
8 feet

NEC Reference: NEC 110.26(A)(3)

Question 24: 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 25: Which of the following is the minimum size of fixture size that can use for wiring control circuits?

18 AWG
16 AWG
10 AWG
12 AWG

NEC Reference: NEC 402.6

Question 26: Without applying any de-rating factor for conductor current carrying capacity, how many conductors can run parallel in raceway or cable?

NEC Reference: NEC 310.15(B)(3)(a)

Question 27: In which of the following the panel boards must be enclosed?

Cut boxes
Cabinets
All options are correct
Enclosures designed for the purpose

NEC Reference: NEC 408.38

Question 28: A cable clamp inside a device box counts for how many conductor volumes in the box fill calculation?

Zero — clamps are part of the box hardware and are ignored
One conductor volume for all clamps combined
One conductor volume per clamp
Two conductor volumes regardless of clamp size

NEC Reference: NEC 314.16(B)(2)

Question 29: A 4800 watts electric motor is connected to 240 volts single phase supply, 2 wire circuit. what is the minimum size THW conductor that is required to supply the load?

14 AWG
12 AWG
10 AWG
8 AWG

NEC Reference: NEC 424.3(B)

Question 30: A 277/480V, 3-phase, 4-wire wye service in a commercial building is rated at 2000A. Per 230.95, does this service require ground-fault protection of equipment (GFP)?

No — GFP is only required on services above 2500A
Yes — voltage to ground exceeds 150V and the service rating is 1000A or more
No — 277/480V systems are exempt from the GFP requirement
Yes — GFP is required on all commercial services regardless of voltage

NEC Reference: NEC 230.95

Question 31: What is the corrected ampacity of a 2/0 THWN conductor in a dry location, If the ambient temperature of the location is 45⁰ C?

170 Amperes
188 Amperes
139 Amperes
160 Amperes

NEC Reference: NEC 310.15(B)(16)

Question 32: Mutli-wire branch circuits shall not be permitted in class I division I locations.

True
False

NEC Reference: NEC 501.40

Question 33: A motor nameplate shows FLA = 40A and service factor = 1.15. What is the highest trip setting allowed on the overload relay?

40A — match the FLA exactly
46A × 115% of FLA
50A × 125% of FLA
56A × 140% of FLA

NEC Reference: NEC 430.32(A)(1)

Question 34: For a 400A service with 600 kcmil copper conductors, what is the minimum GEC size per Table 250.66?

1/0 AWG copper
4 AWG copper
2 AWG copper
3/0 AWG copper

NEC Reference: NEC Table 250.66

Question 35: When one or more equipment grounding conductors or equipment bonding jumpers enters in a metal box can be considered as how many number of total conductors in a metal box?

single conductor
double conductor
half of the number of conductors

NEC Reference: NEC 314.16(5)

Question 36: What is the minimum size of THWN conductors required for single phase 10 HP motor — connected to 240 volts supply?

4 AWG THWN Copper
6 AWG THWN Copper
8 AWG THWN Copper
10 AWG THWN Copper

NEC Reference: NEC 430.248

Question 37: If the conduit is placed in hazardous locations, it must be made ...................... to prevent sparking when a fault current flows through it.

sealed
bonded
wrentchtight
rugged plastic

NEC Reference: NEC 500.8(E)

Question 38: A mechanical contractor wants to run a water supply pipe through the dedicated electrical space directly above a 200A panelboard. Is this permitted?

Yes — water pipe above the panel is fine as long as it does not drip
No — foreign systems including pipes are not permitted in the dedicated electrical space
Yes — but a drip shield must be installed above the panel
Yes — the pipe is permitted if it runs parallel to the panel, not over it

NEC Reference: NEC 110.26(F)(1)(b)

Question 39: If the replacement compressor motor draws 35 amperes current, what is the minimum rating for disconnecting means used to protect the motor?

40.25 amperes
42 amperes
38.5 amperes
43.75 amperes

NEC Reference: NEC 440.12(A)(1)

Question 40: Which of the following is the length of the 120 volt flexible cord that — supplies a room air-conditioner?

10 ft
6 ft
8 ft
9 ft

NEC Reference: NEC 440.64

Question 41: Which of the following is NOT a standard overcurrent device size listed in 240.6(A)?

45A
55A
110A
175A

NEC Reference: NEC 240.6(A)

Question 42: What is the minimum operating rating of short circuit ground fault protective device that can be used for individual motor-compressor?

10 A
15 A
20 A
25 A

NEC Reference: NEC 440.22(A)

Question 43: A 2/0 THWN conductor is placed in a dry location where the ambient temperature is 45⁰C. What is corrected ampacity of the conductor?

170 Amperes
160 Amperes
165 Amperes
175 Amperes

NEC Reference: NEC 310.15(B)(16)

Question 44: The grounded conductor terminal shall terminate with in the panel board in an individual terminal.

True
False

NEC Reference: NEC 408.41

Question 45: The recreational park is having fifteen 20 A supply facilities, ten 20A and 30 A supply facilities and twenty five 50A supply facilities is operated at 120/240 V single phase. What is the service demand load for the recreational park?

480 A
533 A
686 A
564 A

NEC Reference: NEC 551.73(A)

Question 46: What is the minimum load of household Electric cloth dryer in a dwelling unit?

5000 Volt-ampere
1500 Volt-ampere
3000 volt-ampere

NEC Reference: NEC 220.54

Question 47: The mobile home park which has 25 site facilities is fed from a 240 V service feeder. What is the demand load for mobile home park?

400 A
450 A
500 A
380 A

NEC Reference: NEC 550.31

Question 48: Which of the following is the minimum branch circuit size operated at 480 volts and with out any correction factors?

Continuous load plus non-continuous load
Continuous load plus 125 % of non-continuous load
125% of Continuous load plus non-continuous load
125% of Continuous load

NEC Reference: NEC 210.19(A)(1)

Question 49: What is the general lighting load (in volt-amperes per square foot) used for a single-family dwelling when doing a standard load calculation?

1.5 VA/sq ft
2 VA/sq ft
3 VA/sq ft
3.5 VA/sq ft

NEC Reference: NEC Table 220.12

Question 50: If a 20 ampere ac snap switch is used to disconnect a 1.5 Hp motor what must be the maximum full load current of a motor?

16 Amperes
20 Amperes
15 Amperes
17 Amperes

NEC Reference: NEC 430.109(c)(2)

Question 51: How many number of 500 kcmil THWN conductors that can be installed in a 4 in. * 4 in. wireway?

4 conductors
5 conductors
6 conductors
7 conductors

NEC Reference: NEC 376.22(A)

Question 52: The 30 amp branch circuit provided for laundry outlet shall not have any other outlet.

True
False

NEC Reference: NEC 210.11

Question 53: The Transformer secondary is protected with GFCI which is connected to impedance heating elements. What is the maximum secondary voltage?

30 volts
80 volts
50 volts
60 volts

NEC Reference: NEC 424.32

Question 54: Type UF cable is rated for underground and wet locations. Can it also be used for interior branch circuit wiring inside a building?

No — Type UF is only approved for underground use
Yes — it can be used for interior branch circuits where NM cable is allowed
Yes — but only in wet or damp interior locations
No — Type UF requires conduit protection when installed indoors

NEC Reference: NEC 340.10(B)(4)

Question 55: A breaker is used to switch fluorescent lighting on and off many times a day. What special rating must this breaker have?

The breaker must be rated GFCI
The breaker must be rated SWD (switching duty) or HID
Any standard breaker is acceptable for lighting
The breaker must be rated for continuous operation

NEC Reference: NEC 240.83(D)

Question 56: The total connected load of dwelling unit is 11000 VA , what is the calculated demand load?

3150 VA
11000 VA
9000 VA
6000 VA

NEC Reference: NEC 240.42

Question 57: What is the maximum overall length of the power supply cord for mobile homes?

36 1/2 feet
21 feet
28 1/2 feet
20 feet

NEC Reference: NEC 550.10(D)

Question 58: The secondary systems of lighting circuits shall not be grounded.

True
False

NEC Reference: NEC 411.5

Question 59: 210.20(A) requires branch-circuit OCPD at not less than 125% of continuous load + 100% of non-continuous, except where:

The breaker and enclosure are listed for 100% continuous operation
The load is below 16A
The branch circuit is GFCI protected
No exception applies

NEC Reference: NEC 210.20(A) Exception

Question 60: Field installed secondary circuit winding for electrical signs of 1000 volts or less shall have a conductor size not less than .....................

18 AWG
16 AWG
14 AWG
12 AWG

NEC Reference: NEC 600.3

Question 61: What is the minimum size copper EGC for a circuit protected by a 200A overcurrent device?

10 AWG copper
8 AWG copper
6 AWG copper
4 AWG copper

NEC Reference: NEC Table 250.122

Question 62: The FMC cable shall be supported and secured at intervals less than ......................

less than 3 1/2 inches
less than 4 1/2 inches
less than 5 1/2 inches
less than 6 1/2 inches

NEC Reference: NEC 348.30(A)

Question 63: To qualify as a concrete-encased grounding electrode, a rebar or conductor encased in concrete must be at least how long?

8 feet
10 feet
20 feet
30 feet

NEC Reference: NEC 250.52(A)(3)

Question 64: Which of the following is the smallest size grounded electric conductor for an electric service using 1200 kcmil copper conductor?

2/0 copper
3/0 copper
1/0 copper
4 AWG copper

NEC Reference: NEC 250.66

Question 65: The interior metal water piping system must be bonded to the electrical service. Where must this bond be made, and what size conductor is required?

At any accessible point, sized by Table 310.16
At or near the service, sized by Table 250.102(C)(1) based on service conductor size
At every metal fixture, using 14 AWG minimum
Only at the water heater, using 6 AWG minimum

NEC Reference: NEC 250.104(A)

Question 66: What is the smallest rating plug fuse that is used for residential 120 volts branch circuit?

15 amperes
20 amperes
12 amperes
18 amperes

NEC Reference: NEC 240.6(A)

Key NEC References for This Test

Article	What It Covers
Art. 100	Definitions — know: feeder, branch circuit, OCPD, dwelling unit
Art. 210	Branch Circuits — GFCI/AFCI locations, circuit ratings, outlet spacing (most tested)
Art. 220	Load Calculations — dwelling unit standard method
Art. 250	Grounding & Bonding — GEC sizing, electrode system, EGC
Art. 310	Conductors — ampacity (Table 310.12), insulation, derate rules
Art. 430	Motors — conductor 125% FLA, OCPD 250% FLA, overloads, disconnects

Study Tip: Tab Articles 210, 250, and 430 in your NEC before the exam. Know the Table 310.12 ampacity values for 14, 12, 10, 8, 6, and 4 AWG copper.

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Maryland Journeyman Electrician Practice Test - Full-Length Test 1

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Maryland Journeyman Electrician Practice Test - Full-Length Test 1 — Question List

Question 1: A nonautomatic arc welder has a 60% duty cycle and primary current of 50A. Table 630.11(A) gives a multiplier of 0.78 for 60% duty cycle. What is the minimum branch circuit conductor ampacity?

Question 2: An electrician installs a motor according to all NEC rules, but the motor manufacturer instructions say to use a specific wiring method and conductor size that is more restrictive than what the NEC requires. Which takes precedence?

Question 3: What shall be the maximum weight of the lightening fixture when it is supported only by the screw shell of the lamp holder?

Question 4: What is ampacity of 1/0 THWN conductor in a dry location at an ambient temperature of 1040 F if the raceway contains four 1/0 THWN conductors?

Question 5: A single family dwelling unit has a connected load of 4000 VA. which of the following is the calculated demand load?

Question 6: Which of the following is the ampacity of 4 AWG SE cable?

Question 7: What is the minimum feeder or service load for cloth dryers in a dwelling unit?

Question 8: How many types of 4 wire feeders shall be permitted to utilize a common neutral?

Question 9: How many maximum number of receptacles are permitted on — a 20 ampere breaker supplied by 120 volts power source in a shopping complex?

Question 10: The allowable ampacity of the branch circuit conductors shall be permitted to be not less than the sum of the continuous load plus ......................... load

Question 11: What are the maximum allowable service dis connectors consist for each service?

Question 12: Which of the following circuits shall not be connected to system containing trolley wires?

Question 13: Per 230.95, ground-fault protection of equipment is required on solidly grounded wye services of more than 150V to ground rated:

Question 14: Which of the following is the maximum rating of a branch circuit that supply the primary of low voltage lighting system power supply?

Question 15: A device box is mounted in a concrete block wall. How far can the front edge of the box be set back from the finished wall surface?

Question 16: Show window load per 220.43(A) is calculated at not less than:

Question 17: A motor is in the basement and its disconnect is on the first floor where you cannot see the motor. What does the NEC allow in this situation?

Question 18: For a 300 ampere electrical circuit, what is the minimum size copper equipment grounding conductor as per NEC?

Question 19: What is the minimum feeder/service conductor calculated load for an electrical sign?

Question 20: How many number of entrances should be provided to give access from working space about electrical equipment?

Question 21: A metal underground water pipe is used as a grounding electrode. What additional requirement must be met?

Question 22: Per 220.61(C)(2), the feeder neutral load for non-linear (electric-discharge or harmonic-producing) loads is calculated at:

Question 23: The minimum headroom of the working space in front of a panelboard, switchboard, or motor control center must be at least:

Question 24: 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 25: Which of the following is the minimum size of fixture size that can use for wiring control circuits?

Question 26: Without applying any de-rating factor for conductor current carrying capacity, how many conductors can run parallel in raceway or cable?

Question 27: In which of the following the panel boards must be enclosed?

Question 28: A cable clamp inside a device box counts for how many conductor volumes in the box fill calculation?

Question 29: A 4800 watts electric motor is connected to 240 volts single phase supply, 2 wire circuit. what is the minimum size THW conductor that is required to supply the load?

Question 30: A 277/480V, 3-phase, 4-wire wye service in a commercial building is rated at 2000A. Per 230.95, does this service require ground-fault protection of equipment (GFP)?

Question 31: What is the corrected ampacity of a 2/0 THWN conductor in a dry location, If the ambient temperature of the location is 450 C?

Question 32: Mutli-wire branch circuits shall not be permitted in class I division I locations.

Question 33: A motor nameplate shows FLA = 40A and service factor = 1.15. What is the highest trip setting allowed on the overload relay?

Question 34: For a 400A service with 600 kcmil copper conductors, what is the minimum GEC size per Table 250.66?

Question 35: When one or more equipment grounding conductors or equipment bonding jumpers enters in a metal box can be considered as how many number of total conductors in a metal box?

Question 36: What is the minimum size of THWN conductors required for single phase 10 HP motor — connected to 240 volts supply?

Question 37: If the conduit is placed in hazardous locations, it must be made ...................... to prevent sparking when a fault current flows through it.

Question 38: A mechanical contractor wants to run a water supply pipe through the dedicated electrical space directly above a 200A panelboard. Is this permitted?

Question 39: If the replacement compressor motor draws 35 amperes current, what is the minimum rating for disconnecting means used to protect the motor?

Question 40: Which of the following is the length of the 120 volt flexible cord that — supplies a room air-conditioner?

Question 41: Which of the following is NOT a standard overcurrent device size listed in 240.6(A)?

Question 42: What is the minimum operating rating of short circuit ground fault protective device that can be used for individual motor-compressor?

Question 43: A 2/0 THWN conductor is placed in a dry location where the ambient temperature is 450C. What is corrected ampacity of the conductor?

Question 44: The grounded conductor terminal shall terminate with in the panel board in an individual terminal.

Question 45: The recreational park is having fifteen 20 A supply facilities, ten 20A and 30 A supply facilities and twenty five 50A supply facilities is operated at 120/240 V single phase. What is the service demand load for the recreational park?

Question 46: What is the minimum load of household Electric cloth dryer in a dwelling unit?

Question 47: The mobile home park which has 25 site facilities is fed from a 240 V service feeder. What is the demand load for mobile home park?

Question 48: Which of the following is the minimum branch circuit size operated at 480 volts and with out any correction factors?

Question 49: What is the general lighting load (in volt-amperes per square foot) used for a single-family dwelling when doing a standard load calculation?

Question 50: If a 20 ampere ac snap switch is used to disconnect a 1.5 Hp motor what must be the maximum full load current of a motor?

Question 51: How many number of 500 kcmil THWN conductors that can be installed in a 4 in. * 4 in. wireway?

Question 52: The 30 amp branch circuit provided for laundry outlet shall not have any other outlet.

Question 53: The Transformer secondary is protected with GFCI which is connected to impedance heating elements. What is the maximum secondary voltage?

Question 54: Type UF cable is rated for underground and wet locations. Can it also be used for interior branch circuit wiring inside a building?

Question 55: A breaker is used to switch fluorescent lighting on and off many times a day. What special rating must this breaker have?

Question 56: The total connected load of dwelling unit is 11000 VA , what is the calculated demand load?

Question 57: What is the maximum overall length of the power supply cord for mobile homes?

Question 58: The secondary systems of lighting circuits shall not be grounded.

Question 59: 210.20(A) requires branch-circuit OCPD at not less than 125% of continuous load + 100% of non-continuous, except where:

Question 60: Field installed secondary circuit winding for electrical signs of 1000 volts or less shall have a conductor size not less than .....................

Question 61: What is the minimum size copper EGC for a circuit protected by a 200A overcurrent device?

Question 62: The FMC cable shall be supported and secured at intervals less than ......................

Question 63: To qualify as a concrete-encased grounding electrode, a rebar or conductor encased in concrete must be at least how long?

Question 64: Which of the following is the smallest size grounded electric conductor for an electric service using 1200 kcmil copper conductor?

Question 65: The interior metal water piping system must be bonded to the electrical service. Where must this bond be made, and what size conductor is required?

Question 66: What is the smallest rating plug fuse that is used for residential 120 volts branch circuit?

Key NEC References for This Test

Every Maryland Variant. One Real Result.

Question 4: What is ampacity of 1/0 THWN conductor in a dry location at an ambient temperature of 104⁰ F if the raceway contains four 1/0 THWN conductors?

Question 31: What is the corrected ampacity of a 2/0 THWN conductor in a dry location, If the ambient temperature of the location is 45⁰ C?

Question 43: A 2/0 THWN conductor is placed in a dry location where the ambient temperature is 45⁰C. What is corrected ampacity of the conductor?