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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 15

Free practice test 15 for the journeyman electrician exam. Covers motor overload devices, service drop clearances, grounding electrode sizing, appliance overload protection, transformer theory, and LFMC conduit.

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Frequently Asked Questions

Yes — completely free with no account required. All questions include detailed explanations and NEC references.

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.

This test covers grounding, motor protection, and basic electrical theory. Remember the wire color rule: GREEN or bare = equipment grounding conductor. WHITE or gray = neutral. Review NEC 250.66 (GEC sizing for ground rods), NEC 350.20 (LFMC), and NEC 240.51 (plug fuses) before you start.

30

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45 min

Time

70%

Pass

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Journeyman Electrician Practice Test 15 — Question List

Question 1: A split phase motor should not be used to start heavy loads.

True
False

Question 2: The direction of rotation of a RI motor can be changed ..............................

by changing the position of the brushes
by reversing the two leads of starting and running windings

Question 3: The motor overload device ampere rating should not be less than ............. percentage of the motor full load ampere rating, if the motor is used in homes and on farms.

20
25
30
40

Question 4: The service drop wire should maintain clearance of at least ........... from windows.

3 ft
10 ft
2 ft
5 ft

Question 5: When a ground rod is used, the ground wire size not be larger than .......................

No 6
No 8
No 10

Question 6: If a 20 amp non motor operated appliance is supplied by a branch circuit what is the maximum ampere rating of a overload device in the circuit?

20 amp
30 amp
25 amp
35 amp

Question 7: Which color wire is the mostly used as ground wire?

red
black
green
white

Question 8: If the current in two current carrying conductors is in opposite direction, which force will exerts in between conductors?

attractive force
repulsive force

Question 9: In a D.C Generator, the sparking at brushes occurs due to .....................................

armature reaction
reactance voltage in coil
current reversal in the coil

Question 10: Which of the following is suitable statement to indicate that an electrical transformer cannot be used for DC Power System

D.C Transformer has high losses compared to A.C Transformer
DC Voltage Step Up / Step Down is not needed
Faraday's law of induction is not valid as the rate of change of flux is zero

Question 11: Which of the following is equal to the power factor of an electrical circuit?

The ratio of true power to apparent power
The ratio of resistance to impedance
The ration of voltage to current
All options are correct

Question 12: What is the minimum size liquid tight flexible metal conduit ( LFMC) that can be used for general purpose?

½ inch
¼ inch
¾ inch
1 inch

NEC Reference: NEC 350.20(A)

Question 13: 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 14: 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 15: What is the highest current rating of plug fuses of Edison base type?

30 amperes
120 amperes
80 amperes
50 amperes

NEC Reference: NEC 240.51

Question 16: Faraday's Law states that a voltage is induced in a conductor when .............

Current flows through the conductor
The conductor experiences a changing magnetic flux
The conductor is heated above 60°C
The conductor carries DC current only

Question 17: Lenz's Law states that the direction of an induced current is always .............

In the same direction as the applied voltage
In a direction that opposes the change that caused it
Always clockwise when viewed from above
Determined only by conductor material

Question 18: In a DC circuit under steady-state conditions, how does an inductor (coil) behave?

It blocks all current from flowing
It behaves like a plain resistor (only wire resistance)
It creates a very high impedance
It becomes a short circuit

Question 19: A capacitor in an electrical circuit will .............

Block both AC and DC current equally
Allow both AC and DC to pass without any difference
Block DC current but allow AC current to pass
Block AC current but allow DC to pass

Question 20: Type NM (Romex) cable is NOT permitted in which locations?

Inside interior walls of a home
Wet or damp locations and locations with physical damage risk
Attics with adequate lighting and walking boards
Crawl spaces accessible for inspection

NEC Reference: NEC 334.12(B)

Question 21: How many small appliance branch circuits are required for the kitchen and dining areas in a dwelling unit?

One 15-ampere circuit
One 20-ampere circuit
Two 20-ampere circuits
Three 20-ampere circuits

NEC Reference: NEC 210.11(C)(1)

Question 22: What is the function of a lightning (surge) arrester in an electrical system?

To increase the supply voltage during storms
To protect equipment from high-voltage spikes by diverting them to ground
To measure lightning current
To prevent lightning from striking the building

Question 23: To measure the current in a circuit, an ammeter must be connected .............

In parallel with the load
In series with the load
Across the power source
Between neutral and ground

Question 24: To measure the voltage across a load, a voltmeter must be connected .............

In series with the load
In parallel (across) the load
Between hot and ground only
At the main panel terminals

Question 25: What is the maximum continuous load allowed on a 15-ampere, 120-volt branch circuit?

15 amperes (1800 watts)
12 amperes (1440 watts)
10 amperes (1200 watts)
7.5 amperes (900 watts)

NEC Reference: NEC 210.19(A)(1)

Question 26: What is the minimum depth of working space required in front of a 120/240V residential panel?

1 foot
2 feet
3 feet
4 feet

NEC Reference: NEC 110.26(A)(1)

Question 27: When calculating box fill per NEC 314.16, how are conductors that pass through a box without a splice counted?

They are not counted at all
They count as one conductor each
They count as two conductors each
They count as half a conductor each

NEC Reference: NEC 314.16(B)(1)

Question 28: At what current imbalance does a GFCI device trip to protect against electric shock?

50 milliamperes
20 milliamperes
5 milliamperes
100 milliamperes

Question 29: Which instrument measures the TRUE (real) power in an AC circuit in watts?

Voltmeter
Ammeter
Wattmeter
Power factor meter

Question 30: According to NEC 240.51(B), when can Edison-base plug fuses be used in new installations?

In any new residential installation
Only as replacements in existing fuse panel installations
Whenever the panel is rated 200 amperes or less
In all outdoor locations

NEC Reference: NEC 240.51(B)

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.

EXAM CARD JOURNEYMAN

Questions30

Time limit45 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: NEC 2026 (NFPA 70)