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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 29

Free practice test 29 for the journeyman electrician exam. Covers high-voltage working clearances, ground ring depth, Type AC cable prohibited locations, marina distribution voltage, power factor units, transformer turns ratio, capacitive reactance, resistor power rating, motor overload rules, and feeder tap conductor sizing.

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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 high-voltage clearances, AC circuit theory, and NEC calculations. Key facts: For equipment rated above 600V with live parts on both sides of the work space, the minimum clearance is 5 feet (NEC Table 110.34, Condition 3). Type AC cable is NOT allowed in damp or wet locations (NEC 320.12). Capacitive reactance XC = 1/(2πfC) — when frequency doubles, XC is HALVED (not doubled). Power factor is a dimensionless ratio (no unit) equal to cos θ. For transformer turns ratio 10:4 with 120V secondary: primary = 120 × 10/4 = 300V.

30

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45 min

Time

70%

Pass

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Journeyman Electrician Practice Test 29 — Question List

Question 1: The minimum working depth ................. shall be required at electrical equipment rated at 601 volts where it has one side exposed live part and grounded parts at anther side of working space

3 ft
4 ft
5 ft
6 ft

NEC Reference: NEC 110.34(1)

Question 2: The guard ring must be in contact to the earth and shall be buried at a depth from the earth's surface not less than ......................

3 feet
2 feet
1 1/2 feet
2 1/2 feet

NEC Reference: NEC 250.53(F)

Question 3: Type AC Cables shall not be permitted to use in the following locations?

damp and wet locations
concealed locations
exposed locations
dry locations

NEC Reference: NEC 320.12

Question 4: Which of the following is the maximum phase to phase voltage of yard and pier distribution system?

120 volts
240 volts
600 volts
480 volts

NEC Reference: NEC 555.4

Question 5: The unit of power factor is:

VA
Watts
no unit
ampere

Question 6: The turns ratio of the transformer is 10:4 which of the following is the primary voltage of the transformer if the rated secondary is 120 volts.

300 volts
48 volts
1200 volts
480 volts

Question 7: If the supply frequency is doubled, the capacitive reactance of the circuit ..............

Will be reduced to half
will be doubled
remains same

Question 8: Which of the following is the maximum permissible current in 400 watts , 1 ohm resistor?

20 amperes
40 amperes
2 amperes
4 amperes

Question 9: The three phase motor should have overload protection device in each phase.

True
False

NEC Reference: NEC 430.37

Question 10: The ampacity of the tap conductors who's length is 25 ft long shall be less than .................... of the over current device protecting feeder conductors.

1/3
1/2
1/4
3/4

NEC Reference: NEC 240.21

Question 11: When a second ground rod must be installed (because the first rod exceeds 25 ohms), the two rods must be at least ............. apart.

3 feet
6 feet
8 feet
10 feet

NEC Reference: NEC 250.53(A)(2)

Question 12: What is the capacitive reactance (XC) of a capacitor in a direct current (DC) circuit?

Zero ohms — capacitors pass DC freely
Infinite ohms — capacitors block DC completely
Equal to the resistance in the circuit
Equal to the supply voltage divided by DC current

Question 13: A transformer with a turns ratio of 1:4 (step-up) has a primary current of 20 amperes. What is the secondary current?

80 amperes
5 amperes
20 amperes
4 amperes

Question 14: At resonance in a series RLC circuit, which of the following is true?

XL is greater than XC
XL equals XC and circuit impedance equals resistance only
XC is greater than XL
Current is at minimum

Question 15: Shore power receptacles at a marina for recreational vessels typically operate at which voltages?

Only 12V DC systems
30A/125V or 50A/125-250V for most recreational boats
Only 240V, 3-phase
Only 480V systems

NEC Reference: NEC 555.13

Question 16: A 3-phase motor has overload protection provided by thermal protectors built into the motor windings. Is a separate overload relay in each phase still required?

Yes — always required regardless of other protection
No — thermal protectors in the motor may substitute for separate overload devices
Yes — thermal protectors are not recognized by the NEC
No — three-phase motors never need overload protection

NEC Reference: NEC 430.37

Question 17: When a ground rod cannot be driven vertically due to rock, it may be installed at an angle not to exceed .............

30 degrees from vertical
45 degrees from vertical
60 degrees from vertical
90 degrees (horizontal only)

NEC Reference: NEC 250.53(B)

Question 18: Type AC cable is permitted to be used in which of the following conditions?

In wet or damp locations
In concealed and exposed dry locations
Directly buried in soil
In concrete-encased installations

NEC Reference: NEC 320.10

Question 19: In a purely resistive AC circuit, what is the phase angle between voltage and current?

90 degrees
0 degrees — current and voltage are in phase
45 degrees
30 degrees

Question 20: Unguarded live parts above 600V must be elevated to what minimum height above the floor if not otherwise protected?

6 feet 6 inches
8 feet 6 inches
10 feet
6 feet

NEC Reference: NEC 110.34(E)

Question 21: Power factor is expressed as a .............

Watts
Dimensionless ratio (no unit), sometimes expressed as a percentage
Volt-amperes
Amperes

Question 22: A ring electrode (ground ring) buried for use as a grounding electrode must be buried at a depth of at least .............

12 inches
2.5 feet (30 inches)
4 feet
18 inches

NEC Reference: NEC 250.53(F)

Question 23: A 5 kW electric motor runs for 8 hours. How much electrical energy does it consume?

5 kWh
40 kWh
8 kWh
400 kWh

Question 24: Transformer secondary conductors are not required to have overcurrent protection at the point of connection to the transformer secondary if the conductors .............

Are rated at 600V or less
Comply with the transformer secondary conductor protection rules (NEC 240.21(C))
Are installed in metallic conduit
Are rated at 90°C

NEC Reference: NEC 240.21(C)

Question 25: A motor disconnecting means is not required to be in sight from the motor if the controller disconnect .............

Is within 100 feet of the motor
Can be individually locked in the open position
Is rated for at least 200A
Has a red handle

NEC Reference: NEC 430.102(B)

Question 26: A motor with an integral thermal protector (listed for that motor) that protects the motor during continuous overloads may serve as the overload device required by NEC 430.32.

True
False

NEC Reference: NEC 430.32(A)(2)

Question 27: The metal frame of a building can be used as a grounding electrode if it is connected to .............

Nothing — building steel is always a grounding electrode by itself
A concrete-encased electrode, water pipe, ground ring, or rod per NEC 250.52
Only the utility neutral conductor
Only a ground rod of No. 2 AWG or larger

NEC Reference: NEC 250.52(A)(2)

Question 28: At a 480V panelboard, what is the minimum working clearance depth if both sides of the work space have live uninsulated parts?

3 feet
4 feet
5 feet
6 feet

NEC Reference: NEC 110.26(A)(1)

Question 29: A voltmeter used to measure voltage across a load must be connected .............

In series with the load
In parallel across the load
At the power source terminal only
In series with the ammeter

Question 30: In a delta (Δ) connected 3-phase system, what is the relationship between line voltage and phase voltage?

Line voltage equals √3 times phase voltage
Line voltage equals phase voltage
Line voltage is always less than phase voltage
Line voltage equals 2 times phase voltage

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)