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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 26

Free practice test 26 for the journeyman electrician exam. Covers flexible metal conduit maximum size, impedance heating transformer limits, motor conductor sizing, delta breakers in panelboards, air conditioner load limits, induction motor theory, mobile home wiring, motor slip, demand factors, and energy cost calculation.

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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.

This test covers flexible conduit rules, motor theory, and mobile home wiring. FMC maximum trade size is 4 inches (NEC 348.20(B)). A motor conductor must be at least 125% of the motor FLC (NEC 430.22). For cord-and-plug 30A AC circuits, the air conditioner may not draw more than 50% of the circuit rating = 15A (NEC 440.52(C)). When voltage decreases in an induction motor, speed decreases and slip INCREASES. For 6 mobile homes on one feeder, NEC Table 550.31 gives a demand factor of 29%.

30

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45 min

Time

70%

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Journeyman Electrician Practice Test 26 — Question List

Question 1: <span style="font-size: 14pt;">The maximum size of FMC that can be used is which of the following?</span>

2 inches
4 inches
6 inches
1/2 inch

NEC Reference: NEC 348.20(B)

Question 2: <span style="font-size: 14pt;">The Transformer secondary is protected with GFCI which is connected to impedance heating elements. What is the maximum secondary voltage?</span>

30 volts
80 volts
50 volts
60 volts

NEC Reference: NEC 424.32

Question 3: <span style="font-size: 14pt;">A single phase motor 5 HP, 230 volts motor has a full load current of 50 amperes, What is its full load conductor ampacity in amperes?</span>

62.5 amperes
75 amperes
57.5 amperes
50 amperes

NEC Reference: NEC 430.22

Question 4: In which of the following devices the delta breakers cannot be installed?

Panel boards
Conduit boxes
metal boxes
Enclosures

NEC Reference: NEC 408.36

Question 5: <span style="font-size: 14pt;">A 120 volt 30 amp branch circuit supplies cord and attachment type air-conditioner, which of the following is the maximum full load current of an air-conditioner?</span>

15 amperes
24 amperes
30 amperes
20 amperes

NEC Reference: NEC 440.52

Question 6: When a supply voltage to the induction motor decreases the slip of the motor decreases.

True
False

Question 7: A feeder assembly shall not be required for manufactured homes constructed with power supply cord attached with the distribution panel board.

True
False

NEC Reference: NEC 550.10

Question 8: Synchronous motors are widely used in industries compared to induction motors.

True
False

Question 9: If 6 mobile homes are connected to a single feeder what is the demand factor that shall be used in calculating the load?

29 %
33 %
28%
35%

NEC Reference: NEC 550.31

Question 10: A 100 watt light in dwelling unit is on for 4 hours, if the cost of electricity is $1 per 1kwh then which of the following is the total cost of electricity that the light consumed?

$ 4
$ 0.4
$ 0.1
$ 0.5

Question 11: What is the minimum trade size of Flexible Metal Conduit (FMC) permitted for general wiring?

3/8 inch
1/2 inch
3/4 inch
1 inch

NEC Reference: NEC 348.20(A)

Question 12: What is the synchronous speed of a 4-pole induction motor operating on 60 Hz power?

3600 RPM
1800 RPM
900 RPM
1200 RPM

Question 13: Slip in an induction motor is the difference between .............

The supply voltage and the back-EMF
The synchronous speed and the actual rotor speed
The starting torque and the running torque
The input power and the output power

Question 14: When calculating feeder and service capacity for a mobile home park, what demand factor applies to a single mobile home lot?

29%
100%
50%
75%

NEC Reference: NEC Table 550.31

Question 15: Per NEC 408.36(C), delta breakers shall not be installed in panelboards because .............

They are too expensive
They create unbalanced currents and are not listed for panelboard use
They only work in residential panels
They require a special tool to install

NEC Reference: NEC 408.36(C)

Question 16: A 2000-watt electric heater runs for 5 hours per day for 30 days. At $0.12 per kWh, what is the total electricity cost?

$3.60
$36.00
$0.36
$360.00

Question 17: For a manufactured home installed in a mobile home park, the supply cord or feeder assembly connects from the park pedestal to .............

The utility transformer
The manufactured home distribution panel or cord inlet
Any outdoor receptacle on the home
The home's water heater disconnect

NEC Reference: NEC 550.10

Question 18: A 30-ampere, 120-volt branch circuit supplies only one cord-and-plug connected room air conditioner. What is the maximum current the air conditioner may draw?

30 amperes
15 amperes
24 amperes
20 amperes

NEC Reference: NEC 440.52(C)

Question 19: Why is a 3-phase induction motor considered "self-starting" while a single-phase induction motor is not?

3-phase motors have larger windings
3-phase supply creates a rotating magnetic field that provides starting torque automatically
3-phase motors run at higher speed
Single-phase motors use more current

Question 20: When sizing motor branch circuit conductors and overcurrent protection, the full load current (FLC) used for calculations must come from .............

The motor nameplate
NEC Tables 430.247 through 430.250
The motor manufacturer's specification sheet
The calculated demand load

NEC Reference: NEC 430.6(A)(1)

Question 21: What is the minimum working clearance depth for 120/240V equipment where live parts are on BOTH sides of the working space?

2 feet
4 feet
3 feet
6 feet

NEC Reference: NEC 110.26(A)(1)

Question 22: Electric space heating equipment is considered a continuous load. What percentage of the total heating load is used for branch circuit and feeder conductor sizing?

100%
125%
80%
115%

NEC Reference: NEC 424.3(B)

Question 23: In an AC circuit supplying inductive loads (motors, transformers), the current waveform .............

Leads the voltage
Lags behind the voltage
Is always in phase with the voltage
Has a higher frequency than the voltage

Question 24: The service entrance cable or individual conductors at the service head (weatherhead) must be formed into a ............. to prevent water entry into the service.

Straight splice covered with tape
Drip loop to prevent water entry
Tight upward bend
Weatherproof junction box connection

NEC Reference: NEC 230.54(F)

Question 25: Service-entrance cables exposed to physical damage must be protected by .............

Tape wrapping
Rigid metal conduit, IMC, EMT, or Schedule 80 PVC
Schedule 40 PVC only
No protection is required if over 6 feet high

NEC Reference: NEC 230.50(A)

Question 26: Joule's Law states that the heat energy produced in a conductor is proportional to .............

Current only (I)
Current squared times resistance times time (I²Rt)
Voltage squared (V²)
Resistance only (R)

Question 27: The overcurrent device protecting feeders to a marina must have ground fault protection set at not more than .............

30 mA
100 mA
500 mA
150 mA

NEC Reference: NEC 555.3

Question 28: The maximum voltage for yard and pier distribution systems at a marina is .............

120 volts
600 volts
480 volts
240 volts

NEC Reference: NEC 555.4

Question 29: A disconnecting means is required for fixed electric space heating equipment rated at .............

Over 1000 watts only
All fixed electric heating equipment
Only 3-phase heating equipment
Heating equipment over 240 volts

NEC Reference: NEC 424.19

Question 30: To improve (raise) the power factor of a system with many inductive loads (motors), which of the following is connected to the system?

Additional inductors (reactors)
Capacitors connected in parallel with the load
Resistors in series with the load
A higher voltage transformer

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)