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JOURNEYMAN NEC 2023

Journeyman Electrician Practice Test 9

This is Journeyman Electrician Practice Test 9. It is a free practice test with 30 questions to help you get ready for your journeyman electrician licensing exam. The questions cover motor disconnects, power calculations, feeder taps, voltage drop, service sizing, conductor fill, and basic circuit theory. You need 70% or higher to pass. Every question shows a full explanation with NEC reference after you submit.

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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You have 45 min for 30 questions. Skip tough ones and come back.

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After submitting you'll see every explanation and your NEC references.

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.

Before You Start

30 questions — multiple choice
45 minutes to finish
Pass score is 70% — you need 21 or more correct
Full explanation with NEC reference shown after you submit

What This Test Covers

Motor disconnect switch rating
Power loss calculation P = I²R with milliamps
Feeder tap conductor ampacity (NEC 240.21)
Branch circuit maximum voltage drop = 3% (NEC 210.19)
Single dwelling 3-wire service size (NEC 230.79)
Equipment grounding conductor color (NEC 310.12)
Quick recovery heater circuit breaker sizing
3-phase 4-wire voltage: line vs neutral (480V/1.73 = 277V)
Single phase motor: one overcurrent device for all protection
Fault current returns to source
Conductor fill in 3/4 inch EMT (NEC Annex C)
Motor overload protection with service factor (NEC 430.32)
4-wire feeder common neutral (NEC 215.4)
Auxiliary gutter fill limit (NEC 366.22)
Fuses connected in series (NEC 240.15)
Metal underground water pipe grounding electrode (NEC 250.52)
Ambient temperature conductor derating
Class I Division 1 wiring methods (NEC 501.10)
Emergency system testing (NEC 700.3)
Neat and workmanlike installation (NEC 110.12)

Tip: Keep a calculator handy — several questions use P = I²R and voltage drop calculations.

Questions

45 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

Journeyman Electrician Practice Test 9 — Question List

Question 1: The disconnect switch Rating for motor loads is kept higher than motor conductor to permit the motor to start.

True
False

Question 2: In an electrical circuit the fault current returns to the source power supply.

False
True

Question 3: A single phase motor can be protected against overload short circuit and ground fault by a single over current device.

True
False

NEC Reference: NEC 430.32

Question 4: The maximum recommended voltage drop in a branch circuit is ........................ percentage

NEC Reference: NEC 210.19

Question 5: Equipment grounding conductors are identified by .............. color.

Red
Green
Grey

NEC Reference: NEC 310.12(B)

Question 6: The fuses used for circuit protection shall be connected in ……………….

Series
Parallel
Both series and parallel
All the options are correct

NEC Reference: NEC 240.15(A)

Question 7: How much maximum percentage of auxiliary gutters interior cross sectional area can be filled with conductors?

30 %
20 %
60 %
50 %

NEC Reference: NEC 366.22

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

NEC Reference: NEC 215.4

Question 9: In a trade size of ¾ EMT, How many 14 AWG RHH conductors can be pulled in the raceway. The RHH conductors are coverless.

6 conductors
10 conductors
16 conductors
24 conductors

Question 10: What is the minimum size of 3 wire service for single dwelling with an initial load of 20 kVA or more.

100 Amperes
150 Amperes
50 Amperes
90 Amperes

NEC Reference: NEC 230.79(C)

Question 11: A three phase 4 wire electrical system phase-phase voltage is 480 Volts. What is its phase to neutral voltage.

480 volts
240 Volts
277 Volts
377 Volts

Question 12: The rating of feeder tap over current terminating device is 40 Amperes. Which of the following ampacity feeder tap can be used if the conductor length is less than 10 feet.?

38 Amperes
39 Amperes
41 Amperes
35 Amperes

NEC Reference: NEC 240.21

Question 13: A Quick Recovery electric heater is rated at 4500 watts 240 volts. What rating of circuit breaker is required for protecting it?

30 Amperes
25 Amperes
20 Amperes
15 Amperes

NEC Reference: NEC 422.13

Question 14: A 4 hp 230 V single phase motor has a service factor of 1.15 and name plate current rating of 25 A. What size dual element fuse can be used to protect the motor from overloads, short circuit and ground faults?

25 A
30 A
28 A
35 A

NEC Reference: NEC 430.32(A)(1)

Question 15: If a lamp resistance is 500 ohms and the ammeter near to the lamp indicates 5 mA. What is the power dissipated in the lamp?

2.5 w
12.5 mw
125 mw
25 mw

Question 16: A metal underground water supply pipe may be used as a grounding electrode if it is in contact with the earth for at least how many feet?

5 feet
10 feet
20 feet
3 feet

NEC Reference: NEC 250.52(A)(1)

Question 17: When ambient temperature is higher than 30°C, conductor ampacity from the NEC table must be .............

Increased
Derated using correction factors
Kept the same
Doubled

NEC Reference: NEC 310.15(B)(2)

Question 18: What is the required wiring method for Class I Division 1 hazardous locations?

PVC conduit
NM cable
Threaded RMC or threaded IMC
EMT

NEC Reference: NEC 501.10(A)(1)

Question 19: How often must an emergency system be tested to verify proper operation under load?

Every 3 months
Every 6 months
Every 12 months
Every 24 months

NEC Reference: NEC 700.3(C)

Question 20: A 3-phase delta-connected system does not have a neutral conductor. True or False?

True
False

Question 21: A recessed luminaire installed in a ceiling where insulation is present must be what type?

Standard open type
Listed for contact with insulation (Type IC)
Sealed airtight type
Any listed recessed type

NEC Reference: NEC 410.116(A)(1)

Question 22: NEC 210.63 requires a 125-volt receptacle within how many feet of HVAC equipment in attics and on rooftops?

10 feet
15 feet
25 feet
50 feet

NEC Reference: NEC 210.63

Question 23: A transformer has an output power of 2 kVA and an input power of 2.5 kVA. What is its efficiency?

125%
90%
80%
75%

Question 24: According to the NEC, electrical equipment must be installed in a neat and workmanlike manner. True or False?

True
False

NEC Reference: NEC 110.12

Question 25: A feeder supplies two motors: 40A FLC and 25A FLC. What is the minimum required feeder ampacity?

65 amperes
75 amperes
80 amperes
90 amperes

NEC Reference: NEC 430.17

Question 26: For a straight pull, what is the minimum length of a pull box that has a 2-inch conduit entering it?

8 inches
12 inches
16 inches
24 inches

NEC Reference: NEC 314.28(A)(1)

Question 27: GFCI protection is required for 15 and 20 ampere receptacles in bathrooms of commercial buildings. True or False?

True
False

NEC Reference: NEC 210.8(B)(1)

Question 28: A 240-volt heater element has a resistance of 24 ohms. What is the power it consumes?

1,200 watts
2,400 watts
4,800 watts
960 watts

Question 29: Conductance is the ability of a circuit to allow current flow. It is equal to .............

Resistance × current
1 ÷ resistance
Voltage × current
Current ÷ voltage

Question 30: Service entrance cable (SE cable) can be used as interior branch circuit wiring in dwellings. True or False?

True
False

NEC Reference: NEC 338.10(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.

Journeyman Electrician Practice Test 9

How this test works

Frequently Asked Questions

Before You Start

What This Test Covers

Student Reviews

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Key NEC References for This Test

Journeyman Electrician Practice Test 9

How this test works

Frequently Asked Questions

Is this Journeyman Electrician Practice Test 9 free?

How many questions are on the Journeyman Electrician exam?

What score do you need to pass the Journeyman exam?

What NEC edition is this test based on?

Before You Start

What This Test Covers

Student Reviews

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Journeyman Electrician Practice Test 9 — Question List

Question 1: The disconnect switch Rating for motor loads is kept higher than motor conductor to permit the motor to start.

Question 2: In an electrical circuit the fault current returns to the source power supply.

Question 3: A single phase motor can be protected against overload short circuit and ground fault by a single over current device.

Question 4: The maximum recommended voltage drop in a branch circuit is ........................ percentage

Question 5: Equipment grounding conductors are identified by .............. color.

Question 6: The fuses used for circuit protection shall be connected in ……………….

Question 7: How much maximum percentage of auxiliary gutters interior cross sectional area can be filled with conductors?

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

Question 9: In a trade size of ¾ EMT, How many 14 AWG RHH conductors can be pulled in the raceway. The RHH conductors are coverless.

Question 10: What is the minimum size of 3 wire service for single dwelling with an initial load of 20 kVA or more.

Question 11: A three phase 4 wire electrical system phase-phase voltage is 480 Volts. What is its phase to neutral voltage.

Question 12: The rating of feeder tap over current terminating device is 40 Amperes. Which of the following ampacity feeder tap can be used if the conductor length is less than 10 feet.?

Question 13: A Quick Recovery electric heater is rated at 4500 watts 240 volts. What rating of circuit breaker is required for protecting it?

Question 14: A 4 hp 230 V single phase motor has a service factor of 1.15 and name plate current rating of 25 A. What size dual element fuse can be used to protect the motor from overloads, short circuit and ground faults?

Question 15: If a lamp resistance is 500 ohms and the ammeter near to the lamp indicates 5 mA. What is the power dissipated in the lamp?

Question 16: A metal underground water supply pipe may be used as a grounding electrode if it is in contact with the earth for at least how many feet?

Question 17: When ambient temperature is higher than 30°C, conductor ampacity from the NEC table must be .............

Question 18: What is the required wiring method for Class I Division 1 hazardous locations?

Question 19: How often must an emergency system be tested to verify proper operation under load?

Question 20: A 3-phase delta-connected system does not have a neutral conductor. True or False?

Question 21: A recessed luminaire installed in a ceiling where insulation is present must be what type?

Question 22: NEC 210.63 requires a 125-volt receptacle within how many feet of HVAC equipment in attics and on rooftops?

Question 23: A transformer has an output power of 2 kVA and an input power of 2.5 kVA. What is its efficiency?

Question 24: According to the NEC, electrical equipment must be installed in a neat and workmanlike manner. True or False?

Question 25: A feeder supplies two motors: 40A FLC and 25A FLC. What is the minimum required feeder ampacity?

Question 26: For a straight pull, what is the minimum length of a pull box that has a 2-inch conduit entering it?

Question 27: GFCI protection is required for 15 and 20 ampere receptacles in bathrooms of commercial buildings. True or False?

Question 28: A 240-volt heater element has a resistance of 24 ohms. What is the power it consumes?

Question 29: Conductance is the ability of a circuit to allow current flow. It is equal to .............

Question 30: Service entrance cable (SE cable) can be used as interior branch circuit wiring in dwellings. True or False?

Key NEC References for This Test

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