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JOURNEYMAN NEC 2020

NEC 2020 Journeyman Practice Test 8

Free Online Journeyman Electrician Practice Test — NEC 2020 Edition 8This free 30-question practice test covers service entrance and disconnect rules, transformer overcurrent protection and installation, and GFCI/AFCI protection requirements, including the dishwasher and laundry area GFCI rules newly added in the 2020 NEC. All questions are based on the 2020 NEC.

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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 2020 NEC. Check your state licensing board to confirm which edition your state has adopted.

How to Use This Practice Test

This NEC 2020 Journeyman Practice Test 8 has 30 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: 30 multiple-choice, one correct answer each

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NEC 2020 Journeyman Practice Test 8 — Question List

Question 1: Per NEC 230.70(A)(1), the service disconnecting means must be installed at a location that is:

Readily accessible, nearest the point of entrance of the service conductors
In the attic, regardless of accessibility
In a locked closet requiring a special key
At least 100 feet from the point of service entrance

NEC Reference: NEC 230.70(A)(1)

Question 2: Per NEC 230.24(B), what is the minimum vertical clearance required for service-drop conductors over residential property and driveways, where the voltage does not exceed 300 volts to ground?

8 feet
10 feet
12 feet
18 feet

NEC Reference: NEC 230.24(B)(1)

Question 3: Per NEC 230.71(B), the service disconnecting means for each service permitted by 230.2 may consist of not more than how many switches or circuit breakers grouped at one location?

Two
Four
Six
Eight

NEC Reference: NEC 230.71(B)

Question 4: Per NEC 230.79(C), what is the minimum rating required for the service disconnecting means of a one-family dwelling?

60 amperes
100 amperes
150 amperes
200 amperes

NEC Reference: NEC 230.79(C)

Question 5: Per NEC 230.90(A), overload protection for service conductors must be provided:

In each ungrounded service conductor
Only on the grounded (neutral) conductor
Only at the utility transformer
Only where the service exceeds 400 amperes

NEC Reference: NEC 230.90(A)

Question 6: Per NEC 230.95, ground-fault protection of equipment (GFPE) is required for service disconnects rated 1000 amperes or more on solidly grounded wye systems where the voltage to ground:

Exceeds 150 volts to ground but does not exceed 600 volts phase-to-phase
Is exactly 120 volts to ground
Is below 50 volts to ground
Does not matter — GFPE is required on every service

NEC Reference: NEC 230.95

Question 7: Per the definitions in NEC Article 100, the "service point" is best described as:

The point of connection between the utility and the premises wiring
The main panel inside the building
The meter base only
Any junction box on the property

NEC Reference: NEC Article 100

Question 8: Per NEC 230.24(B)(2), what minimum vertical clearance is required for service-drop conductors over public streets, alleys, roads, and areas subject to truck traffic?

10 feet
12 feet
15 feet
18 feet

NEC Reference: NEC 230.24(B)(2)

Question 9: A dry-type transformer rated 600 volts or less has a primary full-load current of 20 amperes and is protected only on the primary side. Per NEC Table 450.3(B), the primary overcurrent device must not exceed what percentage of the primary current?

100 percent
125 percent
167 percent
250 percent

NEC Reference: NEC Table 450.3(B)

Question 10: A control transformer has a primary full-load current of less than 9 amperes and is protected only on the primary side. Per NEC Table 450.3(B), the primary overcurrent device may be set up to what percentage of primary current?

125 percent
150 percent
167 percent
200 percent

NEC Reference: NEC Table 450.3(B)

Question 11: Per NEC 450.9, transformers must be installed so that:

Adequate ventilation is provided to dissipate the transformer's full-load losses
They are always installed outdoors regardless of type
No airflow clearance is needed for dry-type units
They may be fully enclosed in a sealed, unventilated box

NEC Reference: NEC 450.9

Question 12: Per NEC 240.21(C)(6), the 25-foot secondary conductor tap rule for transformers allows secondary conductors to run up to 25 feet without overcurrent protection at the transformer, provided which condition is met?

The secondary conductor ampacity, adjusted by the transformer's turns ratio, is at least equal to the primary OCPD rating, with physical protection and a single terminating OCPD
The conductors may be any length as long as they are copper
No ampacity relationship to the primary OCPD is required
Overcurrent protection is never required anywhere on the secondary

NEC Reference: NEC 240.21(C)(6)

Question 13: Per NEC 450.21(A), a dry-type transformer rated 112.5 kVA or less, installed indoors, must be separated from combustible material by at least:

6 inches
12 inches
24 inches
36 inches

NEC Reference: NEC 450.21(A)

Question 14: True or false: per NEC 210.8(A)(1), all 125-volt, 15- and 20-ampere receptacles installed in dwelling unit bathrooms must have GFCI protection.

True
False
Only in half-bathrooms
Only if the bathroom has a bathtub

NEC Reference: NEC 210.8(A)(1)

Question 15: Per NEC 210.8(A)(2), GFCI protection is required for 125-volt, 15- and 20-ampere receptacles in which of these dwelling locations?

Garages and grade-level accessory buildings
Only heated living spaces
Only the second floor of a dwelling
Only formal dining rooms

NEC Reference: NEC 210.8(A)(2)

Question 16: Per NEC 210.8(A)(6), GFCI protection is required for dwelling unit receptacles that:

Serve kitchen countertop surfaces
Are located in a hallway closet
Supply a hardwired smoke detector
Are located above 6.5 feet in a garage

NEC Reference: NEC 210.8(A)(6)

Question 17: Per NEC 210.8(A)(7), GFCI protection is required for receptacles installed within what distance of the outside edge of any sink (not just kitchen sinks)?

3 feet
6 feet
10 feet
12 feet

NEC Reference: NEC 210.8(A)(7)

Question 18: The 2020 NEC added a brand-new requirement in 210.8(D) for GFCI protection on outlets supplying which dwelling unit appliance?

Garbage disposals
Dishwashers
Refrigerators
Range hoods

NEC Reference: NEC 210.8(D)

Question 19: The 2020 NEC expanded the list in 210.8(A) to newly require GFCI protection for dwelling unit receptacles located in which area, not previously listed?

Laundry areas
Formal living rooms
Attics with no equipment
Interior hallways

NEC Reference: NEC 210.8(A)(10)

Question 20: Per NEC 210.8(A)(9), GFCI protection is required for receptacles installed within what distance of the outside edge of a bathtub or shower stall?

3 feet
6 feet
8 feet
10 feet

NEC Reference: NEC 210.8(A)(9)

Question 21: Per NEC 406.4(D)(2), when a non-grounding-type receptacle is replaced with a GFCI receptacle where no equipment ground exists, the new receptacle must be marked:

"No Equipment Ground"
"Danger — High Voltage"
"Tamper Resistant"
No marking is required

NEC Reference: NEC 406.4(D)(2)

Question 22: True or false: per NEC 210.12(A), 120-volt, 15- and 20-ampere branch circuits supplying outlets in dwelling unit bedrooms must have arc-fault circuit-interrupter (AFCI) protection.

True
False
Only in basement bedrooms
Only for circuits over 20 amperes

NEC Reference: NEC 210.12(A)

Question 23: Besides bedrooms, NEC 210.12(A) also requires AFCI protection for 120-volt, 15- and 20-ampere circuits supplying outlets in which of the following dwelling unit areas?

Kitchens, family rooms, dining rooms, living rooms, and similar habitable rooms
Only unfinished attics
Only exterior receptacles
Only detached garages

NEC Reference: NEC 210.12(A)

Question 24: Per NEC 210.12(A), the required AFCI protection for dwelling unit branch circuits must be provided by which type of device?

A listed combination-type AFCI device
Any GFCI receptacle
A standard thermal-magnetic breaker
A fuse rated for arc protection

NEC Reference: NEC 210.12(A)

Question 25: True or false: a laundry area receptacle outlet in a dwelling unit can be required to have BOTH GFCI protection (per 210.8) and AFCI protection (per 210.12) at the same time.

True
False
Only in commercial laundries
Only if the circuit is over 30 amperes

NEC Reference: NEC 210.8(A) / 210.12(A)

Question 26: Per NEC 210.12(B), when an existing branch circuit serving one of the areas listed in 210.12(A) is extended or modified, what is generally required?

The extended/modified circuit must receive AFCI protection by a listed method
No AFCI protection is ever required for existing circuit work
Only the new outlet needs protection, never the rest of the circuit
AFCI protection is optional at the homeowner's discretion

NEC Reference: NEC 210.12(B)

Question 27: True or false: per NEC 210.8(A)(3), all 125-volt, 15- and 20-ampere receptacles installed outdoors at a dwelling unit require GFCI protection.

True
False
Only front-yard receptacles
Only receptacles mounted below 3 feet

NEC Reference: NEC 210.8(A)(3)

Question 28: Per NEC 210.8(A)(4), GFCI protection is required for receptacles installed in which type of crawl space?

Crawl spaces at or below grade level
Only crawl spaces above the second floor
Only heated, finished crawl spaces
No crawl space ever requires GFCI protection

NEC Reference: NEC 210.8(A)(4)

Question 29: Per NEC 210.8(A)(5), GFCI protection is required for receptacles in unfinished portions of a dwelling unit basement, but which specific spaces are exempt from this requirement?

Receptacles dedicated to a permanently installed fire or burglar alarm system
Receptacles used for holiday lighting
Receptacles for a sump pump
Receptacles mounted above 6 feet

NEC Reference: NEC 210.8(A)(5)

Question 30: Which statement correctly distinguishes the purpose of a GFCI device from an AFCI device?

GFCI protects against shock from ground faults; AFCI protects against fire from arcing faults
They are two names for the exact same protective function
GFCI protects against fire; AFCI protects against shock
Neither device relates to personnel or fire safety

NEC Reference: NEC Article 100

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.

NEC 2020 Journeyman Practice Test 8

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NEC 2020 Journeyman Practice Test 8

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NEC 2020 Journeyman Practice Test 8 — Question List

Question 1: Per NEC 230.70(A)(1), the service disconnecting means must be installed at a location that is:

Question 2: Per NEC 230.24(B), what is the minimum vertical clearance required for service-drop conductors over residential property and driveways, where the voltage does not exceed 300 volts to ground?

Question 3: Per NEC 230.71(B), the service disconnecting means for each service permitted by 230.2 may consist of not more than how many switches or circuit breakers grouped at one location?

Question 4: Per NEC 230.79(C), what is the minimum rating required for the service disconnecting means of a one-family dwelling?

Question 5: Per NEC 230.90(A), overload protection for service conductors must be provided:

Question 6: Per NEC 230.95, ground-fault protection of equipment (GFPE) is required for service disconnects rated 1000 amperes or more on solidly grounded wye systems where the voltage to ground:

Question 7: Per the definitions in NEC Article 100, the "service point" is best described as:

Question 8: Per NEC 230.24(B)(2), what minimum vertical clearance is required for service-drop conductors over public streets, alleys, roads, and areas subject to truck traffic?

Question 9: A dry-type transformer rated 600 volts or less has a primary full-load current of 20 amperes and is protected only on the primary side. Per NEC Table 450.3(B), the primary overcurrent device must not exceed what percentage of the primary current?

Question 10: A control transformer has a primary full-load current of less than 9 amperes and is protected only on the primary side. Per NEC Table 450.3(B), the primary overcurrent device may be set up to what percentage of primary current?

Question 11: Per NEC 450.9, transformers must be installed so that:

Question 12: Per NEC 240.21(C)(6), the 25-foot secondary conductor tap rule for transformers allows secondary conductors to run up to 25 feet without overcurrent protection at the transformer, provided which condition is met?

Question 13: Per NEC 450.21(A), a dry-type transformer rated 112.5 kVA or less, installed indoors, must be separated from combustible material by at least:

Question 14: True or false: per NEC 210.8(A)(1), all 125-volt, 15- and 20-ampere receptacles installed in dwelling unit bathrooms must have GFCI protection.

Question 15: Per NEC 210.8(A)(2), GFCI protection is required for 125-volt, 15- and 20-ampere receptacles in which of these dwelling locations?

Question 16: Per NEC 210.8(A)(6), GFCI protection is required for dwelling unit receptacles that:

Question 17: Per NEC 210.8(A)(7), GFCI protection is required for receptacles installed within what distance of the outside edge of any sink (not just kitchen sinks)?

Question 18: The 2020 NEC added a brand-new requirement in 210.8(D) for GFCI protection on outlets supplying which dwelling unit appliance?

Question 19: The 2020 NEC expanded the list in 210.8(A) to newly require GFCI protection for dwelling unit receptacles located in which area, not previously listed?

Question 20: Per NEC 210.8(A)(9), GFCI protection is required for receptacles installed within what distance of the outside edge of a bathtub or shower stall?

Question 21: Per NEC 406.4(D)(2), when a non-grounding-type receptacle is replaced with a GFCI receptacle where no equipment ground exists, the new receptacle must be marked:

Question 22: True or false: per NEC 210.12(A), 120-volt, 15- and 20-ampere branch circuits supplying outlets in dwelling unit bedrooms must have arc-fault circuit-interrupter (AFCI) protection.

Question 23: Besides bedrooms, NEC 210.12(A) also requires AFCI protection for 120-volt, 15- and 20-ampere circuits supplying outlets in which of the following dwelling unit areas?

Question 24: Per NEC 210.12(A), the required AFCI protection for dwelling unit branch circuits must be provided by which type of device?

Question 25: True or false: a laundry area receptacle outlet in a dwelling unit can be required to have BOTH GFCI protection (per 210.8) and AFCI protection (per 210.12) at the same time.

Question 26: Per NEC 210.12(B), when an existing branch circuit serving one of the areas listed in 210.12(A) is extended or modified, what is generally required?

Question 27: True or false: per NEC 210.8(A)(3), all 125-volt, 15- and 20-ampere receptacles installed outdoors at a dwelling unit require GFCI protection.

Question 28: Per NEC 210.8(A)(4), GFCI protection is required for receptacles installed in which type of crawl space?

Question 29: Per NEC 210.8(A)(5), GFCI protection is required for receptacles in unfinished portions of a dwelling unit basement, but which specific spaces are exempt from this requirement?

Question 30: Which statement correctly distinguishes the purpose of a GFCI device from an AFCI device?

Key NEC References for This Test

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