Question 1: What is the maximum number of receptacles allowed on a 15-ampere branch circuit operating at 120 volts?
- 10
- 11
- 13
- 12
NEC Reference: NEC 220.14(I)
NEC_PRACTICE
NEC 2023
NEC Code Practice Test 1
Free online NEC code practice test with 30 questions covering essential National Electrical Code rules for electricians. Topics include GFCI and AFCI protection, working clearances, receptacle spacing, grounding, NM cable installation, branch circuit rules, and more. Based on NEC 2023 — ideal prep for journeyman and master electrician licensing exams.
TOPICS COVERED
NEC Practice Tests
Branch Circuits
Installation
Wiring Methods
Services
Lighting
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TimeNEC Code Practice Test 1 — Question List
Question 2: In a panel board a two-pole circuit breaker is considered to be ...................
- A single over current device
- Two Over current devices
- Four over current devices
NEC Reference: NEC 408.54
Question 3: What is the minimum size service disconnecting means for a single family dwelling unit with an initial load of 10 KVA or more?
- 100 ampere for a 3 wire service
- 100 ampere for a 2 wire service
- 50 ampere for a 3 wire service
- 50 ampere for a 2-wire service
NEC Reference: NEC 230.79
Question 4: At which of the following percentage the demand factor for six house hold electric cloth dryers is calculated?
- 75 %
- 70 %
- 85 %
- 80 %
NEC Reference: NEC 220.54
Question 5: What is the unit load in volt ampere per square foot for stores?
- 2 VA
- 3 VA
- 4 VA
- 5 VA
NEC Reference: NEC 220.12
Question 6: What is the maximum instantaneous voltage that a low voltage lighting system cannot exceed under any load conditions?
- 34 volts
- 30 volts
- 38.2 volts
- 42.4 volts
NEC Reference: NEC 411.2
Question 7: A 25 amperes branch circuit connected with a cord-and-plug-connected appliance. What is the maximum ampere rating permitted for the appliance?
- 20 amperes
- 22.5 amperes
- 25 amperes
- 18.5 amperes
NEC Reference: NEC 210.23(A)(1)
Question 8: Per NEC 220.60, when two loads will NOT operate at the same time (noncoincident loads), the smaller of the two loads can be omitted from the load calculation.
- True
- False
NEC Reference: NEC 220.60
Question 9: As per NEC central heating equipment can be supplied by a multi-wire branch circuit?
- False
- True
NEC Reference: NEC 210.11(C)(4)
Question 10: The circuit breakers enclosures must be mounted in horizontal position.
- True
- False
NEC Reference: NEC 240.81
Question 11: Which of the following locations in a dwelling unit requires GFCI protection on all 15- and 20-ampere, 125-volt receptacles?
- Bedrooms
- Dining rooms
- Bathrooms
- Living rooms
NEC Reference: NEC 210.8(A)(1)
Question 12: Per NEC 210.12(A), in a dwelling unit, arc-fault circuit-interrupter (AFCI) protection is required on 120-volt, 15- and 20-ampere branch circuits supplying outlets or devices in which areas?
- Garages and attics only
- Bedrooms only
- All areas of the dwelling unit
- Kitchens and bathrooms only
NEC Reference: NEC 210.12(A)
Question 13: Per NEC 110.26(A)(1), what is the minimum depth of working space required in front of a 120-volt to 250-volt residential electrical panel (Condition 1 — live parts on one side only)?
- 2 ft
- 3 ft
- 4 ft
- 6 ft
NEC Reference: NEC 110.26(A)(1)
Question 14: In a dwelling unit, receptacle outlets must be placed along the walls so that no point along the floor line is more than _______ from a receptacle outlet.
- 4 feet
- 6 feet
- 8 feet
- 10 feet
NEC Reference: NEC 210.52(A)(1)
Question 15: In a standard residential NM cable (Romex), which conductor color identifies the grounded (neutral) conductor?
- Black
- Red
- White
- Green
NEC Reference: NEC 200.6(A)
Question 16: Per NEC 334.30, non-metallic sheathed cable (NM cable / Romex) must be supported and secured at intervals not exceeding:
- 2½ ft
- 4½ ft
- 6 ft
- 8 ft
NEC Reference: NEC 334.30
Question 17: Per NEC 230.9(A), how close can open service entrance conductors be installed to a window that is designed to be opened?
- No closer than 1 ft
- No closer than 2 ft
- No closer than 3 ft
- No closer than 5 ft
NEC Reference: NEC 230.9(A)
Question 18: Per NEC 406.4(D)(1), in which areas of a dwelling unit are tamper-resistant receptacles required?
- Only in rooms regularly used by small children
- Only in kitchens and bathrooms
- All areas of the dwelling unit (as specified in NEC 210.52)
- Only in areas accessible from outside the building
NEC Reference: NEC 406.4(D)(1)
Question 19: Per NEC 410.16(A), which type of light fixture is NOT permitted inside a clothes closet?
- Completely enclosed surface-mounted LED fixture
- Recessed incandescent fixture with a completely enclosed lamp
- Pendant (hanging) luminaire with an exposed bulb
- Surface-mounted fluorescent fixture
NEC Reference: NEC 410.16(A)
Question 20: Per NEC 250.50, if a building has more than one grounding electrode (such as a metal water pipe and a concrete-encased electrode), what must be done with all available electrodes?
- Use only the single best electrode and ignore the others
- They must all be bonded together to form the grounding electrode system
- Only one electrode is required by code
- Install each electrode as a separate independent ground
NEC Reference: NEC 250.50
Question 21: The image shows the back of a standard 120-volt duplex receptacle. Which terminal should the WHITE (grounded/neutral) conductor connect to?
- The brass-colored (gold) terminal screws
- The silver-colored terminal screws
- The green screw
- Either side — polarity does not matter for standard receptacles
NEC Reference: NEC 200.11
Question 22: When calculating box fill per NEC 314.16(B)(4), a single duplex receptacle or a single switch (one yoke/strap) counts as how many conductors?
- Zero — devices are not counted in box fill calculations
- One conductor
- Two conductors
- Four conductors
NEC Reference: NEC 314.16(B)(4)
Question 23: Per NEC 230.70(A)(1), where must the service disconnecting means (main breaker or main fuses) be located?
- Always outside the building at the utility meter
- In the basement, away from public access
- At a readily accessible location outside, or inside nearest the service entry point
- At the center of the building for equal wire run lengths
NEC Reference: NEC 230.70(A)(1)
Question 24: According to NEC 400.12, flexible cords and extension cords are NOT permitted to be used as a substitute for what?
- Powering portable tools on a job site
- Temporary holiday or seasonal lighting
- Permanent (fixed) building wiring
- Connecting listed appliances to wall receptacles
NEC Reference: NEC 400.12
Question 25: Per NEC 210.52(D), at least how many receptacle outlets are required in the bathroom of a dwelling unit?
- None — bathrooms do not require receptacles
- At least one
- At least two
- At least three
NEC Reference: NEC 210.52(D)
Question 26: Per NEC 210.8(A)(2), GFCI protection is required for all 15- and 20-ampere, 125-volt receptacles located in which of the following dwelling unit areas?
- Dining rooms
- Garages
- Bedrooms
- Hallways
NEC Reference: NEC 210.8(A)(2)
Question 27: In an electrical installation, a green-colored or bare copper conductor is used as the:
- Grounded (neutral) conductor
- Ungrounded (hot) conductor
- Equipment grounding conductor
- High-leg (wild-leg) conductor
NEC Reference: NEC 250.119
Question 28: Per NEC 300.15, where must all wire splices (conductor connections) be made?
- Anywhere along the wire run — just wrap with electrical tape
- Inside an accessible junction box, outlet box, or device box
- Inside the wall cavity, away from any box
- At the main electrical panel only
NEC Reference: NEC 300.15
Question 29: Per NEC 210.11(C)(3), the required 20-ampere bathroom branch circuit in a dwelling unit is permitted to supply:
- Bathroom receptacles and the bathroom light fixture
- Bathroom receptacle outlets only — no other outlets on this circuit
- Any outlets located in the same room as the bathroom
- Bathroom and hallway receptacles together
NEC Reference: NEC 210.11(C)(3)
Question 30: The image shows a circuit breaker with the label "2P — 20A — 120/240V." What type of circuit does this breaker protect?
- Two separate 120-volt, 20-ampere circuits sharing one breaker
- A single 240-volt (or 120/240V), 20-ampere circuit
- A 200-ampere main service disconnect
- Two phases of a commercial 3-phase system
NEC Reference: NEC 240.6
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