1. What is the primary purpose of the National Electrical Code? A) To
establish maximum standards for electrical installations B) Practical
safeguarding of persons and property from hazards arising from the use of
electricity C) To generate revenue through permit fees D) To create
employment for electrical inspectors
ANSWER : B - NEC Article 90.1(A) states the purpose is practical
safeguarding of persons and property from hazards arising from the use of
electricity.
2. The NEC is updated on what cycle? A) Annually B) Every 2 years C)
Every 3 years D) Every 5 years
ANSWER : C - The NEC is revised and published every three years.
3. Which article covers general requirements for wiring methods? A)
Article 210 B) Article 250 C) Article 300 D) Article 310
ANSWER : C - Article 300 covers general requirements for wiring methods
and materials.
4. Mandatory rules in the NEC use which word? A) Should B) Shall C) May
D) Can
ANSWER : B - "Shall" indicates a mandatory requirement.
5. What does "approved" mean in the NEC? A) Listed by a testing
laboratory B) Acceptable to the authority having jurisdiction C) Meeting
manufacturer specifications D) Certified by a licensed electrician
ANSWER : B - "Approved" means acceptable to the authority having
jurisdiction (AHJ).
6. A dwelling unit is defined as a single unit providing complete and
independent living facilities for how many persons? A) One B) Two or more
C) One or more D) Four or more
ANSWER : C - NEC Article 100 defines a dwelling unit as providing facilities
for one or more persons.
,7. What is the minimum clearance required above a flat roof for service
conductors? A) 6 feet B) 8 feet C) 10 feet D) 12 feet
ANSWER : B - NEC 230.24(A) requires 8 feet minimum clearance above a
flat roof.
8. Receptacle outlets in dwelling unit kitchens must be supplied by at least
how many small-appliance branch circuits? A) One B) Two C) Three D)
Four
ANSWER : B - NEC 210.11(C)(1) requires at least two small-appliance
branch circuits.
9. The maximum overcurrent protection for 12 AWG copper conductors is:
A) 15 amperes B) 20 amperes C) 25 amperes D) 30 amperes
ANSWER : B - NEC 240.4(D) limits 12 AWG copper to 20 amperes.
10. GFCI protection is required for all 125-volt, single-phase, 15- and 20-
ampere receptacles in which dwelling location? A) Living rooms B)
Bedrooms C) Bathrooms D) Dining rooms
ANSWER : C - NEC 210.8(A)(1) requires GFCI protection in bathrooms.
11. The general lighting load for dwelling units is calculated at how many
volt-amperes per square foot? A) 2 VA B) 3 VA C) 4 VA D) 5 VA
ANSWER : B - NEC Table 220.12 specifies 3 VA per square foot for dwelling
units.
12. What is the minimum burial depth for rigid metal conduit under a
building? A) 0 inches (no requirement) B) 6 inches C) 12 inches D) 18 inches
ANSWER : A - NEC Table 300.5 shows no minimum burial depth under
buildings.
13. Conductors shall be protected against overcurrent in accordance with:
A) Their ampacity B) Their length C) Their color D) Their cost
ANSWER : A - NEC 240.4 requires conductors to be protected according to
their ampacity.
14. The minimum size equipment grounding conductor for a 100-ampere
circuit is: A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG
ANSWER : C - NEC Table 250.122 shows 8 AWG for 100-ampere
overcurrent device.
,15. Flexible cords shall be protected by an overcurrent device rated not
over: A) The ampacity of the cord B) 150% of the cord ampacity C) 200% of
the cord ampacity D) 300% of the cord ampacity
ANSWER : A - NEC 240.5 requires protection at the cord's ampacity.
16. The voltage drop on branch circuits should not exceed: A) 2% B) 3% C)
5% D) 10%
ANSWER : B - NEC 210.19(A) Informational Note No. 4 recommends 3% for
branch circuits.
17. Temporary wiring is permitted for a period not to exceed: A) 30 days B)
60 days C) 90 days D) 180 days
ANSWER : C - NEC 590.3(B) allows temporary wiring for 90 days.
18. The minimum number of receptacle outlets required in a dwelling unit
bathroom is: A) One B) Two C) Three D) No requirement
ANSWER : A - NEC 210.52(D) requires at least one receptacle outlet.
19. What is the maximum spacing between receptacle outlets in dwelling
unit living areas? A) 6 feet B) 10 feet C) 12 feet D) No more than 12 feet
measured horizontally
ANSWER : D - NEC 210.52(A)(1) requires receptacles so no point is more
than 6 feet from a receptacle (12 feet spacing).
20. The minimum clearance from a swimming pool edge to overhead
electrical conductors is: A) 10 feet B) 14.5 feet C) 18 feet D) 22.5 feet
ANSWER : D - NEC 680.8(A) requires 22.5 feet for certain conductors.
21. Arc-fault circuit interrupter (AFCI) protection is required for dwelling
unit: A) Kitchens only B) Bathrooms only C) All 120-volt, single-phase, 15-
and 20-ampere branch circuits supplying outlets in family rooms, dining rooms,
living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms,
closets, hallways, laundry areas, and similar rooms or areas D) Garages only
ANSWER : C - NEC 210.12(A) specifies these locations for AFCI protection.
22. What is the minimum height of receptacles above a kitchen countertop?
A) No minimum B) 12 inches C) 18 inches D) 20 inches
ANSWER : A - There is no minimum height specified; only maximum (20
inches per 210.52(C)(5)).
, 23. The grounded conductor must be: A) Red or black B) White or gray C)
Green D) Any color
ANSWER : B - NEC 200.6 requires white or gray for grounded conductors.
24. Equipment grounding conductors shall be identified by: A) A
continuous white outer finish B) A continuous green color or green with yellow
stripes C) Red tape D) Any color except white or green
ANSWER : B - NEC 250.119 requires green or green with yellow stripes.
25. The minimum size conductor for general use branch circuits is: A) 18
AWG B) 16 AWG C) 14 AWG D) 12 AWG
ANSWER : C - NEC 210.19(A) specifies 14 AWG copper as minimum for
branch circuits.
26. Switches controlling lighting loads must be rated at least: A) Equal to
the load B) 80% of the load C) 125% of the load D) 150% of the load
ANSWER : A - NEC 404.14(A) requires switches rated for the load
controlled.
27. The maximum number of disconnects permitted for a service is: A) Two
B) Four C) Six D) Eight
ANSWER : C - NEC 230.71 permits a maximum of six disconnects.
28. Type NM cable is permitted in: A) Commercial buildings over 3 stories B)
One- and two-family dwellings C) Exposed locations outdoors D) Wet locations
ANSWER : B - NEC 334.10 permits NM cable in one- and two-family
dwellings.
29. What is the minimum ampacity required for service conductors in a
dwelling unit? A) 60 amperes B) 100 amperes C) 150 amperes D) 200 amperes
ANSWER : B - NEC 230.79(C) requires minimum 100-ampere service for
dwellings.
30. Outdoor receptacles for dwelling units must have: A) GFCI protection B)
AFCI protection C) Weatherproof covers D) Both A and C
ANSWER : D - NEC 210.8(A)(3) requires GFCI, and 406.9(B)(1) requires
weatherproof covers.
establish maximum standards for electrical installations B) Practical
safeguarding of persons and property from hazards arising from the use of
electricity C) To generate revenue through permit fees D) To create
employment for electrical inspectors
ANSWER : B - NEC Article 90.1(A) states the purpose is practical
safeguarding of persons and property from hazards arising from the use of
electricity.
2. The NEC is updated on what cycle? A) Annually B) Every 2 years C)
Every 3 years D) Every 5 years
ANSWER : C - The NEC is revised and published every three years.
3. Which article covers general requirements for wiring methods? A)
Article 210 B) Article 250 C) Article 300 D) Article 310
ANSWER : C - Article 300 covers general requirements for wiring methods
and materials.
4. Mandatory rules in the NEC use which word? A) Should B) Shall C) May
D) Can
ANSWER : B - "Shall" indicates a mandatory requirement.
5. What does "approved" mean in the NEC? A) Listed by a testing
laboratory B) Acceptable to the authority having jurisdiction C) Meeting
manufacturer specifications D) Certified by a licensed electrician
ANSWER : B - "Approved" means acceptable to the authority having
jurisdiction (AHJ).
6. A dwelling unit is defined as a single unit providing complete and
independent living facilities for how many persons? A) One B) Two or more
C) One or more D) Four or more
ANSWER : C - NEC Article 100 defines a dwelling unit as providing facilities
for one or more persons.
,7. What is the minimum clearance required above a flat roof for service
conductors? A) 6 feet B) 8 feet C) 10 feet D) 12 feet
ANSWER : B - NEC 230.24(A) requires 8 feet minimum clearance above a
flat roof.
8. Receptacle outlets in dwelling unit kitchens must be supplied by at least
how many small-appliance branch circuits? A) One B) Two C) Three D)
Four
ANSWER : B - NEC 210.11(C)(1) requires at least two small-appliance
branch circuits.
9. The maximum overcurrent protection for 12 AWG copper conductors is:
A) 15 amperes B) 20 amperes C) 25 amperes D) 30 amperes
ANSWER : B - NEC 240.4(D) limits 12 AWG copper to 20 amperes.
10. GFCI protection is required for all 125-volt, single-phase, 15- and 20-
ampere receptacles in which dwelling location? A) Living rooms B)
Bedrooms C) Bathrooms D) Dining rooms
ANSWER : C - NEC 210.8(A)(1) requires GFCI protection in bathrooms.
11. The general lighting load for dwelling units is calculated at how many
volt-amperes per square foot? A) 2 VA B) 3 VA C) 4 VA D) 5 VA
ANSWER : B - NEC Table 220.12 specifies 3 VA per square foot for dwelling
units.
12. What is the minimum burial depth for rigid metal conduit under a
building? A) 0 inches (no requirement) B) 6 inches C) 12 inches D) 18 inches
ANSWER : A - NEC Table 300.5 shows no minimum burial depth under
buildings.
13. Conductors shall be protected against overcurrent in accordance with:
A) Their ampacity B) Their length C) Their color D) Their cost
ANSWER : A - NEC 240.4 requires conductors to be protected according to
their ampacity.
14. The minimum size equipment grounding conductor for a 100-ampere
circuit is: A) 12 AWG B) 10 AWG C) 8 AWG D) 6 AWG
ANSWER : C - NEC Table 250.122 shows 8 AWG for 100-ampere
overcurrent device.
,15. Flexible cords shall be protected by an overcurrent device rated not
over: A) The ampacity of the cord B) 150% of the cord ampacity C) 200% of
the cord ampacity D) 300% of the cord ampacity
ANSWER : A - NEC 240.5 requires protection at the cord's ampacity.
16. The voltage drop on branch circuits should not exceed: A) 2% B) 3% C)
5% D) 10%
ANSWER : B - NEC 210.19(A) Informational Note No. 4 recommends 3% for
branch circuits.
17. Temporary wiring is permitted for a period not to exceed: A) 30 days B)
60 days C) 90 days D) 180 days
ANSWER : C - NEC 590.3(B) allows temporary wiring for 90 days.
18. The minimum number of receptacle outlets required in a dwelling unit
bathroom is: A) One B) Two C) Three D) No requirement
ANSWER : A - NEC 210.52(D) requires at least one receptacle outlet.
19. What is the maximum spacing between receptacle outlets in dwelling
unit living areas? A) 6 feet B) 10 feet C) 12 feet D) No more than 12 feet
measured horizontally
ANSWER : D - NEC 210.52(A)(1) requires receptacles so no point is more
than 6 feet from a receptacle (12 feet spacing).
20. The minimum clearance from a swimming pool edge to overhead
electrical conductors is: A) 10 feet B) 14.5 feet C) 18 feet D) 22.5 feet
ANSWER : D - NEC 680.8(A) requires 22.5 feet for certain conductors.
21. Arc-fault circuit interrupter (AFCI) protection is required for dwelling
unit: A) Kitchens only B) Bathrooms only C) All 120-volt, single-phase, 15-
and 20-ampere branch circuits supplying outlets in family rooms, dining rooms,
living rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms,
closets, hallways, laundry areas, and similar rooms or areas D) Garages only
ANSWER : C - NEC 210.12(A) specifies these locations for AFCI protection.
22. What is the minimum height of receptacles above a kitchen countertop?
A) No minimum B) 12 inches C) 18 inches D) 20 inches
ANSWER : A - There is no minimum height specified; only maximum (20
inches per 210.52(C)(5)).
, 23. The grounded conductor must be: A) Red or black B) White or gray C)
Green D) Any color
ANSWER : B - NEC 200.6 requires white or gray for grounded conductors.
24. Equipment grounding conductors shall be identified by: A) A
continuous white outer finish B) A continuous green color or green with yellow
stripes C) Red tape D) Any color except white or green
ANSWER : B - NEC 250.119 requires green or green with yellow stripes.
25. The minimum size conductor for general use branch circuits is: A) 18
AWG B) 16 AWG C) 14 AWG D) 12 AWG
ANSWER : C - NEC 210.19(A) specifies 14 AWG copper as minimum for
branch circuits.
26. Switches controlling lighting loads must be rated at least: A) Equal to
the load B) 80% of the load C) 125% of the load D) 150% of the load
ANSWER : A - NEC 404.14(A) requires switches rated for the load
controlled.
27. The maximum number of disconnects permitted for a service is: A) Two
B) Four C) Six D) Eight
ANSWER : C - NEC 230.71 permits a maximum of six disconnects.
28. Type NM cable is permitted in: A) Commercial buildings over 3 stories B)
One- and two-family dwellings C) Exposed locations outdoors D) Wet locations
ANSWER : B - NEC 334.10 permits NM cable in one- and two-family
dwellings.
29. What is the minimum ampacity required for service conductors in a
dwelling unit? A) 60 amperes B) 100 amperes C) 150 amperes D) 200 amperes
ANSWER : B - NEC 230.79(C) requires minimum 100-ampere service for
dwellings.
30. Outdoor receptacles for dwelling units must have: A) GFCI protection B)
AFCI protection C) Weatherproof covers D) Both A and C
ANSWER : D - NEC 210.8(A)(3) requires GFCI, and 406.9(B)(1) requires
weatherproof covers.
