NFPA 70 NEC Residential Electrician
Exam Prep
2026_2027
Expert-Verified Questions and
Answers
(With A+ Grades Guarantee)
,Given: A straight pull of size 4 AWG and larger conductors D. 24 in. x 24 in.
is to made in a junction box that will have a trade size 3 in.
conduit and two (2) trade size 2 in. conduits entering on [ 314.28(A)(1)]
the same 3 in. (largest conduit) × 8 = 24 inches
side and exiting on the opposite wall. No splices or
terminations will be made in the box. Which of the
following listed junction boxes is the MINIMUM required for
this installation?
A. 18 in. x 12 in.
B. 20 in. × 18 in.
C. 20 in. x 12 in.
D. 24 in. x 24 in.
Where a conductor is marked RHW-2 on the insulation, D. The conductor has a maximum operating temperature of 90°C.
what does the -2 represent?
A. The cable has 2 conductors. [Table 310.104(A)]
B. The conductor is double insulated.
C. The conductor has a nylon outer jacket.
D. The conductor has a maximum operating temperature
of 90°C.
Apply the general method of calculation for dwellings and D.23kw
determine the demand load, in kW, on the ungrounded 19 kW
service-entrance conductors for four (4) household electric - 12 kW = 7 kW x 5%
ranges rated 19 kW each. = 35% increase in Column C
A. 34 kW 17 kW (4 appliances in Col. C) x 135% = 22.95 kW demand [Table 220.55 & note 1]
B. 17 kW
C. 38 kW
D. 23 kW
Where ungrounded conductors are run in parallel in B. run in parallel in each raceway
multiple raceways, the equipment grounding conductor,
where used, shall be [250.122(F)(b)]
A. omitted
B. run in parallel in each raceway
C. installed in one raceway only
D. bare
145
Where track lighting is installed in a continuous row, each B. 4 feet
individual section of NOT more than _______ in length
shall be securely supported. [410.154]
A. 2 feet
B. 4 feet
C. 6 feet
D. 8 feet
Given: A flexible metal conduit (FMC) to be installed will A.3 in
contain three (3) size 400 kcmil THWN copper conductors 250 kcmil THWN - 0.3970 sq. in. x 1 = 0.3970 sq. in.
and one (1) size 250 kcmil copper conductor. Where the 400 kcmil THWN - 0.5863 sq. in. x 3 = 1.7589 sq. in.
FMC is more than 24 inches long, what MINIMUM trade Total = 2.1559 sq. in.
size FMC is permitted for this installation? A trade size 3 in. FMC with a permitted fill area of 2.827 sq. in.
A. 3 in @ 40% fill should be selected.[Chapter 9 table 4 & 5]
B. 3½ in.
C.2½ in.
D. 4 inches
Where a 2-gang box contains two (2) single-pole switches, B.277 volts
unless the box is equipped with permanently installed
barriers, voltage between the switches shall NOT be in [404.8(B)]
excess of ____________
A. 120 volts
B. 277 volts
C. 480 volts
D. 240 volts
, Where electrical metallic tubing (EMT) is installed under C. 1 1/2 in.
metal-corrugated sheet roofing decking, a clearance of at
LEAST _________ [300.4(E)]
must be maintained between the top of the tubing and the
surface of the roof decking.
A. 1 in.
B. 1¼ in.
C. 1½ in.
D. 1¾ in.
Where nonmetallic conduit is used to enclose conductors C. 8 AWG
supplying a
wet-niche luminaire located in a permanently installed [680.23(B)(2)(b)]
swimming pool, a size ________ insulated copper
grounding conductor shall be installed in the conduit,
unless a listed low-voltage lighting system not requiring
grounding is used.
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
Where multiple driven ground rods are used to form the B. 6 feet
grounding electrode system, in order to maintain an
effective grounding electrode system, they shall NOT be [250.53(A)(3)]
less than________apart.
A. 4 feet
B. 6 feet
C. 8 feet
D. 10 feet
According to the NEC®, flat conductor cable (FCC) is C. both I and II
permitted
to be used for: [324.10(A)]
I. general-purpose circuit conductors.
I. appliance circuit conductors.
A. I only
B. II only
C. both I and II
D. neither I nor II
All of the following copper conductors are to be installed in A. 2in
an
electrical metallic tubing (EMT) ten (10) feet long: [Chapter 9 tables 4 & 5]
* 24 - size 10 AWG THHW
* 10 - size 10 AWG THHN Size 10 AWG THHW = .0243 sq. in. x 24 = 0.5832 sq. in.
* 14 - size 12 AWG THHN Size 10 AWG THHN = .0211 sq. in. x 10 = 0.2110 sq. in.
Determine the MINIMUM trade size MT required. Size 12 AWG THHN = .0133 sq. in. x 14 = 0.1865 50. In.
A. 2 in. Total = 0.9807 sq. in.
B. 2½ in. 2 in. EMT with a 40% allowable fill of 1.342 sq. in, should be selected.
C.3 in.
D. 3½ in.
Where a direct burial cable has a voltage of 45 kV, the C. 42 inches
NEC® mandates the MINIMUM burial depth of the cable to
be at LEAST ______ [table 300.50, column 1]
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
Exam Prep
2026_2027
Expert-Verified Questions and
Answers
(With A+ Grades Guarantee)
,Given: A straight pull of size 4 AWG and larger conductors D. 24 in. x 24 in.
is to made in a junction box that will have a trade size 3 in.
conduit and two (2) trade size 2 in. conduits entering on [ 314.28(A)(1)]
the same 3 in. (largest conduit) × 8 = 24 inches
side and exiting on the opposite wall. No splices or
terminations will be made in the box. Which of the
following listed junction boxes is the MINIMUM required for
this installation?
A. 18 in. x 12 in.
B. 20 in. × 18 in.
C. 20 in. x 12 in.
D. 24 in. x 24 in.
Where a conductor is marked RHW-2 on the insulation, D. The conductor has a maximum operating temperature of 90°C.
what does the -2 represent?
A. The cable has 2 conductors. [Table 310.104(A)]
B. The conductor is double insulated.
C. The conductor has a nylon outer jacket.
D. The conductor has a maximum operating temperature
of 90°C.
Apply the general method of calculation for dwellings and D.23kw
determine the demand load, in kW, on the ungrounded 19 kW
service-entrance conductors for four (4) household electric - 12 kW = 7 kW x 5%
ranges rated 19 kW each. = 35% increase in Column C
A. 34 kW 17 kW (4 appliances in Col. C) x 135% = 22.95 kW demand [Table 220.55 & note 1]
B. 17 kW
C. 38 kW
D. 23 kW
Where ungrounded conductors are run in parallel in B. run in parallel in each raceway
multiple raceways, the equipment grounding conductor,
where used, shall be [250.122(F)(b)]
A. omitted
B. run in parallel in each raceway
C. installed in one raceway only
D. bare
145
Where track lighting is installed in a continuous row, each B. 4 feet
individual section of NOT more than _______ in length
shall be securely supported. [410.154]
A. 2 feet
B. 4 feet
C. 6 feet
D. 8 feet
Given: A flexible metal conduit (FMC) to be installed will A.3 in
contain three (3) size 400 kcmil THWN copper conductors 250 kcmil THWN - 0.3970 sq. in. x 1 = 0.3970 sq. in.
and one (1) size 250 kcmil copper conductor. Where the 400 kcmil THWN - 0.5863 sq. in. x 3 = 1.7589 sq. in.
FMC is more than 24 inches long, what MINIMUM trade Total = 2.1559 sq. in.
size FMC is permitted for this installation? A trade size 3 in. FMC with a permitted fill area of 2.827 sq. in.
A. 3 in @ 40% fill should be selected.[Chapter 9 table 4 & 5]
B. 3½ in.
C.2½ in.
D. 4 inches
Where a 2-gang box contains two (2) single-pole switches, B.277 volts
unless the box is equipped with permanently installed
barriers, voltage between the switches shall NOT be in [404.8(B)]
excess of ____________
A. 120 volts
B. 277 volts
C. 480 volts
D. 240 volts
, Where electrical metallic tubing (EMT) is installed under C. 1 1/2 in.
metal-corrugated sheet roofing decking, a clearance of at
LEAST _________ [300.4(E)]
must be maintained between the top of the tubing and the
surface of the roof decking.
A. 1 in.
B. 1¼ in.
C. 1½ in.
D. 1¾ in.
Where nonmetallic conduit is used to enclose conductors C. 8 AWG
supplying a
wet-niche luminaire located in a permanently installed [680.23(B)(2)(b)]
swimming pool, a size ________ insulated copper
grounding conductor shall be installed in the conduit,
unless a listed low-voltage lighting system not requiring
grounding is used.
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 6 AWG
Where multiple driven ground rods are used to form the B. 6 feet
grounding electrode system, in order to maintain an
effective grounding electrode system, they shall NOT be [250.53(A)(3)]
less than________apart.
A. 4 feet
B. 6 feet
C. 8 feet
D. 10 feet
According to the NEC®, flat conductor cable (FCC) is C. both I and II
permitted
to be used for: [324.10(A)]
I. general-purpose circuit conductors.
I. appliance circuit conductors.
A. I only
B. II only
C. both I and II
D. neither I nor II
All of the following copper conductors are to be installed in A. 2in
an
electrical metallic tubing (EMT) ten (10) feet long: [Chapter 9 tables 4 & 5]
* 24 - size 10 AWG THHW
* 10 - size 10 AWG THHN Size 10 AWG THHW = .0243 sq. in. x 24 = 0.5832 sq. in.
* 14 - size 12 AWG THHN Size 10 AWG THHN = .0211 sq. in. x 10 = 0.2110 sq. in.
Determine the MINIMUM trade size MT required. Size 12 AWG THHN = .0133 sq. in. x 14 = 0.1865 50. In.
A. 2 in. Total = 0.9807 sq. in.
B. 2½ in. 2 in. EMT with a 40% allowable fill of 1.342 sq. in, should be selected.
C.3 in.
D. 3½ in.
Where a direct burial cable has a voltage of 45 kV, the C. 42 inches
NEC® mandates the MINIMUM burial depth of the cable to
be at LEAST ______ [table 300.50, column 1]
A. 24 inches
B. 36 inches
C. 42 inches
D. 48 inches
