IEC FINAL EXAM YEAR 1 LATEST 2026 UPDATED QUESTIONS
AND VERIFIED 100% SOLUTIONS (2026/2027) |A+ GRADED
|GUARANTEED PASS
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads?
a.
The load of higher resistance would overheat and probably be damaged.
b.
The load of lesser resistance would overheat and probably be damaged.
c.
No effect until one load is turned off or opens.
d.
No effect.
a.
The load of higher resistance would overheat and probably be damaged.
Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13 amps
and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral?
a.3
b.13
c.29
d.16
3 Amps
The Code reference that specifies the type of disconnecting means (circuit breaker for
example) that can be used on a multiwire branch circuit that feeds devices mounted on the
same yoke [a stack switch or a duplex receptacle for example] is ___.Note: Select N/A (not
applicable) if there is not an NEC® requirement.
a.Article 100
b.240.15(B)(1)
c.404.8(A)
d.N/A
b. 240.15(B)(1)
1|Page
,Voltmeters are connected in ___ with the load when used to measure voltage across a load in
a circuit.
Parallel
The neutral has been removed from the neutral bar in the circuit shown in Figure 128.407.
Lamp 3 is connected in ___ with Lamps 1 and 2.
Series
(3 wire parallel circuits turn to series when the neutral is disconnected from the neutral bar)
What is the minimum number of receptacles required in an unfinished basement?
a.2
b.4
c.1
d.0
c. 1
The overall diameter (including insulation) of a 250 kcmil THHN/THWN copper conductor is
___ inches?
a..082
b..397
c..765
d..711
e..575
d. 711
NEC Chapter 9 Table 5 pg 701
What part of the NEC® is a reference for calculating conduit fill where all conductors are the
same size?
a.Article 100
b.Table 310.15(B)(16)
c.Annex C
d.Table 314.16(A)
c. Annex C
2|Page
, What is the minimum trade size Schedule 80 PVC required to contain four 8 AWG
THHN/THWN copper conductors?
a.1
b.3/4
c.11/4
d.11/2
e.none of these
b. 3/4
NEC Annex C
Eleven #12, five #10, and six #6 THHN/THWN conductors will be installed in a run of EMT. The
smallest trade size EMT you can use is ___.
a.11/2
b.21/2
c.11/4
d.2
e.1
c. 11/4
NEC Chapter 9 Tables 4 and 5
A short length of EMT is run between two panels. The ampacity values for the conductors in
this EMT need not be derated, as long as the length of the EMT does not exceed ___.
a.12 inches
b.18 inches
c.24 inches
c. 24 inches
An extension ladder should extend ___ feet above the top of the building and be secured.
a.four
b.three
c.two
d.one
3|Page
AND VERIFIED 100% SOLUTIONS (2026/2027) |A+ GRADED
|GUARANTEED PASS
What is the result if the neutral wire becomes open on a multiwire circuit having unequal
loads?
a.
The load of higher resistance would overheat and probably be damaged.
b.
The load of lesser resistance would overheat and probably be damaged.
c.
No effect until one load is turned off or opens.
d.
No effect.
a.
The load of higher resistance would overheat and probably be damaged.
Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13 amps
and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral?
a.3
b.13
c.29
d.16
3 Amps
The Code reference that specifies the type of disconnecting means (circuit breaker for
example) that can be used on a multiwire branch circuit that feeds devices mounted on the
same yoke [a stack switch or a duplex receptacle for example] is ___.Note: Select N/A (not
applicable) if there is not an NEC® requirement.
a.Article 100
b.240.15(B)(1)
c.404.8(A)
d.N/A
b. 240.15(B)(1)
1|Page
,Voltmeters are connected in ___ with the load when used to measure voltage across a load in
a circuit.
Parallel
The neutral has been removed from the neutral bar in the circuit shown in Figure 128.407.
Lamp 3 is connected in ___ with Lamps 1 and 2.
Series
(3 wire parallel circuits turn to series when the neutral is disconnected from the neutral bar)
What is the minimum number of receptacles required in an unfinished basement?
a.2
b.4
c.1
d.0
c. 1
The overall diameter (including insulation) of a 250 kcmil THHN/THWN copper conductor is
___ inches?
a..082
b..397
c..765
d..711
e..575
d. 711
NEC Chapter 9 Table 5 pg 701
What part of the NEC® is a reference for calculating conduit fill where all conductors are the
same size?
a.Article 100
b.Table 310.15(B)(16)
c.Annex C
d.Table 314.16(A)
c. Annex C
2|Page
, What is the minimum trade size Schedule 80 PVC required to contain four 8 AWG
THHN/THWN copper conductors?
a.1
b.3/4
c.11/4
d.11/2
e.none of these
b. 3/4
NEC Annex C
Eleven #12, five #10, and six #6 THHN/THWN conductors will be installed in a run of EMT. The
smallest trade size EMT you can use is ___.
a.11/2
b.21/2
c.11/4
d.2
e.1
c. 11/4
NEC Chapter 9 Tables 4 and 5
A short length of EMT is run between two panels. The ampacity values for the conductors in
this EMT need not be derated, as long as the length of the EMT does not exceed ___.
a.12 inches
b.18 inches
c.24 inches
c. 24 inches
An extension ladder should extend ___ feet above the top of the building and be secured.
a.four
b.three
c.two
d.one
3|Page
