IEC 2A Exam Questions and Answers With Verified Solutions 2025
The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding
electrode system (earth) is to ___.
I. cause the quick operation of OCPDs
II.keep all metal parts at the same voltage
III. limit voltage surges - ✔✔e. II & III only
A metal enclosure surrounding electrically operated equipment ___.
a. is required to be grounded
b. protects the equipment from physical damage
c. provides protection for people against accidental contact with live parts - ✔✔d. all of these
The amount of current that flows in any circuit is determined by the voltage and resistance of the circuit.
Select one:
a. True
b. False - ✔✔a. True
___ is defined as case or housing of apparatus, or the fence or walls surrounding an installation to
prevent personnel from accidentally contacting energized parts or to protect the equipment from
physical damage.
Select one:
a. Inaccessible
b. Guarded
c. Isolated
d. Enclosure - ✔✔: Enclosure
The circuit installed in a run of PVC conduit requires a 6 AWG equipment grounding conductor.
However, a 12 AWG was installed instead. Using the 12 instead of the 6 AWG wire will ___ the amount
of time required for a circuit breaker to open when a ground fault occurs.
,Select one:
a. increase
b. decrease
c. have no effect on - ✔✔increase
Providing a low impedance ground return path ___ when a ground-fault occurs.
Select one:
a. has no effect on the circuit current
b. permits a high current to flow
c. limits the amount of current to a small amount - ✔✔permits a high current to flow
In a run of conduit, when couplings and connectors are loose this will ___ the amount of time required
for a circuit breaker to open when a short-circuit occurs.
Select one:
a. have no effect on
b. increase
c. decrease - ✔✔have no effect on
The plans indicate that you should install a 300-amp branch circuit in Schedule 40 PVC with a 4 AWG
equipment grounding conductor. However, you did not have any 4 AWG wire so you pulled in 10 AWG
instead. With a load connected, the normal circuit current will be ___ with the 10 AWG EGC (compared
to using a 4 AWG EGC).
Select one:
a. the same
b. less
c. greater - ✔✔the same
The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding
electrode system (earth) is to ___.I. cause the quick operation of OCPDsII. keep all metal parts at the
same voltageIII. limit voltage surges
Select one:
,a. I only
b. I, II & III
c. I & III only
d. I & II only
e. II & III only - ✔✔II & III only
A metal enclosure surrounding electrically operated equipment ___.
Select one:
a. is required to be grounded
b. protects the equipment from physical damage
c. provides protection for people against accidental contact with live parts
d. all of these - ✔✔all of these
Refer to Figure 205.15. The flex used between the breaker enclosure and the motor contains three 350
kcmil conductors. The minimum size of the EGC between the 700-A breaker and the motor is ___.
Select one:
a. 350 kcmil
b. 3/0 AWG
c. 2 AWG
d. 1/0 AWG
e. none of these - ✔✔1/0 AWG
Three 4/0 AWG conductors are installed in the flex between the breaker enclosure, containing a 500-A
breaker, and the motor. The smallest EGC that can be installed in the flex shown in Figure 205.15 is ___.
Select one:
a. 2/0 AWG
b. 4/0 AWG
c. 1 AWG
d. 3 AWG
e. none of these - ✔✔none of these
, The plans indicate that you should install a 200-Amp branch circuit in Schedule 40 PVC with a 6 AWG
equipment grounding conductor. However you did not have any 6 AWG wire so you pulled in 12 AWG
instead. Compared to the correct circuit (with the 6 AWG EGC) your circuit will take ___ time for the
circuit breaker to open when a ground fault occurs.
Select one:
a. the same amount of
b. less
c. more - ✔✔: more
Refer to Figure 205.11. The 200-A safety switch contains 125-amp fuses. The raceways used between
the switch and the 3Ø motor contain three 2 AWG conductors. The minimum size of the EGC between
the safety switch and the motor is ___ AWG.
Select one:
a. 4
b. 6
c. 8
d. 2
e. 3 - ✔✔6
Refer to Figure 205.14. Load 1 is supplied from a 100 A circuit breaker with 3 AWG conductors. Load 2 is
supplied from a 350-Amp breaker with 500 kcmil conductors. Both loads are 3-ph, 3-wire. The smallest
grounding conductor that can be installed between the pull box and Load 1 is ___ AWG.
Select one:
a. 6
b. 2
c. 4
d. 8
e. 3 - ✔✔8
Refer to Figure 205.14. Load 1 is supplied from a 150-A circuit breaker with 1 AWG conductors. Load 2 is
supplied from a 300-Amp breaker with 4/0 AWG conductors. Both loads are 3-ph, 3-wire. Where only
The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding
electrode system (earth) is to ___.
I. cause the quick operation of OCPDs
II.keep all metal parts at the same voltage
III. limit voltage surges - ✔✔e. II & III only
A metal enclosure surrounding electrically operated equipment ___.
a. is required to be grounded
b. protects the equipment from physical damage
c. provides protection for people against accidental contact with live parts - ✔✔d. all of these
The amount of current that flows in any circuit is determined by the voltage and resistance of the circuit.
Select one:
a. True
b. False - ✔✔a. True
___ is defined as case or housing of apparatus, or the fence or walls surrounding an installation to
prevent personnel from accidentally contacting energized parts or to protect the equipment from
physical damage.
Select one:
a. Inaccessible
b. Guarded
c. Isolated
d. Enclosure - ✔✔: Enclosure
The circuit installed in a run of PVC conduit requires a 6 AWG equipment grounding conductor.
However, a 12 AWG was installed instead. Using the 12 instead of the 6 AWG wire will ___ the amount
of time required for a circuit breaker to open when a ground fault occurs.
,Select one:
a. increase
b. decrease
c. have no effect on - ✔✔increase
Providing a low impedance ground return path ___ when a ground-fault occurs.
Select one:
a. has no effect on the circuit current
b. permits a high current to flow
c. limits the amount of current to a small amount - ✔✔permits a high current to flow
In a run of conduit, when couplings and connectors are loose this will ___ the amount of time required
for a circuit breaker to open when a short-circuit occurs.
Select one:
a. have no effect on
b. increase
c. decrease - ✔✔have no effect on
The plans indicate that you should install a 300-amp branch circuit in Schedule 40 PVC with a 4 AWG
equipment grounding conductor. However, you did not have any 4 AWG wire so you pulled in 10 AWG
instead. With a load connected, the normal circuit current will be ___ with the 10 AWG EGC (compared
to using a 4 AWG EGC).
Select one:
a. the same
b. less
c. greater - ✔✔the same
The primary purpose of grounding metal equipment enclosures and metal raceways to the grounding
electrode system (earth) is to ___.I. cause the quick operation of OCPDsII. keep all metal parts at the
same voltageIII. limit voltage surges
Select one:
,a. I only
b. I, II & III
c. I & III only
d. I & II only
e. II & III only - ✔✔II & III only
A metal enclosure surrounding electrically operated equipment ___.
Select one:
a. is required to be grounded
b. protects the equipment from physical damage
c. provides protection for people against accidental contact with live parts
d. all of these - ✔✔all of these
Refer to Figure 205.15. The flex used between the breaker enclosure and the motor contains three 350
kcmil conductors. The minimum size of the EGC between the 700-A breaker and the motor is ___.
Select one:
a. 350 kcmil
b. 3/0 AWG
c. 2 AWG
d. 1/0 AWG
e. none of these - ✔✔1/0 AWG
Three 4/0 AWG conductors are installed in the flex between the breaker enclosure, containing a 500-A
breaker, and the motor. The smallest EGC that can be installed in the flex shown in Figure 205.15 is ___.
Select one:
a. 2/0 AWG
b. 4/0 AWG
c. 1 AWG
d. 3 AWG
e. none of these - ✔✔none of these
, The plans indicate that you should install a 200-Amp branch circuit in Schedule 40 PVC with a 6 AWG
equipment grounding conductor. However you did not have any 6 AWG wire so you pulled in 12 AWG
instead. Compared to the correct circuit (with the 6 AWG EGC) your circuit will take ___ time for the
circuit breaker to open when a ground fault occurs.
Select one:
a. the same amount of
b. less
c. more - ✔✔: more
Refer to Figure 205.11. The 200-A safety switch contains 125-amp fuses. The raceways used between
the switch and the 3Ø motor contain three 2 AWG conductors. The minimum size of the EGC between
the safety switch and the motor is ___ AWG.
Select one:
a. 4
b. 6
c. 8
d. 2
e. 3 - ✔✔6
Refer to Figure 205.14. Load 1 is supplied from a 100 A circuit breaker with 3 AWG conductors. Load 2 is
supplied from a 350-Amp breaker with 500 kcmil conductors. Both loads are 3-ph, 3-wire. The smallest
grounding conductor that can be installed between the pull box and Load 1 is ___ AWG.
Select one:
a. 6
b. 2
c. 4
d. 8
e. 3 - ✔✔8
Refer to Figure 205.14. Load 1 is supplied from a 150-A circuit breaker with 1 AWG conductors. Load 2 is
supplied from a 300-Amp breaker with 4/0 AWG conductors. Both loads are 3-ph, 3-wire. Where only
