IEC YEAR 2 FINAL EXAM QUESTIONS AND ANSWERS 2025
Refer to the information shown in Figure 234.151. When the tap for Motor 3 terminates in a safety
switch, the maximum permitted size for DETD fuses in this switch would be _____ A. - (ANSWER)15
Refer to the information shown in Figure 234.151. When the tap for Motor 1 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclosure would be ____ A. - (ANSWER)70
Refer to the information shown in Figure 234.151. When th etap for Motor 3 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclose would be ____ A. - (ANSWER)none of
these
Voltage Drop Scenario #3
The distance between the panel and a load is 150 feet. The circuit to the load consists of two 12 AWG
solid copper coated conductors that are connected to a 1-pole breaker in a 277/480-volt, 3Ø, 4-wire
panel and the neutral bar. The load draws 9.8 amps.
Refer to Voltage Drop Scenario #3. If the voltage drop is to be limited to 2.2%, this is ___ volts. -
(ANSWER)6.09
Refer to Figure 221.404. The voltage applied to Heating Element B is ___ volts. - (ANSWER)138.6
Refer to the nameplate and heater selection table, shown above in Figure 230.122. For a correctly sized
starter, the heater catalog number for the heaters is ___. This motor is supplied power from a 120/240-
volt, 3-phase, 4-wire panelboard. - (ANSWER)B32
Refer to the nameplate shown in Figure 230.122. The branch circuit for the motor is supplied from a
240/120-volt, 3Ø, 4-wire panelboard. What is the minimum size (3 wire + ground) SO cord that could be
used as a flexible connection for the motor? - (ANSWER)8
Refer to the nameplate shown in Figure 230.122. This motor should draw ___ amps at rated voltage
when connected to Circuit 4-6-8 that is fed from a 3-pole breaker in a 120/240-volt, 3Ø, 4-wire
panelboard. - (ANSWER)18.6
, IEC YEAR 2 FINAL EXAM QUESTIONS AND ANSWERS 2025
Two lighting circuits are supplied from a multiwire branch circuit that originates in a 120/240 volt, 1Ø, 3-
wire panelboard. Two, 20 Amp, 1-pole breakers are installed in spaces 22 & 24 for the multiwire circuit.
Circuit 22 has 2600 watts of lights connected to it, and Circuit 24 has 2100 watts of lights connected to
it. Which of the following should happen to Circuit 22? - (ANSWER)An overload will occur and the
breaker will trip.
Refer to Figure 221.402. If Ammeter 2 indicates 38.5 amps, the generator is delivering ___ kW of power.
- (ANSWER)16.0
The service disconnecting means for a 3-phase service is permitted to consist of ___. - (ANSWER)any of
the above
Nontime-delay fuses are to be installed in a safety switch adjacent to a motor. See Figure 230.225. Fuses
with a rating not exceeding ___ A are permitted. - (ANSWER)100
The classification of a location, where ignitable concentrations of flammable liquid-produced vapors or
combustible liquid-produced vapors exist under normal operating conditions, is ___. - (ANSWER)Class I,
Division 1
If a 4-wire, wye-connected supply system has a line-to-line voltage of 13.5 kV, what is the line-to-neutral
voltage? - (ANSWER)7,800
Refer to the motor nameplate shown in Figure 230.108. A NEMA starter will be used for this motor. The
fewest number of heaters that can be installed in the starter per the NEC ® is ___. The motor circuit is
supplied from a 2-pole breaker in a 120/240-volt, 3Ø, 4-W panel. - (ANSWER)1
A transformer has a primary rated voltage of 120 and a secondary rated voltage of 16. If the current in
the circuit conductors connected to the primary is 1.1 amps, the load that is connected to the secondary
must be drawing ___ amps. - (ANSWER)8.25
A set of wires (black, red, blue and green) are installed between a 3-pole safety switch and a 3Ø motor.
The direction of rotation of the motor can be changed by swapping the ___ wire connections on the
load side of the switch. - (ANSWER)black and blue
Refer to the information shown in Figure 234.151. When the tap for Motor 3 terminates in a safety
switch, the maximum permitted size for DETD fuses in this switch would be _____ A. - (ANSWER)15
Refer to the information shown in Figure 234.151. When the tap for Motor 1 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclosure would be ____ A. - (ANSWER)70
Refer to the information shown in Figure 234.151. When th etap for Motor 3 terminates in a breaker
enclosure, the maximum permitted size for an ITCB in this enclose would be ____ A. - (ANSWER)none of
these
Voltage Drop Scenario #3
The distance between the panel and a load is 150 feet. The circuit to the load consists of two 12 AWG
solid copper coated conductors that are connected to a 1-pole breaker in a 277/480-volt, 3Ø, 4-wire
panel and the neutral bar. The load draws 9.8 amps.
Refer to Voltage Drop Scenario #3. If the voltage drop is to be limited to 2.2%, this is ___ volts. -
(ANSWER)6.09
Refer to Figure 221.404. The voltage applied to Heating Element B is ___ volts. - (ANSWER)138.6
Refer to the nameplate and heater selection table, shown above in Figure 230.122. For a correctly sized
starter, the heater catalog number for the heaters is ___. This motor is supplied power from a 120/240-
volt, 3-phase, 4-wire panelboard. - (ANSWER)B32
Refer to the nameplate shown in Figure 230.122. The branch circuit for the motor is supplied from a
240/120-volt, 3Ø, 4-wire panelboard. What is the minimum size (3 wire + ground) SO cord that could be
used as a flexible connection for the motor? - (ANSWER)8
Refer to the nameplate shown in Figure 230.122. This motor should draw ___ amps at rated voltage
when connected to Circuit 4-6-8 that is fed from a 3-pole breaker in a 120/240-volt, 3Ø, 4-wire
panelboard. - (ANSWER)18.6
, IEC YEAR 2 FINAL EXAM QUESTIONS AND ANSWERS 2025
Two lighting circuits are supplied from a multiwire branch circuit that originates in a 120/240 volt, 1Ø, 3-
wire panelboard. Two, 20 Amp, 1-pole breakers are installed in spaces 22 & 24 for the multiwire circuit.
Circuit 22 has 2600 watts of lights connected to it, and Circuit 24 has 2100 watts of lights connected to
it. Which of the following should happen to Circuit 22? - (ANSWER)An overload will occur and the
breaker will trip.
Refer to Figure 221.402. If Ammeter 2 indicates 38.5 amps, the generator is delivering ___ kW of power.
- (ANSWER)16.0
The service disconnecting means for a 3-phase service is permitted to consist of ___. - (ANSWER)any of
the above
Nontime-delay fuses are to be installed in a safety switch adjacent to a motor. See Figure 230.225. Fuses
with a rating not exceeding ___ A are permitted. - (ANSWER)100
The classification of a location, where ignitable concentrations of flammable liquid-produced vapors or
combustible liquid-produced vapors exist under normal operating conditions, is ___. - (ANSWER)Class I,
Division 1
If a 4-wire, wye-connected supply system has a line-to-line voltage of 13.5 kV, what is the line-to-neutral
voltage? - (ANSWER)7,800
Refer to the motor nameplate shown in Figure 230.108. A NEMA starter will be used for this motor. The
fewest number of heaters that can be installed in the starter per the NEC ® is ___. The motor circuit is
supplied from a 2-pole breaker in a 120/240-volt, 3Ø, 4-W panel. - (ANSWER)1
A transformer has a primary rated voltage of 120 and a secondary rated voltage of 16. If the current in
the circuit conductors connected to the primary is 1.1 amps, the load that is connected to the secondary
must be drawing ___ amps. - (ANSWER)8.25
A set of wires (black, red, blue and green) are installed between a 3-pole safety switch and a 3Ø motor.
The direction of rotation of the motor can be changed by swapping the ___ wire connections on the
load side of the switch. - (ANSWER)black and blue
