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C-10 Test 1 Electrical Exam UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
Overhead service conductors OF NOT OVER 1000 VOLTS C: 8'6"
must maintain a minimum clearance of _ above the Above Roofs Overhead spans of open conductors and open multiconductor
surface of a roof: cables shall have a vertical clearance of not less than 2.7 m (8 ft 6 in.) above the
A: 3'5″ roof surface. The vertical clearance above the roof level shall be maintained for a
B. 4'4″ distance not less than 900 mm (3 ft) in all directions from the edge of the roof. ~
C. 8'6″ 3' refers to clearance at edge of roof.
D. 10'5″
Service conductors must have a clearance of not less A: 3'
than ___ from windows. Service conductors installed as open conductors or multiconductor cable without
an overall outer jacket shall have a clearance of not less than 900 mm (3 ft) from
A. 3′ windows that are designed to be opened, doors, porches, balconies, ladders,
B. 4′ stairs, fire escapes, or similar locations. (2022 California Electrical Code, 230.9(A))
C. 8′
D. 10′
An appliance on a 20-amp branch circuit should not draw C: 16 amps
more than: C. The maximum connected load for a 20-amp receptacle is 16 amps. All of the
appliances on a branch circuit cannot exceed 80% of the rating of the branch
A. 5 amps circuit. 20 amps × 0.8 = 16 amps (rating of branch circuit) × 0.8 = (the amps of all
B. 12 amps appliances on this circuit cannot exceed 16 amps)
C. 16 amps
D. 20 amps
,What is the minimum clear working space in front of a D: 48'
480 V panel opposite exposed live parts? The minimum clear working space for 0-150 V is 3 feet. The minimum clear working
space for 151-600 V is 4 feet.
A. 24″
B. 36″
C. 42″
D. 48″
The minimum size overhead service entrance cable A. No. 8 copper
permitted is: No. 8 copper. 2022 CEC 230.23(B) Minimum Size The conductors shall not be
smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum.
A. No. 8 copper Exception: Conductors supplying only limited loads of a single branch circuit —
B. No. 6 copper such as small polyphase power, controlled water heaters, and similar loads — shall
C. No. 4 aluminum not be smaller than 12 AWG hard-drawn copper or equivalent.
D. No. 2 copper-clad aluminum
A 50 kVA transformer supplies 480 V and 40 A. What is its A. 19kW
kW rating? kW [single phase] = (E x I)/1000 = (480 V x 40 A)/1000 = 19.2 kW. Note: Do not use
the square root of 3. This is only for 3 phase not single phase.
A. 19 kW
B. 40 kW
C. 68 kW
D. 77 kW
What is the minimum clear working space in front of a C. 42'
480 V panel opposite a grounded wall?
The minimum clear working space for 0-150V is 3 feet. The minimum clear working
A. 24″ space for 151-600V is 3 feet 6 inches.
B. 36″
C. 42″
D. 48″
The cable that has an internal bonding strip of copper or B. Type AC.
aluminum in contact with armor for its entire length is:
2022 CEC 320.1 Scope. This article covers the use, installation, and construction
A. MI specifications for armored cable, Type AC.
B. AC
C. NMC
D. RMC
The lead wire on a heating cable is red. This indicates: D. 208 volts refers to three phase power where two of the three legs are used to
power equipment. 240 volts refers to single phase power that is comprised of two
A. 120 V legs (both hot). The color red denotes a hot wire that carries electricity. Thus, red
B. 208 V is to be used for both three phase (208 volts) and single phase (240 volts). For 120
C. 240 V volts, a black OR RED conductor can be used; however, black is the default color.
D. either B or C Be aware that the NEC does NOT allow current carrying conductors to be white,
gray or green. This is the only color restriction.
, he following should not be used on a live circuit: B:
You cannot measure resistance with an ohmmeter on a "live" circuit! The reason for
A. voltmeter this is simple: the ohmmeter's accurate indication depends on the only source of
B. ohmmeter voltage being its internal battery.
C. ammeter
D. wattmeter
The minimum permitted size fixture wire is: C.
#14 is the smallest wire used in circuits. #18 is flexible wire.
A. No. 14
B. No. 16
C. No. 18
D. No. 20
The instrument that tests the resistance of wire insulation D.
is a(n): An ordinary ohmmeter cannot do an adequate job of checking the condition of
insulation subjected to high voltages. A Megger is also called an "insulation
A. ohmmeter tester".
B. voltmeter
C. galvanometer
D. Megger
The maximum voltage for a plug fuse is: B.
Plug fuses and fuseholders shall not be used in circuits exceeding 125 volts
A. 110 V between conductors except in circuits supplied from a system having a grounded
B. 125 V neutral and no conductor in such circuits operating at more than 150 volts to
C. 150 V ground.
D. 240 V
The device used to measure large values of alternating C. Current transformers are used extensively for measuring current and
current is a: monitoring the operation of the power grid. Along with voltage leads, revenue-
grade CTs drive the electrical utility's watt-hour meter on many larger commercial
and industrial supplies.
A. voltage transformer
B. wattmeter
C. current transformer
D. voltmeter
The total length of ground return path in FMT is limited A. 6 feet. 2022 CEC 250.118(5)(d) poses conditions to use a flexible metal conduit
to: as an equipment grounding conductor.
A. 6′
B. 12′
C. 18′
D. 24′
Pump motor rotation can be checked by using a(n): B. A phase rotation meter, also known as a phase sequence indicator, is a device
used to determine the phase sequence or phase order in a three-phase electrical
A. ammeter system. This is important for systems where phase sequence is critical, such as in
B. phase-directional meter the connection of motors.
C. voltmeter
D. ohmmeter
C-10 Test 1 Electrical Exam UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
Overhead service conductors OF NOT OVER 1000 VOLTS C: 8'6"
must maintain a minimum clearance of _ above the Above Roofs Overhead spans of open conductors and open multiconductor
surface of a roof: cables shall have a vertical clearance of not less than 2.7 m (8 ft 6 in.) above the
A: 3'5″ roof surface. The vertical clearance above the roof level shall be maintained for a
B. 4'4″ distance not less than 900 mm (3 ft) in all directions from the edge of the roof. ~
C. 8'6″ 3' refers to clearance at edge of roof.
D. 10'5″
Service conductors must have a clearance of not less A: 3'
than ___ from windows. Service conductors installed as open conductors or multiconductor cable without
an overall outer jacket shall have a clearance of not less than 900 mm (3 ft) from
A. 3′ windows that are designed to be opened, doors, porches, balconies, ladders,
B. 4′ stairs, fire escapes, or similar locations. (2022 California Electrical Code, 230.9(A))
C. 8′
D. 10′
An appliance on a 20-amp branch circuit should not draw C: 16 amps
more than: C. The maximum connected load for a 20-amp receptacle is 16 amps. All of the
appliances on a branch circuit cannot exceed 80% of the rating of the branch
A. 5 amps circuit. 20 amps × 0.8 = 16 amps (rating of branch circuit) × 0.8 = (the amps of all
B. 12 amps appliances on this circuit cannot exceed 16 amps)
C. 16 amps
D. 20 amps
,What is the minimum clear working space in front of a D: 48'
480 V panel opposite exposed live parts? The minimum clear working space for 0-150 V is 3 feet. The minimum clear working
space for 151-600 V is 4 feet.
A. 24″
B. 36″
C. 42″
D. 48″
The minimum size overhead service entrance cable A. No. 8 copper
permitted is: No. 8 copper. 2022 CEC 230.23(B) Minimum Size The conductors shall not be
smaller than 8 AWG copper or 6 AWG aluminum or copper-clad aluminum.
A. No. 8 copper Exception: Conductors supplying only limited loads of a single branch circuit —
B. No. 6 copper such as small polyphase power, controlled water heaters, and similar loads — shall
C. No. 4 aluminum not be smaller than 12 AWG hard-drawn copper or equivalent.
D. No. 2 copper-clad aluminum
A 50 kVA transformer supplies 480 V and 40 A. What is its A. 19kW
kW rating? kW [single phase] = (E x I)/1000 = (480 V x 40 A)/1000 = 19.2 kW. Note: Do not use
the square root of 3. This is only for 3 phase not single phase.
A. 19 kW
B. 40 kW
C. 68 kW
D. 77 kW
What is the minimum clear working space in front of a C. 42'
480 V panel opposite a grounded wall?
The minimum clear working space for 0-150V is 3 feet. The minimum clear working
A. 24″ space for 151-600V is 3 feet 6 inches.
B. 36″
C. 42″
D. 48″
The cable that has an internal bonding strip of copper or B. Type AC.
aluminum in contact with armor for its entire length is:
2022 CEC 320.1 Scope. This article covers the use, installation, and construction
A. MI specifications for armored cable, Type AC.
B. AC
C. NMC
D. RMC
The lead wire on a heating cable is red. This indicates: D. 208 volts refers to three phase power where two of the three legs are used to
power equipment. 240 volts refers to single phase power that is comprised of two
A. 120 V legs (both hot). The color red denotes a hot wire that carries electricity. Thus, red
B. 208 V is to be used for both three phase (208 volts) and single phase (240 volts). For 120
C. 240 V volts, a black OR RED conductor can be used; however, black is the default color.
D. either B or C Be aware that the NEC does NOT allow current carrying conductors to be white,
gray or green. This is the only color restriction.
, he following should not be used on a live circuit: B:
You cannot measure resistance with an ohmmeter on a "live" circuit! The reason for
A. voltmeter this is simple: the ohmmeter's accurate indication depends on the only source of
B. ohmmeter voltage being its internal battery.
C. ammeter
D. wattmeter
The minimum permitted size fixture wire is: C.
#14 is the smallest wire used in circuits. #18 is flexible wire.
A. No. 14
B. No. 16
C. No. 18
D. No. 20
The instrument that tests the resistance of wire insulation D.
is a(n): An ordinary ohmmeter cannot do an adequate job of checking the condition of
insulation subjected to high voltages. A Megger is also called an "insulation
A. ohmmeter tester".
B. voltmeter
C. galvanometer
D. Megger
The maximum voltage for a plug fuse is: B.
Plug fuses and fuseholders shall not be used in circuits exceeding 125 volts
A. 110 V between conductors except in circuits supplied from a system having a grounded
B. 125 V neutral and no conductor in such circuits operating at more than 150 volts to
C. 150 V ground.
D. 240 V
The device used to measure large values of alternating C. Current transformers are used extensively for measuring current and
current is a: monitoring the operation of the power grid. Along with voltage leads, revenue-
grade CTs drive the electrical utility's watt-hour meter on many larger commercial
and industrial supplies.
A. voltage transformer
B. wattmeter
C. current transformer
D. voltmeter
The total length of ground return path in FMT is limited A. 6 feet. 2022 CEC 250.118(5)(d) poses conditions to use a flexible metal conduit
to: as an equipment grounding conductor.
A. 6′
B. 12′
C. 18′
D. 24′
Pump motor rotation can be checked by using a(n): B. A phase rotation meter, also known as a phase sequence indicator, is a device
used to determine the phase sequence or phase order in a three-phase electrical
A. ammeter system. This is important for systems where phase sequence is critical, such as in
B. phase-directional meter the connection of motors.
C. voltmeter
D. ohmmeter
