ABYC MARINE ELECTRICAL CERTIFICATION
TEST PAPER 2026 FULL SOLUTION VERIFIED
◉ On diesels, the oil pressure sender may be used to switch
alternator on/off and the trigger the tachometer. Answer: Describe
why a non-functional tachometer and charging system on a diesel
engine may be caused by a failed oil pressure sending unit.
◉ False. Answer: True or False: AC receptacles may be used for DC
service, provided they are properly labeled.
◉ B. Tech B. Answer: Tech A says that combined AC/DC panel boards
are grounded via the DC negative bus. Tech B says that such panel
boards should be grounded to the AC grounding bus. Which tech is
right?
A. Tech A
B. Tech B
C. Both techs are correct
D. Neither tech is correct
◉ Closed when in neutral (therefore, an open-circuit failure would
prevent engine starting). Answer: Start-in-gear protection switches
should be open or closed when in neutral?
,◉ Styrene from curing fiberglass, methane from head/holding tank,
hydrogen from battery outgassing or refrigeration leaks. Answer:
Name three common gasses other than CO that may trigger a CO
alarm:
◉ Excessive humidity, low supply voltage. Answer: Name two likely
possible causes of falsely trigger fire alarm in an engine room space.
◉ True. Answer: T or F: boats with an enclosed accommodation
compartment shall have an audible high bilge-water alarm.
◉ 4 AWG. Answer: What gauge wire is required at a minimum for
the primary down conductor from a lightning Air Terminal?
◉ 1 sq. ft.. Answer: What is the minimal required surface area for
lightning protection system's immersed ground plate?
◉ 6 AWG. Answer: What gauge wires is required for lightning
protection system secondary conductors?
◉ 30 mA, 100 ms. Answer: What is the maximum allowable trip
current & time for ELCI/RCD at the main shore power input?
,◉ False. Answer: T or F: CO detectors will also detect smoke in most
situations.
◉ Peak Voltage = 1.414 * RMS Voltage
or, V peak * .707 = V RMS. Answer: For true RMS inverters what is
the relationship between peak and RMS voltage?
◉ 2-3%. Answer: What is the max typically allowable % difference
between true sinusoidal peak AC voltage and harmonically distorted
peak AC voltage?
◉ shorter, thicker terminal is HOT
taller, narrower terminal is NEUTRAL. Answer: On a standard 3-
conductor AC outlet, which of the two blade conductors (i.e., not the
rounded GROUNDING conductor) is Hot and which is Neutral?
◉ A. An open circuit in the neutral to ground link at an AC generator.
Answer: A polarity indicator light that is glowing more dimly than
normal could be an indicator of:
A. An open circuit in the neutral to ground link at an AC generator
B. An open circuit in the hot wire connection
C. A ground connection with very low impedance
D. Excessive AC frequency
, ◉ D. A neutral-to-gound link at the boats AC panel board. Answer:
When using a high-resolution amp clamp on a shore power cord and
activating AC circuits one by one, the technician notes that the AC
leakage current measured increases with each appliance. This most
likely indicates:
A. An open-circuit in the grounding conductor on the dock
B. Excessively high voltage delivered by the utility company
C. Excessive voltage drops in the AC power supply to the boat
D. A neutral-to-gound link at the boats AC panel board
◉ E. All of the above. Answer: A system voltmeter shall be installed
on the main panel board if the system is permanently connected to:
A. Inverter
B. Generator
C. Motor
D. B & C above
E. All of the above
◉ d. Neither are right.. Answer: Two techs are rewiring an old
sailboat. Tech A says they should use all series circuits to keep the
wiring clean and simple. Tech B
says series circuits should only serve a single load. Who is correct?
a . Tech A
TEST PAPER 2026 FULL SOLUTION VERIFIED
◉ On diesels, the oil pressure sender may be used to switch
alternator on/off and the trigger the tachometer. Answer: Describe
why a non-functional tachometer and charging system on a diesel
engine may be caused by a failed oil pressure sending unit.
◉ False. Answer: True or False: AC receptacles may be used for DC
service, provided they are properly labeled.
◉ B. Tech B. Answer: Tech A says that combined AC/DC panel boards
are grounded via the DC negative bus. Tech B says that such panel
boards should be grounded to the AC grounding bus. Which tech is
right?
A. Tech A
B. Tech B
C. Both techs are correct
D. Neither tech is correct
◉ Closed when in neutral (therefore, an open-circuit failure would
prevent engine starting). Answer: Start-in-gear protection switches
should be open or closed when in neutral?
,◉ Styrene from curing fiberglass, methane from head/holding tank,
hydrogen from battery outgassing or refrigeration leaks. Answer:
Name three common gasses other than CO that may trigger a CO
alarm:
◉ Excessive humidity, low supply voltage. Answer: Name two likely
possible causes of falsely trigger fire alarm in an engine room space.
◉ True. Answer: T or F: boats with an enclosed accommodation
compartment shall have an audible high bilge-water alarm.
◉ 4 AWG. Answer: What gauge wire is required at a minimum for
the primary down conductor from a lightning Air Terminal?
◉ 1 sq. ft.. Answer: What is the minimal required surface area for
lightning protection system's immersed ground plate?
◉ 6 AWG. Answer: What gauge wires is required for lightning
protection system secondary conductors?
◉ 30 mA, 100 ms. Answer: What is the maximum allowable trip
current & time for ELCI/RCD at the main shore power input?
,◉ False. Answer: T or F: CO detectors will also detect smoke in most
situations.
◉ Peak Voltage = 1.414 * RMS Voltage
or, V peak * .707 = V RMS. Answer: For true RMS inverters what is
the relationship between peak and RMS voltage?
◉ 2-3%. Answer: What is the max typically allowable % difference
between true sinusoidal peak AC voltage and harmonically distorted
peak AC voltage?
◉ shorter, thicker terminal is HOT
taller, narrower terminal is NEUTRAL. Answer: On a standard 3-
conductor AC outlet, which of the two blade conductors (i.e., not the
rounded GROUNDING conductor) is Hot and which is Neutral?
◉ A. An open circuit in the neutral to ground link at an AC generator.
Answer: A polarity indicator light that is glowing more dimly than
normal could be an indicator of:
A. An open circuit in the neutral to ground link at an AC generator
B. An open circuit in the hot wire connection
C. A ground connection with very low impedance
D. Excessive AC frequency
, ◉ D. A neutral-to-gound link at the boats AC panel board. Answer:
When using a high-resolution amp clamp on a shore power cord and
activating AC circuits one by one, the technician notes that the AC
leakage current measured increases with each appliance. This most
likely indicates:
A. An open-circuit in the grounding conductor on the dock
B. Excessively high voltage delivered by the utility company
C. Excessive voltage drops in the AC power supply to the boat
D. A neutral-to-gound link at the boats AC panel board
◉ E. All of the above. Answer: A system voltmeter shall be installed
on the main panel board if the system is permanently connected to:
A. Inverter
B. Generator
C. Motor
D. B & C above
E. All of the above
◉ d. Neither are right.. Answer: Two techs are rewiring an old
sailboat. Tech A says they should use all series circuits to keep the
wiring clean and simple. Tech B
says series circuits should only serve a single load. Who is correct?
a . Tech A
