ABYC ELECTRICAL EXAM 2026 STUDY
GUIDE QUESTION SET WIRING SYSTEMS
INSIGHT MATERIAL
◉ 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
b . Tech B
c. Both are right.
, d. Neither are right.
◉ d. 35.7 amps
Answer: According to ABYC, maximum current carrying capacity of a
10 gauge wire, 105 degree C insulation, inside the engine room
when bundled with 2 other current carrying wires would be?
a. 60 amps
b. 51 amps
c. 42 amps
d. 35.7 amps
◉ c. It should read '0' VDC
Answer: What is the expected voltage across a 'closed' switch that is
operating properly
a. It should read current battery voltage
b. It can be up to 10% less than battery voltage
c. It should read '0' VDC
d. Not enough information provided
◉ d. 72"
Answer: Sheathed ungrounded conductors connected directly to a
battery must have overcurrent protection devices located within
GUIDE QUESTION SET WIRING SYSTEMS
INSIGHT MATERIAL
◉ 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
b . Tech B
c. Both are right.
, d. Neither are right.
◉ d. 35.7 amps
Answer: According to ABYC, maximum current carrying capacity of a
10 gauge wire, 105 degree C insulation, inside the engine room
when bundled with 2 other current carrying wires would be?
a. 60 amps
b. 51 amps
c. 42 amps
d. 35.7 amps
◉ c. It should read '0' VDC
Answer: What is the expected voltage across a 'closed' switch that is
operating properly
a. It should read current battery voltage
b. It can be up to 10% less than battery voltage
c. It should read '0' VDC
d. Not enough information provided
◉ d. 72"
Answer: Sheathed ungrounded conductors connected directly to a
battery must have overcurrent protection devices located within
