ABYC ELECTRICAL CORE EXAMINATION 2026
QUESTIONS AND ANSWERS SURE A+
✔✔What is a likely cause of a reverse polarity problem? - ✔✔Improperly wired shore
power cord, shore power inlet receptacle, or reversal of hot and neutral conductors.
✔✔What could cause a loss of galvanic isolation in a galvanic isolator installation? -
✔✔A shorted isolator diode, improper current rating, or an onboard neutral-to-ground
connection.
✔✔When must the generator's neutral and ground be tied together? - ✔✔When the
generator is supplying AC power.
✔✔What will a dropped neutral conductor in a 240/120 V shore power system most
likely show up as? - ✔✔Burned out 120 V appliances.
✔✔What could cause an overheated electrical connection? - ✔✔Loose terminal
connection, corroded connection, or undersized conductor for the load demand.
✔✔What is the most probable cause if a generator starts from the local control panel
but not from the remote control panel? - ✔✔Excessive voltage drop across the remote
starter switch.
✔✔What is likely the cause of low frequency output on a generator? - ✔✔Low engine
speed.
✔✔What tool is used for testing AC generator winding insulation integrity? -
✔✔Megohmmeter.
✔✔What could cause low AC voltage output under load on a brushless generator? -
✔✔Faulty exciter winding diode rectifier.
, ✔✔Who has a pull test requirement for wiring connecting the generator to onboard
circuits? - ✔✔ABYC.
✔✔What is required to accurately check output voltage from a non-sinusoidal inverter? -
✔✔A True RMS Volt Meter
✔✔Which ABYC standard applies to inverters? - ✔✔A-31
✔✔What type of voltmeter is required at the panel if the boat is equipped with an
inverter? - ✔✔An AC Voltmeter
✔✔What could cause a conductor to overheat except for which option? - ✔✔Insulation
Temperature Rating Too Low
✔✔When multiple conductors are bundled for a distance greater than how many inches
must the allowable ampacity of each conductor be derated? - ✔✔24 inches
✔✔What is the minimum battery reserve capacity in hours or minutes for supplied
battery power based on ABYC? - ✔✔90 minutes
✔✔Which technician is correct regarding faulty breakers requiring replacement? -
✔✔Tech B
✔✔What is the maximum allowable voltage drop permitted for panel board DC feeders
based on ABYC? - ✔✔3%
✔✔What test may a technician run to test a 120V AC element in a water heater? -
✔✔Continuity test
✔✔Where must all terminations for AC conductors be installed based on ABYC? -
✔✔Inside an enclosure requiring the use of hand tools to open
✔✔What is the best tool for locating shorts within a circuit based on the study guide? -
✔✔TDR
✔✔High frequency transformers typically run cooler or hotter than traditional magnetic
transformers? - ✔✔Cooler
✔✔Under what condition may AC receptacles be used for DC service based on ABYC?
- ✔✔They must never be used for DC service
QUESTIONS AND ANSWERS SURE A+
✔✔What is a likely cause of a reverse polarity problem? - ✔✔Improperly wired shore
power cord, shore power inlet receptacle, or reversal of hot and neutral conductors.
✔✔What could cause a loss of galvanic isolation in a galvanic isolator installation? -
✔✔A shorted isolator diode, improper current rating, or an onboard neutral-to-ground
connection.
✔✔When must the generator's neutral and ground be tied together? - ✔✔When the
generator is supplying AC power.
✔✔What will a dropped neutral conductor in a 240/120 V shore power system most
likely show up as? - ✔✔Burned out 120 V appliances.
✔✔What could cause an overheated electrical connection? - ✔✔Loose terminal
connection, corroded connection, or undersized conductor for the load demand.
✔✔What is the most probable cause if a generator starts from the local control panel
but not from the remote control panel? - ✔✔Excessive voltage drop across the remote
starter switch.
✔✔What is likely the cause of low frequency output on a generator? - ✔✔Low engine
speed.
✔✔What tool is used for testing AC generator winding insulation integrity? -
✔✔Megohmmeter.
✔✔What could cause low AC voltage output under load on a brushless generator? -
✔✔Faulty exciter winding diode rectifier.
, ✔✔Who has a pull test requirement for wiring connecting the generator to onboard
circuits? - ✔✔ABYC.
✔✔What is required to accurately check output voltage from a non-sinusoidal inverter? -
✔✔A True RMS Volt Meter
✔✔Which ABYC standard applies to inverters? - ✔✔A-31
✔✔What type of voltmeter is required at the panel if the boat is equipped with an
inverter? - ✔✔An AC Voltmeter
✔✔What could cause a conductor to overheat except for which option? - ✔✔Insulation
Temperature Rating Too Low
✔✔When multiple conductors are bundled for a distance greater than how many inches
must the allowable ampacity of each conductor be derated? - ✔✔24 inches
✔✔What is the minimum battery reserve capacity in hours or minutes for supplied
battery power based on ABYC? - ✔✔90 minutes
✔✔Which technician is correct regarding faulty breakers requiring replacement? -
✔✔Tech B
✔✔What is the maximum allowable voltage drop permitted for panel board DC feeders
based on ABYC? - ✔✔3%
✔✔What test may a technician run to test a 120V AC element in a water heater? -
✔✔Continuity test
✔✔Where must all terminations for AC conductors be installed based on ABYC? -
✔✔Inside an enclosure requiring the use of hand tools to open
✔✔What is the best tool for locating shorts within a circuit based on the study guide? -
✔✔TDR
✔✔High frequency transformers typically run cooler or hotter than traditional magnetic
transformers? - ✔✔Cooler
✔✔Under what condition may AC receptacles be used for DC service based on ABYC?
- ✔✔They must never be used for DC service
