ABYC CORROSION EXAM 2026 GALVANIC
AND ELECTROLYTIC CORROSION PRACTICE
SET ANSWERS FULL SOLUTION
◉ False. the battery charger case shall be tied to the engine negative
terminal/bus, along with the negative output terminal of the battery
charger, not at the battery charger case itself.,.
Answer: T or F: A battery charger case shall be tied to the DC
negative output terminal at the battery charger.
◉ In case of an internal short to the case, the AC grounding wire
would not carry enough current..
Answer: Why do battery chargers require a separate case
connection to main AC grounding bus and Engine negative / DC
grounding bus?
◉ No smaller than 1 size below the DC current carrying conductors
between the charger and batteries - provided OC protection on
positive DC output is no greater than 135% of DC grounding cable
ampacity and conductor is no smaller than 16 AWG..
Answer: What is the minimal wire size required for a battery
charger case connection to DC ground/engine negative?
◉ Class T fuse rated for appropriate AIC.
,Answer: What device is typically found to satisfy the required OC
protection between a battery charger and the batteries?
◉ Batteries will feed back into solar array or wind generator coil
and discharge (possibly damage). Note: many voltage regulators
have integral blocking diodes..
Answer: What may happen to a solar array or wind generator used
to charge batteries without a blocking diode?
◉ 24 inches or more (unless waterproof!).
Answer: How far above bilge water level must a battery charger be
mounted?
◉ At least 24 inches.
Answer: How far away from a gasoline tank must a pre-wired
battery charger's AC connection plug be located?
◉ False. (only when installed in location that required GFCI per
ABYC E-11).
Answer: T or F: All marine inverters shall utilize an internal or
external GFCI on their AC outlets.
◉ False. Most are not ignition protected..
,Answer: T or F: most GFCI outlets can be used in a gasoline engine
room
◉ False. Shore power neutral is tied to ground on the shore side..
Answer: T or F: Because the shore power connection is a power
source, the neutral conductor should be tied to ground at the point
where it comes in to the boat (shore power cable connection)
◉ Both..
Answer: Tech A says that voltage supplied to the rotor controls the
alternator output voltage. Tech B says that the alternator output is
proportional to the rotor voltage. Which is correct, A, B, Both or
Neither?
◉ Tech A.
Answer: Tech A says that AC and DC are able to run together down
the same conductor. Tech B says this is technically impossible. Which
is correct, A, B, neither or both?
◉ 10'.
Answer: According to ABYC, what is the maximum distance allowed
between a boat's shore power connection and the main overcurrent
protection device?
, ◉ Equipment Leakage Current Interrupter - within 10 feet of shore
power connection unless an isolation transformer is located within
10' of shore power connection..
Answer: What is an ELCI and where is it required to be installed?
◉ False, they must be isolated to prevent shock hazard at the
unutilizd shore power connector pins..
Answer: T or F: When more than one option for shore power inlet is
installed on a boat, the shore power neutrals shall be tied together
on the boat.
◉ At least 135% of isloator's nominal rating. (A-28.11.1).
Answer: What ampacity is required for wire and terminals
connecting a galvanic islolator?
◉ Ampacity < 20 Amps, voltage drop across terminals < 50 mV @ 20
A flow, no separation with a one-minute pull of 6 lb force..
Answer: What is the general rule for use of friction connectors?
◉ > 25 degrees above ambient.
Answer: When measuring temperature to determine potential
electrical issues involving excessive connector resistance, what is the
threshold for concern?
AND ELECTROLYTIC CORROSION PRACTICE
SET ANSWERS FULL SOLUTION
◉ False. the battery charger case shall be tied to the engine negative
terminal/bus, along with the negative output terminal of the battery
charger, not at the battery charger case itself.,.
Answer: T or F: A battery charger case shall be tied to the DC
negative output terminal at the battery charger.
◉ In case of an internal short to the case, the AC grounding wire
would not carry enough current..
Answer: Why do battery chargers require a separate case
connection to main AC grounding bus and Engine negative / DC
grounding bus?
◉ No smaller than 1 size below the DC current carrying conductors
between the charger and batteries - provided OC protection on
positive DC output is no greater than 135% of DC grounding cable
ampacity and conductor is no smaller than 16 AWG..
Answer: What is the minimal wire size required for a battery
charger case connection to DC ground/engine negative?
◉ Class T fuse rated for appropriate AIC.
,Answer: What device is typically found to satisfy the required OC
protection between a battery charger and the batteries?
◉ Batteries will feed back into solar array or wind generator coil
and discharge (possibly damage). Note: many voltage regulators
have integral blocking diodes..
Answer: What may happen to a solar array or wind generator used
to charge batteries without a blocking diode?
◉ 24 inches or more (unless waterproof!).
Answer: How far above bilge water level must a battery charger be
mounted?
◉ At least 24 inches.
Answer: How far away from a gasoline tank must a pre-wired
battery charger's AC connection plug be located?
◉ False. (only when installed in location that required GFCI per
ABYC E-11).
Answer: T or F: All marine inverters shall utilize an internal or
external GFCI on their AC outlets.
◉ False. Most are not ignition protected..
,Answer: T or F: most GFCI outlets can be used in a gasoline engine
room
◉ False. Shore power neutral is tied to ground on the shore side..
Answer: T or F: Because the shore power connection is a power
source, the neutral conductor should be tied to ground at the point
where it comes in to the boat (shore power cable connection)
◉ Both..
Answer: Tech A says that voltage supplied to the rotor controls the
alternator output voltage. Tech B says that the alternator output is
proportional to the rotor voltage. Which is correct, A, B, Both or
Neither?
◉ Tech A.
Answer: Tech A says that AC and DC are able to run together down
the same conductor. Tech B says this is technically impossible. Which
is correct, A, B, neither or both?
◉ 10'.
Answer: According to ABYC, what is the maximum distance allowed
between a boat's shore power connection and the main overcurrent
protection device?
, ◉ Equipment Leakage Current Interrupter - within 10 feet of shore
power connection unless an isolation transformer is located within
10' of shore power connection..
Answer: What is an ELCI and where is it required to be installed?
◉ False, they must be isolated to prevent shock hazard at the
unutilizd shore power connector pins..
Answer: T or F: When more than one option for shore power inlet is
installed on a boat, the shore power neutrals shall be tied together
on the boat.
◉ At least 135% of isloator's nominal rating. (A-28.11.1).
Answer: What ampacity is required for wire and terminals
connecting a galvanic islolator?
◉ Ampacity < 20 Amps, voltage drop across terminals < 50 mV @ 20
A flow, no separation with a one-minute pull of 6 lb force..
Answer: What is the general rule for use of friction connectors?
◉ > 25 degrees above ambient.
Answer: When measuring temperature to determine potential
electrical issues involving excessive connector resistance, what is the
threshold for concern?
