ABYC CORROSION EXAM 2026
CERTIFICATION EVALUATION EXAMS
COMPLETE QUESTIONS AND ANSWERS
◉ 800 CCA or 100 Ahr (exceptions: electronic equipment with
battery backed memories; safety equipment such as bilge pumps,
alarms, CO detectors, bilge blowers; battery chargers; I'm pressed
current systems..
Answer: Per ABYC E-10, a battery switch must be installed in the
positive conductor from each battery bank with a CCA rating greater
than ____ (or greater than _____ Ah if CCA rating not available).
◉ AIC = 5000 Amps (E-11 table IV-A).
Answer: What is the minimum ampere interrupting capacity (AIC)
for main overcurrent protection on a battery bank rated at 12 V,
1500 CCA?
◉ AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating..
Answer: What is the minimum ampere interrupting capacity (AIC)
for main overcurrent protection on a battery bank rated at more
than 2200 CCA or more than 500 Ahr?
,◉ False. "Readily accessible" defines entry into the engine room in
an emergency as dangerous - use a remote battery switch..
Answer: T or F: it is ok to mount a battery switch inside an engine
room, because ABYC startes that it must be located as close to the
batteries as practical.
◉ Overcurrent protection must be located withing 7 inches of the
power source unless contained within a sheath, in which case it may
be up to 40 inches away. If the power source is a battery and the
conductors are sheathed, OC may be up to 72 inches away..
Answer: Explain the "7-40-72" rule
◉ Resetting mechanism cannot overrid over current interrupting
mechanism. (Note: some residential breakers are not trip free).
Answer: What does "trip free" breaker mean?
◉ C. 14.1 V.
Answer: The maximum sustained charging voltage acceptable to
some gell cell battery manufacturers is:
A. 13.8 V
B. 14.5 V
C. 14.1 V
D. 13.2 Vll
,◉ 0.050 points of specific gravity below other cells = bad cell..
Answer: When testing a wet-cell battery with a hydrometer, what
threshold is used to determine a bad cell?
◉ 1.260 - 1.285 (temperature dependent).
Answer: When testing a wet-cell battery with a hydrometer, what
reading indicates a fully charged battery?
◉ 50%.
Answer: When testing a fully charged start battery for capacity with
a load tester, what % of CCA rating should be induced by the load to
test resulting voltage?
◉ C. Between 150% and 200%.
Answer: Most engine-driven alternators are optimally spun at what
percentage of engine RPMs?
A. Between 10% and 50%
B. Less than 10%
C. Between 150% and 200%
D. Greater than 200%
◉ 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?
CERTIFICATION EVALUATION EXAMS
COMPLETE QUESTIONS AND ANSWERS
◉ 800 CCA or 100 Ahr (exceptions: electronic equipment with
battery backed memories; safety equipment such as bilge pumps,
alarms, CO detectors, bilge blowers; battery chargers; I'm pressed
current systems..
Answer: Per ABYC E-10, a battery switch must be installed in the
positive conductor from each battery bank with a CCA rating greater
than ____ (or greater than _____ Ah if CCA rating not available).
◉ AIC = 5000 Amps (E-11 table IV-A).
Answer: What is the minimum ampere interrupting capacity (AIC)
for main overcurrent protection on a battery bank rated at 12 V,
1500 CCA?
◉ AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating..
Answer: What is the minimum ampere interrupting capacity (AIC)
for main overcurrent protection on a battery bank rated at more
than 2200 CCA or more than 500 Ahr?
,◉ False. "Readily accessible" defines entry into the engine room in
an emergency as dangerous - use a remote battery switch..
Answer: T or F: it is ok to mount a battery switch inside an engine
room, because ABYC startes that it must be located as close to the
batteries as practical.
◉ Overcurrent protection must be located withing 7 inches of the
power source unless contained within a sheath, in which case it may
be up to 40 inches away. If the power source is a battery and the
conductors are sheathed, OC may be up to 72 inches away..
Answer: Explain the "7-40-72" rule
◉ Resetting mechanism cannot overrid over current interrupting
mechanism. (Note: some residential breakers are not trip free).
Answer: What does "trip free" breaker mean?
◉ C. 14.1 V.
Answer: The maximum sustained charging voltage acceptable to
some gell cell battery manufacturers is:
A. 13.8 V
B. 14.5 V
C. 14.1 V
D. 13.2 Vll
,◉ 0.050 points of specific gravity below other cells = bad cell..
Answer: When testing a wet-cell battery with a hydrometer, what
threshold is used to determine a bad cell?
◉ 1.260 - 1.285 (temperature dependent).
Answer: When testing a wet-cell battery with a hydrometer, what
reading indicates a fully charged battery?
◉ 50%.
Answer: When testing a fully charged start battery for capacity with
a load tester, what % of CCA rating should be induced by the load to
test resulting voltage?
◉ C. Between 150% and 200%.
Answer: Most engine-driven alternators are optimally spun at what
percentage of engine RPMs?
A. Between 10% and 50%
B. Less than 10%
C. Between 150% and 200%
D. Greater than 200%
◉ 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?
