IYRS ELECTRICAL ABYC Exam 2
Questions and Answers 100% Pass A+
Latest Versions 2025
Define: Marine Cranking Amps = the discharge load, in amperes, that a
new, fully-charged battery at degrees F can deliver for
seconds while maintaining a voltage of volts (for a 12 v battery). -
ANSWER✔✔-32 degrees F, 30 seconds, 7.2V
Define: Cold Cranking Amps = the discharge load, in amperes, that a new,
fully-charged battery at degrees F can deliver for seconds
while maintaining a voltage of volts (for a 12 v battery). -
ANSWER✔✔-0 degrees F, 30 seconds, 7.2V
What is the largest guage wire that may be connected to a bettery with
wing-nuts? - ANSWER✔✔-8 AWG
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). - ANSWER✔✔-800 CCA or 100
Ahr (exceptions: electronic equipment with battery backed memories;
,Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 5/92
,safety equipment such as bilge pumps, alarms, CO detectors, bilge blowers;
battery chargers; I'm pressed current systems.
What is the minimum ampere interrupting capacity (AIC) for main
overcurrent protection on a battery bank rated at 12 V, 1500 CCA? -
ANSWER✔✔-AIC = 5000 Amps (E-11 table IV-A)
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? - ANSWER✔✔-AIC = 2X mnfg's short-circuit rating or
100X nominal Ahr rating.
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. -
ANSWER✔✔-False. "Readily accessible" defines entry into the engine room
in an emergency as dangerous - use a remote battery switch.
Explain the "7-40-72" rule - ANSWER✔✔-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.
What does "trip free" breaker mean? - ANSWER✔✔-Resetting mechanism
cannot overrid over current interrupting mechanism. (Note: some
residential breakers are not trip free)
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 - ANSWER✔✔-C. 14.1 V
When testing a wet-cell battery with a hydrometer, what threshold is used
to determine a bad cell? - ANSWER✔✔-0.050 points of specific gravity
below other cells = bad cell.
Questions and Answers 100% Pass A+
Latest Versions 2025
Define: Marine Cranking Amps = the discharge load, in amperes, that a
new, fully-charged battery at degrees F can deliver for
seconds while maintaining a voltage of volts (for a 12 v battery). -
ANSWER✔✔-32 degrees F, 30 seconds, 7.2V
Define: Cold Cranking Amps = the discharge load, in amperes, that a new,
fully-charged battery at degrees F can deliver for seconds
while maintaining a voltage of volts (for a 12 v battery). -
ANSWER✔✔-0 degrees F, 30 seconds, 7.2V
What is the largest guage wire that may be connected to a bettery with
wing-nuts? - ANSWER✔✔-8 AWG
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). - ANSWER✔✔-800 CCA or 100
Ahr (exceptions: electronic equipment with battery backed memories;
,Copyright ©EMILLYCHARLOTE 2025 ACADEMIC YEAR, ALL RIGHTS RESERVED. Page 5/92
,safety equipment such as bilge pumps, alarms, CO detectors, bilge blowers;
battery chargers; I'm pressed current systems.
What is the minimum ampere interrupting capacity (AIC) for main
overcurrent protection on a battery bank rated at 12 V, 1500 CCA? -
ANSWER✔✔-AIC = 5000 Amps (E-11 table IV-A)
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? - ANSWER✔✔-AIC = 2X mnfg's short-circuit rating or
100X nominal Ahr rating.
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. -
ANSWER✔✔-False. "Readily accessible" defines entry into the engine room
in an emergency as dangerous - use a remote battery switch.
Explain the "7-40-72" rule - ANSWER✔✔-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.
What does "trip free" breaker mean? - ANSWER✔✔-Resetting mechanism
cannot overrid over current interrupting mechanism. (Note: some
residential breakers are not trip free)
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 - ANSWER✔✔-C. 14.1 V
When testing a wet-cell battery with a hydrometer, what threshold is used
to determine a bad cell? - ANSWER✔✔-0.050 points of specific gravity
below other cells = bad cell.
