ABYC Marine Electrical Certification Exam Review Questions and Answers
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ABYC Marine Electrical Certification Exam Review Questions and Answers
Every 18 inches.
How often (in inches) shall wire bundles be supported?
Insulated Metallic Hanger Clamps
What type of clamps are to be used for supporting wire bundles when routed over engines and machinery?
40 ...
insulated metallic hanger clamps what type of clam
c unwanted open the most common electrical circui
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ABYC Marine Electrical Certification
Exam Review Questions and Answers
Every 18 inches. - answer How often (in inches) shall wire bundles be supported?
Insulated Metallic Hanger Clamps - answer What type of clamps are to be used for
supporting wire bundles when routed over engines and machinery?
40 lbs (E-11 Table XV) - answer What tensile force must a 10 Gauge crimp connector
withstand for one minute?
36 inches - answer What is the max allowed unsupported cable length for battery
cables?
True – answer T or F: Running AC and DC conductors together is allowed so long as
the AC conductors are sheathed.
C. Unwanted open - answer The most common electrical circuit problem in marine
applications is:
A. Short circuits
B. Too much continuity
C. Unwanted open
D. Inter circuit Short
D. Heat - answer The primary by-product of excessive electrical resistance is:
A. Increased Amperage
B. Increased Voltage
C. Reduced Ambient Temperature
D. Heat
1 HP = 746 Watts - answer One HP = how many watts?
D. TDR (time-domain reflectometer) - answer What is the preferred tool for tracing
shorted and open circuits?
A. Ohm meter
B. Amp clamp
C. Volt meter
D. TDR (time-domain reflectometer)
0 AWG - answer A technician is installing a cable run from the batteries to the main DC
panel board on a boat as part of a refit. The boat has a 12-volt system and the distance
,form the panel to the batteries is 15 ft. The maximum current draw from the panel is
calculated at 90 amps. What guage cable should be used (minimum)?
Yellow – answer DC grounded conductors on new boats that are also equipped with AC
systems should use what color insulated wire?
16 AWG - answerWhat is the smallest guage wire allowed for unsheathed wire runs
through the boat?
False. Start batteries have a greater number of thinner plates within each cell. -
answerT or F: Compared to deep cycle (house) batteries, cranking batteries will have
thicker lead plates to facilitate the higher, short-duration current draws.
Cranking - answerWhich type of battery generally recharges faster? Deep cycle or
cranking?
Wire brush and backing soda. - answerWhat tool and common household staple are
used to clean battery terminals?
Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in
the electrolyte. - answerWhy might a fully-discharged wet-cell type battery freeze?
1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction. - answerBatteries
must be secured to prevent movement of more than ______ inches in any direction
when a pulling force of _____ or _____, whichever is less, is applied through the center
of gravity of the battery for how long?
True - answerT or F: it is ok to install batteries directly below an uninterrupted fuel line?
Must be protected with dielectric insulating material - answerWhat provision must be in
place on any fuel line located within 12 inches of a battery terminals?
80 F, 25 Amps, 10.5 Volts - answerDefine: Battery reserve capacity = the number of
minutes that a new, fully charged battery at ______ degrees F can be continuously
discharged at ______ amps while maintaining _____ volts (for a 12 v battery)
90 minutes - answerAccording to ABYC, what is the minimum battery reserve capacity?
32 degrees F, 30 seconds, 7.2V - answerDefine: 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).
0 degrees F, 30 seconds, 7.2V - answerDefine: 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).
,8 AWG - answerWhat is the largest guage wire that may be connected to a bettery with
wing-nuts?
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. - answerPer 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) - answerWhat 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. - answerWhat 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. - answerT 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.
- answerExplain the "7-40-72" rule
Resetting mechanism cannot overrid over current interrupting mechanism. (Note: some
residential breakers are not trip free) - answerWhat does "trip free" breaker mean?
C. 14.1 V - answerThe 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. - answerWhen testing a wet-
cell battery with a hydrometer, what threshold is used to determine a bad cell?
1.260 - 1.285 (temperature dependent) - answerWhen testing a wet-cell battery with a
hydrometer, what reading indicates a fully charged battery?
50% - answerWhen 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% - answerMost 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., - answerT 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. - answerWhy 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. - answerWhat
is the minimal wire size required for a battery charger case connection to DC
ground/engine negative?
Class T fuse rated for appropriate AIC - answerWhat 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. - answerWhat
may happen to a solar array or wind generator used to charge batteries without a
blocking diode?
24 inches or more (unless waterproof!) - answerHow far above bilge water level must a
battery charger be mounted?
At least 24 inches - answerHow 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) - answerT or
F: All marine inverters shall utilize an internal or external GFCI on their AC outlets.
False. Most are not ignition protected. - answerT 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. - answerT 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)
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