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ABYC Marine Electrical Certification Exam Review.
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ABYC Marine Electrical Certification Exam Review.
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ABYC Marine Electrical Certification Exam Review> 25 degrees above ambient - ANS-When measuring temperature to determine potential
electrical issues involving excessive connector resistance, what is the threshold for concern?
0 AWG - ANS-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)?
0 degrees F, 30 seconds, 7.2V - ANS-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).
0.050 points of specific gravity below other cells = bad cell. - ANS-When testing a wet-cell
battery with a hydrometer, what threshold is used to determine a bad cell?
1 HP = 746 Watts - ANS-One HP = how many watts?
1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction. - ANS-Batteries 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?
1 sq. ft. - ANS-What is the minimal required surface area for lightning protection system's
immersed ground plate?
1.260 - 1.285 (temperature dependent) - ANS-When testing a wet-cell battery with a
hydrometer, what reading indicates a fully charged battery?
10' - ANS-According to ABYC, what is the maximum distance allowed between a boat's shore
power connection and the main overcurrent protection device?
11.4 Amp current draw, use 15 Amp breaker - ANS-You are installing a 220 volt electric heater
in a boat. The heater is rated at 2500 watts. How many amps will it draw? What size circuit
breaker would you use?
1500 Watts / 20 A circuit (E-11.8.2.2.1.2) - ANS-When calculating AC loads for small galley
appliances, how many watts should be used for each 20 amp circuit?
16 AWG - ANS-What is the smallest guage wire allowed for unsheathed wire runs through the
boat?
,2 Watts / sq. ft. (E-11.8.2.2.1.1) - ANS-When calculating AC loads, what is the recommended
wattage per square foot of living area?
2-3% - ANS-What is the max typically allowable % difference between true sinusoidal peak AC
voltage and harmonically distorted peak AC voltage?
24 inches (E-11.14.1.3.7.1) - ANS-When multiple DC conductors are bundled together for a
distance of greater than ____ inches, the allowable ampacity of each conductor must be
derated based on the table found within standard E-11
24 inches or more (unless waterproof!) - ANS-How far above bilge water level must a battery
charger be mounted?
30 mA, 100 ms - ANS-What is the maximum allowable trip current & time for ELCI/RCD at the
main shore power input?
32 degrees F, 30 seconds, 7.2V - ANS-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).
36 inches - ANS-What is the max allowed unsupported cable length for battery cables?
4 AWG - ANS-What gauge wire is required at a minimum for the primary down conductor from a
lightning Air Terminal?
40 lbs (E-11 Table XV) - ANS-What tensile force must a 10 Gauge crimp connector withstand for
one minute?
50 VDC (E-11.14.1.2.1) - ANS-What is the minimum voltage rating for all DC conductors?
50% - ANS-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?
6 AWG - ANS-What gauge wires is required for lightning protection system secondary
conductors?
6 lbs for 1 minute (E-11.13.2.3) - ANS-What is the pull-test requirement for DC
plug/receptacles?
600 Watts for 15-amp circuit, 1000 Watts for 20-amp circuit (E-11.13.3.4) - ANS-For a branch
circuit supplying both receptacle loads and permanently connected loads, what is the maximum
recommended permanent load for 15-amp circuit? For 20-amp circuit?
,75 C (167 F) (E-11.14.1.1.3) - ANS-What is the minimum insulation temperature rating for
conductors routed inside an engine room?
8 AWG - ANS-What is the largest guage wire that may be connected to a bettery with
wing-nuts?
80 F, 25 Amps, 10.5 Volts - ANS-Define: 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)
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. - ANS-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).
90 minutes - ANS-According to ABYC, what is the minimum battery reserve capacity?
a. 10' - ANS-According to ABYC Standard E-11, the distance from the shore power inlet to the
main circuit over current protection should be within
a. 10'
b. 12'
c. 7"
d. 72"
a. 100% (see E-11.10.1.5.4) - ANS-A panelboard or switchboard with no sub-main circuit
breaker or fuse shall have installed, at the source of power, overcurrent protection not to exceed
_______ of the load capacity of that panel, or the current carrying capacity of the feeders.
a. 100%
b. 120%
c. 135%
d. 150%
a. 120 volts AC - ANS-What is the expected voltage when measured between Hot and Neutral
for a 120 Volt AC circuit?
a. 120 volts AC
b. 120 Volts DC
c. 0 Volts AC
d. None of the Above
a. 15 - ANS-The minimum amp circuit breaker that should be used to protect a 120VAC water
heater with a 1600 watt element would be rated at ________ amps.
a. 15
b. 10
, c. 30
d. 20
a. 15 amps - ANS-How much current should flow through the DC grounded conductor in a 15
amp DC lighting circuit?
a. 15 amps
b. 0 amps
c. 10 amps
d. None of the above
a. 35.7 amps - ANS-According to ABYC, maximum current carrying capacity of a 10 gauge wire,
105 degree C insulation, inside the engine room when bundled with 2 other current carrying
wires would be?
a. 35.7 amps
b. 60 amps
c. 5I amps
d. 42 amps
a. 5 mA - ANS-The nominal trip rate for GFCI receptacles in the US is:
a. 5 mA
b. 10 mA
c. 15 mA
d. 30 mA
a. 89 amps - ANS-A 2000 watt inverter is operating at 50% capacity with a 90% effeciency
rating. With a battery voltage of 12.6 volts how many amps is the inverter drawing from the
battery bank?
a. 89 amps
b. 99 amps
c. 109 amps
d. 119 amps
a. ABYC A-20 Battery Charging Devices - ANS-1f an inverter also serves as a battery charger it
shall also meet the requirements of:
a. ABYC A-20 Battery Charging Devices
b. ABYC E-6 Refrigeration Equipment installation
c. A-16 Electric Navigational lighting
d. All of the above
a. AC induction motors - ANS-Which AC equipment should not run & will be damaged from a
'square' or 'modified' wave inverter
a. AC induction motors
b. Flatscreen T V
c. Printers
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