ABYC MARINE ELECTRICAL
CERTIFICATION EXAM REVIEW
The customer reports that the generator will not crank from either the local or
remote control panel. Which of the following are likely causes?
a. low battery voltage
b. bad starter solenoid
c. faulty start switch on the remote panel
d. All of the above are likely causes - ANSWERS-d. All of the above are likely
causes
Technician A says generator output loads should be balanced between legs.
Technician B says as long as total output load is
below the maximum rated output no balance requirement exists. Which
response is correct?
a. Technician A
b. Technician B
c. Neither A nor B
d. Both A and B - ANSWERS-a. Technician A
ABYC requires self-limiting generators to have external over current
protection...
a) To match maximum rated output
b) At 120% of maximum rated output
,c) Not at all.
d) If its maximum overload current exceeds 120% of its rated output. -
ANSWERS-d) If its maximum overload current exceeds 120% of its rated output.
(see 11.6.2.3.2, exception)
Under certain circumstances, ABYC requires that a metallic shorepower Inlet
receptacle be insulated from the hull. When is that required?
a. When an isolation transformer is used
b. When no reverse polarity light is provided
c. When the boat is not bonded
d. When a galvanic isolator is installed
e. Both a and d - ANSWERS-e. Both a and d
T or F: The "L" shaped prong on a 20 amp shore power cord is the black or
"hot" wire. - ANSWERS-False - the "L" shaped prong is Ground
A galvanic isolator will be connected with conductors having an ampacity that
is _____ of the isolator's rating.
a. 120%
b. 125%
c. 135%
d. 150% - ANSWERS-c. 135% (see A-28.11.1)
An isolation transformer shall have overcurrent protection rated at not more
than _____ of the rated primary of the transformer.
a. 100%
b. 125%
,c. 135%
d. 150% - ANSWERS-b. 125% (see E-11.10.2.5.1.1)
lf fuses are used in addition to the main shore power disconnect circuit
breaker, their rating shall be such that the circuit breakers trip before the fuses
open the circuit, in the event of overload. The ampere rating of the additional
fuses shall not be greater than ________ percent of the rating of the main
shore power disconnect circuit breaker.
a. 100%
b. 120%
c. 125%
d. 135% - ANSWERS-c. 125% (see E-11.10.2.8.3.1)
If a customer complains of low voltage at the AC Panel while at the dock, the
technician should first
a. recalibrate the panel meter
b. check shore power connections
c. check polarity indictor
d. replace the overcurrent protection device - ANSWERS-b. check shore power
connections
Technician A says overcurrent protection for the main shore power feeders
must be with 7" of the source of power (the hull
inlet connector) or 40" if the wires are sheathed or otherwise protected.
Technician B says the main shore power disconnect
breaker must be within 10' of the inlet to the boat. Which is correct?
a. Technician A
, b. Technician B
c. Neither A nor B are correct
d. Depending on other conditions, both may be correct. - ANSWERS-b.
Technician B
AC grounding conductors connect metallic non-current carrying parts of the
electrical equipment to which other part?
a. the AC grounding system onboard the boat
b. the engine negative terminal, or its bus
c. the shore AC grounding conductor through the shore power cord
d. all of the above - ANSWERS-d. all of the above
The neutral for AC power sources shall be grounded at which point?
a. through the shore power cable and shall not be grounded on board the boat.
b. Generator neutral shall be grounded at the generator
c. Inverter neutral shall be grounded at the inverter when inverter is producing
AC power.
d. All of the above - ANSWERS-d. All of the above
When more than one shore power inlet is installed, ABYC recommends that the
neutrals are
a. not connected together
b. connected together
c. connected to AC grounding bus
d. connected to DC grounding bus - ANSWERS-a. not connected together
CERTIFICATION EXAM REVIEW
The customer reports that the generator will not crank from either the local or
remote control panel. Which of the following are likely causes?
a. low battery voltage
b. bad starter solenoid
c. faulty start switch on the remote panel
d. All of the above are likely causes - ANSWERS-d. All of the above are likely
causes
Technician A says generator output loads should be balanced between legs.
Technician B says as long as total output load is
below the maximum rated output no balance requirement exists. Which
response is correct?
a. Technician A
b. Technician B
c. Neither A nor B
d. Both A and B - ANSWERS-a. Technician A
ABYC requires self-limiting generators to have external over current
protection...
a) To match maximum rated output
b) At 120% of maximum rated output
,c) Not at all.
d) If its maximum overload current exceeds 120% of its rated output. -
ANSWERS-d) If its maximum overload current exceeds 120% of its rated output.
(see 11.6.2.3.2, exception)
Under certain circumstances, ABYC requires that a metallic shorepower Inlet
receptacle be insulated from the hull. When is that required?
a. When an isolation transformer is used
b. When no reverse polarity light is provided
c. When the boat is not bonded
d. When a galvanic isolator is installed
e. Both a and d - ANSWERS-e. Both a and d
T or F: The "L" shaped prong on a 20 amp shore power cord is the black or
"hot" wire. - ANSWERS-False - the "L" shaped prong is Ground
A galvanic isolator will be connected with conductors having an ampacity that
is _____ of the isolator's rating.
a. 120%
b. 125%
c. 135%
d. 150% - ANSWERS-c. 135% (see A-28.11.1)
An isolation transformer shall have overcurrent protection rated at not more
than _____ of the rated primary of the transformer.
a. 100%
b. 125%
,c. 135%
d. 150% - ANSWERS-b. 125% (see E-11.10.2.5.1.1)
lf fuses are used in addition to the main shore power disconnect circuit
breaker, their rating shall be such that the circuit breakers trip before the fuses
open the circuit, in the event of overload. The ampere rating of the additional
fuses shall not be greater than ________ percent of the rating of the main
shore power disconnect circuit breaker.
a. 100%
b. 120%
c. 125%
d. 135% - ANSWERS-c. 125% (see E-11.10.2.8.3.1)
If a customer complains of low voltage at the AC Panel while at the dock, the
technician should first
a. recalibrate the panel meter
b. check shore power connections
c. check polarity indictor
d. replace the overcurrent protection device - ANSWERS-b. check shore power
connections
Technician A says overcurrent protection for the main shore power feeders
must be with 7" of the source of power (the hull
inlet connector) or 40" if the wires are sheathed or otherwise protected.
Technician B says the main shore power disconnect
breaker must be within 10' of the inlet to the boat. Which is correct?
a. Technician A
, b. Technician B
c. Neither A nor B are correct
d. Depending on other conditions, both may be correct. - ANSWERS-b.
Technician B
AC grounding conductors connect metallic non-current carrying parts of the
electrical equipment to which other part?
a. the AC grounding system onboard the boat
b. the engine negative terminal, or its bus
c. the shore AC grounding conductor through the shore power cord
d. all of the above - ANSWERS-d. all of the above
The neutral for AC power sources shall be grounded at which point?
a. through the shore power cable and shall not be grounded on board the boat.
b. Generator neutral shall be grounded at the generator
c. Inverter neutral shall be grounded at the inverter when inverter is producing
AC power.
d. All of the above - ANSWERS-d. All of the above
When more than one shore power inlet is installed, ABYC recommends that the
neutrals are
a. not connected together
b. connected together
c. connected to AC grounding bus
d. connected to DC grounding bus - ANSWERS-a. not connected together
