1.
Which of the following would be a non-current carrying conductor in an AC electrical
system?
a.
b.
c.
d.
2.
A current carrying conductor that is connected to the side of the power source which is
intentionally maintained at ground potential is a:
a.
b.
c.
d.
3.
Grounding conductor
Ground
Neutral conductor
Galvanic isolator
An isolation transformer will:
a.
b.
c.
d.
4.
The White wire
The Green wire
The Red wire
The Black wire
Remove the need for a galvanic isolator and a reverse polarity indicator.
Be considered a source of power for AC.
Be rated to be equal to the shore power supply.
All the above are true.
An ungrounded conductor of a branch circuit is to be provided with overcurrent protection at
the point of connection to the main switchboard. The circuit breaker or fuse that is used for
this purpose is rated:
a.
b.
c.
d.
Not to exceed the maximum current carrying capacity of the conductor between
the fuse or circuit breaker and the load
At least for the nominal voltage of the supply circuit
To 150% of the conductor ampacity if no standard circuit breaker is available for
100%
All the above
1
5.
The AC grounding conductor should:
a.
b.
c.
d.
6.
The shore power cable must be:
a.
b.
c.
d.
7.
To turn-off the shore power connection correctly
To establish reverse polarity
As a reminder to disconnect the cable prior to getting underway
To minimize fire and shock hazards
Electrical conductors are marked with:
a.
b.
c.
d.
9.
Provided by the boat manufacturer
A non-locking flexible cord
Installed with a Galvanic Isolator
Equipped with a male end connector at the boat
The reason for posting a shore-power inlet warning sign is:
a.
b.
c.
d.
8.
be connected to AC neutral at the source
be connected to the AC grounded conductor at the inverter output when
in invert mode, generator output, and at the secondary of an isolation
transformer
be connected to the engine negative terminal or its bus
all the above
Type of conductor, voltage, gauge and temperature rating
The electrical rating in volts, amperes or watts
Ignition protection if applicable
The size of overcurrent protection that is to be installed
The sources for AC electrical power for a boat are:
a.
b.
c.
d.
Generator, Shore Power, Secondary of an Isolation Transformer, Inverter
output in the invert mode
Galvanic Isolator and Reverse Polarity Devices
Shore Power and generator only
An inverter in the pass through mode
2
10.
When more than one shore power inlet is installed, ABYC recommends that the
neutrals are
a.
b.
c.
d.
11.
Additional fuses or circuit breakers must be installed within _____ feet of the shore power
inlet if the power feed conductor from the shore power inlet to the main circuit breaker
exceeds:
a.
b.
c.
d.
12.
Ten feet measured along the conductor
72” measured along the conductor
40” measured along the conductor
Ten feet measured in a straight line
While installing a clothes dryer, it is noted that a neutral-to-ground strap is provided by the
manufacturer, as you must connect the clothes dryer to the boat’s AC grounding system. The
neutral-to-ground strap:
a.
b.
c.
d.
13.
not connected together
connected together
connected to the AC grounding bus
connected to the engine negative terminal
Must be removed
Is connected to the neutral conductor
Is redundant
Is never removed
Non-metallic clamps or straps should not be used for support of electrical
conductors:
a.
b.
c.
d.
Over moving shafts
Over any machinery or passageways if failure could result in a hazardous
situation.
Over engines
All of the above
3
14.
What is the minimum temperature rating for an AC conductor that will be used in an
engine space?
a.
b.
c.
d.
15.
The minimum rating for a flexible cord used in an AC electrical system should be at least:
a.
b.
c.
d.
16.
12 AWG if used in the shore power supply
14 AWG if connected to a generator output
16 AWG
20 AWG if connected to a 5 milli amp GFCI breaker
A branch circuit that supplies a combination of receptacle loads and permanently
connected loads, shall not supply fixed loads in excess of:
a.
b.
c.
d.
18.
600 volts
120 volts
240 volts
300 volts
The minimum wire size (gauge) that is permissible for use in an AC electrical system is:
a.
b.
c.
d.
17.
At least 75 degrees F and be oil resistant
Oil resistant and temperature is not important
At least 167 degrees F and oil resistant
At least 140 degrees F
600 watts for a 20 amp circuit
600 watts for a 15 amp circuit
1000 watts for a 15 amp circuit
2000 watts for a 20 amp circuit
All AC Conductors shall be supported or secured throughout their length at least:
a.
b.
c.
d.
Every 12 inches
Every 40 inches
Every 18 inches
Every 7 inches
4
19.
Reverse polarity is defined as the reversed connection of which circuits?
a.
b.
c.
d.
20.
Downrating of the ampacity of AC conductors to avoid excessive heat
up is done because of
a.
b.
c.
d.
21.
Voltage drop
Thin insulation
Bundling of more than 2 current carrying conductors
Too few wire strands
Between the green and white conductors
Between the white and black conductors
In the green wire
Between the black and green conductors
Which of the following is the function of the galvanic isolator?
a.
b.
c.
d.
23.
build
Reverse polarity indicators are installed
a.
b.
c.
d.
22.
neutral and ground
Line 1 and Line 2
Hot and neutral
Hot and ground
Block AC fault current and pass low voltage galvanic current
Block all AC current
Block low voltage DC current and pass AC current associated with the
grounding conductor
Reduce stray current corrosion
The recommended circuit location to install a galvanic isolator is between the
a.
b.
c.
d.
Shore power grounding conductor and the AC grounding bus
AC grounding bus and DC negative bus
Shore power neutral and AC grounding bus connected after the shore
power breaker
AC neutral and AC grounding bus connected ahead of the shore power
breaker
5
24.
Four 10 gauge AC current carrying conductors rated at 105 degrees C that are bundled
inside the engine compartment for a distance of 3’, must have their ampacity down rated:
a.
b.
c.
d.
25.
to 36 amps
to 30.6 amps
to 42 amps
to 35.7 amps
The transfer from one AC power source to another is made by:
a.
b.
c.
d.
a battery switch
a means that opens all current carrying conductors before closing the
alternate source
paralleling the sources
a means tat energizes the circuits from both sources before making the
circuit to the alternate source
6
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