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ABYC AEMC Chapter 10 (1)
ABYC AEMC Chapter 10 (1)
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ABYC AEMC Chapter 10Which of the following best describes the function of a galvanic isolator? - ANS-Blocks DC
current
A boat's hull potential is measured: - ANS-Between a reference cell and the engine negative
terminal or its bus.
During a corrosion survey the hull potential has slowly shifted by 30 mV over the course of I
hour. This indicates - ANS-Extreme underprotection
You have detected a harmful 250mA DC galvanic current flow from the boat's ground to the
dock ground through the shore-power grounding conductor. Statement A: A properly installed
and functional galvanic isolator should correct this. Statement B: A properly installed and
functional shore-power polarization transformer should correct this. - ANS-Statement A is
TRUE; Statement B is FALSE.
A-28.1 SCOPE This standard applies to the qualification and installation of galvanic isolators
used on boats equipped with alternating current (AC) shore power systems operating at
frequencies of 50 or 60 Hz, and less than 600V, wired in accordance with ABYC E-11, AC & DC
Electrical Systems on Boats and ABYC TEI-2, Three Phase AC Electrical Systems on Boats.
NOTE: Boats with_______ in contact with water are subject to galvanic corrosion when
connected to shore power as a result of connection to the common AC grounding conductor.
This connection will affect the vessel's cathodic protection system. The use of a galvanic isolator
may reduce these effects. - ANS-metal
A-28.4.1 ___________ (green or green with yellow stripe) -A protective conductor, which does
not normally carry current, used to connect the metallic, non-current carrying parts of electrical
equipment to the AC grounding system, engine negative terminal, or its bus, and to the shore
AC grounding conductor through the shore power cable AC grounding conductor. - ANS-AC
Grounding Conductor
A-28.4.2 ________-Fault Current Path -An intentionally constructed, permanent, low impedance
electrically conductive path designed and intended to carry current under ground-fault
conditions from the point of a ground fault on a wiring system to the electrical supply source and
that facilitates the operation of the overcurrent protection device. - ANS-Effective Ground
A-28.4.3 ________________-An isolator that, if after meeting all other criteria of this standard,
meets the requirements of an effective ground-fault current path when subjected to the test
conditions in Table 1. NOTE: The device will continue to provide grounding continuity but will not
provide galvanic isolation in the event of a failure. - ANS-Fail Safe Galvanic Isolator
,A-28.4.4 ________________- The corrosion that occurs at the anode of a galvanic cell caused
by the flow of ions from the anode to the cathode through an electrolyte. - ANS-Galvanic
Corrosion
A-28.4.5 _____________ -An electrochemical cell consisting of two or more metals having
different corrosion potentials, electrically connected and in contact with a common body of
electrolyte. - ANS-Galvanic Cell
A-28.4.6 __________ The electric current that flows between metals or conductive non-metals
in a galvanic cell. - ANS-Galvanic Current
A-28.4.7 ____________ -A device installed in series with the shore power cable AC grounding
(green or green with yellow stripe) conductor to block low voltage DC galvanic current flow, but
permit the passage of alternating current normally associated with the shore power cable AC
grounding (green or green with yellow stripe) conductor. - ANS-Galvanic Isolator
A-28.4.8 Independent Laboratory-A laboratory that: A-28.4.8.1 is _______ as a regular part of
its business, in performing periodic inspections and tests that are the same as, or similar to, the
inspections and qualification tests required for the equipment or material being evaluated, -
ANS-engaged,
A-28.4.8 Independent Laboratory-A laboratory that: A-28.4.8.2 has, or has___________ to, the
apparatus, facilities, personnel, and calibrated instruments that are necessary to inspect and
test the equipment or material being evaluated, and - ANS-access
A-28.4.8.3 is not owned or controlled by: A-28.4.8.3.1 the______ of the equipment or material to
be inspected or tested or any similar equipment or material; - ANS-manufacturer
A-28.4.8.3 is not owned or controlled by: A-28.4.8.3.2 a_______ of the equipment or material to
be inspected or tested or a vendor of similar equipment or materials; or - ANS-vendor
A-28.4.8.3 is not owned or controlled by: A-28.4.8.3.3 a______ of materials to the manufacturer.
- ANS-supplier
A-28.4.9 ________ -An integral or external device that provides an indication of the inability of
the galvanic isolator to conduct AC current. - ANS-Status Monitor
A-28.5.1 Galvanic isolators shall be______ by an independent laboratory to establish
compliance with this standard. - ANS-tested
A-28.5.2 Galvanic isolators and their status monitors shall be provided with______ covering
installation requirements, including a complete set of electrical instructions with diagrams, and -
ANS-instructions
,A-28.5.2 Galvanic isolators and their status monitors shall be provided with instructions covering
installation requirements, including a complete set of electrical instructions with diagrams, and
A-28.5.2.1 operation and in-service______ requirements, and - ANS-testing
A-28.5.2 Galvanic isolators and their status monitors shall be provided with instructions covering
installation requirements, including a complete set of electrical instructions with diagrams, and
A-28.5.2.2 for galvanic isolators providing studs or nuts for connection, the proper _________ of
the stud or nut. - ANS-tightening torque
A-28.5.3 All exposed materials used in galvanic isolators and mounting hardware shall
be______ resistant. - ANS-corrosion
A-28.5.4 Galvanic isolators using diodes shall use a _______ capacitor(s), or equivalent method
of meeting the requirements of A-28.12.4. - ANS-non-polarized
A-28.5.5 Galvanic isolator components shall be electrically isolated from the external housing so
that galvanic isolators can be mounted directly on a ___________. - ANS-conductive surface
A-28.5.6 For all electrical tests, all galvanic isolator components shall be tested to the
_________ criteria found in TABLE I. - ANS-fail safe
A-28.6.1 The galvanic isolator shall be connected in series with the shore power cable AC
grounding conductor (green or green with yellow stripe) in a manner that no other ground
conductor will bypass the isolator back to the shore power ground (see A-28 Figure I). NOTE: In
some__________ systems, there is a possibility of bypassing the galvanic isolator through
connection of additional ______ equipment (e.g., amplifier splitters, computer equipment, etc.).
Additional isolation may be required on shielded connections. - ANS-Community Antenna TV
(CATV)
A-28.6.2 All AC power inlets and all telecommunication inlets (e.g., cable, phone, etc.) shall be
________from hull and deck, if conductive, and wired so that no part of the grounding system
bypasses the isolator. - ANS-electrically isolated
A-28.6.3 The current rating of the galvanic isolator shall not be less than the rating of the
____________ disconnect circuit breaker as installed per ABYC E-11, AC & DC Electrical
Systems on Boats. - ANS-main shore power
A-28.6.4 The galvanic isolator shall be installed in a ventilated, dry and accessible location not
to exceed the ________ rating of the unit. - ANS-temperature
A-28.6.5 If installed, status monitor indicator(s) for the galvanic isolator shall be in an accessible
_________ and visible when operating the AC system. - ANS-location
, A-28.6.6 If the status monitor is installed in a location where it will be subjected to rain or spray
the enclosure shall have a rating of__________ Degrees of Protection Provided by Enclosures
(IP Code) IP64 or NEMA 250 Type 4X. - ANS-IEC 60529
A-28.6.6 If the status monitor is installed in a location where it will be subjected to rain or spray
the enclosure shall have a rating of IEC 60529 Degrees of Protection Provided by Enclosures
(IP Code)_____ or NEMA 250 Type 4X. - ANS-IP64
A-28.6.6 If the status monitor is installed in a location where it will be subjected to rain or spray
the enclosure shall have a rating of IEC 60529 Degrees of Protection Provided by Enclosures
(IP Code) IP64 or ________. - ANS-NEMA 250 Type 4X
A-28.6.7 Conductor(s) shall be supported and/or clamped to relieve strain within _ inches of the
isolator case. - ANS-6
A-28.7.1 In dual shore power cord applications using a single isolator; the current rating of the
galvanic isolator shall not be less than the___ of the ratings of the main shore power disconnect
circuit breakers as per ABYC E-11, AC & DC Electrical Systems on Boats. - ANS-sum
A-28.7.1.1 A grounding conductor shall be installed from each______ hull inlet to the AC shore
grounding connection on the galvanic isolator. - ANS-individual
A-28. 7.1.2 The ampacity of the grounding conductor from the point of connection on the
galvanic isolator to the boat's AC grounding system shall not be less than the sum of the ratings
of the __________ disconnect circuit breakers. - ANS-main shore power
A-28.8.1 The galvanic isolator and its ____________ shall be marked with the following
information: - ANS-status monitor
A-28.8.1 The galvanic isolator and its status monitor shall be marked with the following
information: A-28.8.1.1 the ___________, and - ANS-manufacturer's identification
A-28.8.1 The galvanic isolator and its status monitor shall be marked with the following
information: A-28.8.1.2 the product identification or __________, and - ANS-model number
A-28.8.1 The galvanic isolator and its status monitor shall be marked with the following
information: A-28.8.1.3 the AC electrical system rating in __________ (e.g., I 20VAC, 60 Hz,
etc.), and - ANS-volts and hertz
A-28.8.1 The galvanic isolator and its status monitor shall be marked with the following
information: A-28.8.1.4 the _____________ at 30°C (86 °F) if so rated, or at S0°C ( I 22°F) if so
rated, and - ANS-maximum current rating
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