YANDINA Galvanic Isolator Plus Instruction Manual
- October 28, 2023
- YANDINA
Table of Contents
GALVANIC ISOLATOR PLUS
2.5 Volts for ALUMINUM HULLS
Model GI+
Installation Instructions For 30- or 50-amp
SUMMARY
Aluminum hulls have a built-in electric potential of -0.75 to -1.0 depending on the alloy, temperature, salinity, and movement. Conventional Galvanic Isolators provide about 1 2 volts of isolation so protection is degraded by up to 80% to negative stray voltages when applied to Aluminum hulls. The Yandina Galvanic Isolator PLUS for metal boats or aggressive locations provides approximately 2.5-volts isolation in the ground lead of your shore power supply to isolate DC and AC electrolytic voltages coming from the dock but yet pass safety currents to ground in the event of a short circuit, wiring error or power leakage on your boat.
FEATURES
- 50-amp AC continuous rating. Use on any shore power connection up to 50 amps.
- Only one required for dual 30-amp connections.
- Works on 115- or 230-volt supply, one or two phase.
- Will work on foreign hook-ups with ground wire.
- Failsafe, Large Capacitor included
- Meets ABYC electrical standards. (Except 2.5-volt rating exceeds specifications)
- Waterproof – will operate underwater No heat produced under normal use.
- Two 18″ 10-gauge Marine Grade leads.
- Non-metallic housing with mounting tabs.
- Ignition protected for use in explosive atmospheres. Suitable for operation up to 122F or 50C
- Mounting and connection hardware included.
- Very compact size, 8″ x 3″ x 1.5″
THEORY OF OPERATION
Boats with metal in contact with water are subject to galvanic corrosion when
connected to shore power. This is a result of connection to the common AC
grounding conductor. This connection will affect the vessel’s cathodic
protection system resulting in abnormal deterioration of the zincs, and can
result in damaging corrosion of the underwater hull and equipment.
It is necessary for safety reasons to have the hull and exposed metal fixtures
connected to ground to prevent electrical shock in the event of a failure in
the AC wiring, or an appliance. Without that ground connection, the boat could
become alive at the line voltage, which could injure or kill when stepping
onto the boat, or swimming in close proximity.
If an electrical fault doesn’t trip the breaker, the ground connection has to
be able to withstand rated current indefinitely to conduct the fault current
and prevent dangerous voltages. The Yandina Galvanic Isolator PLUS is rated
for 50-amps AC continuous current and each isolator is individually tested to
135% of this rating per ABYC standards until the temperature stabilizes.
SAFETY CONSIDERATIONS
The galvanic isolator is connected between the internal grounding system on
your boat and the ground lead of the shore power cable(s). This connection is
important for safety considerations and you should not attempt this
installation unless you understand the circuit and are competent in this type
of electrical work.
Although highly reliable, it should be tested once per season, and re-tested
after a condition that may have influenced it, such as a lightning strike in
the vicinity, or an on-board electrical short that either caused a circuit
breaker or fuse to rupture, or if the ground connection was used in error for
the neutral conductor.
INSTALLATION
- Mount the isolator inside the vessel to any convenient surface, preferable within about 15 inches of the shore power entry connector using the screws supplied.
- Disconnect the shore power cord to prevent electric shock while working on the connector
- Remove the existing ground wire from the shore power connector. The ground wire is usually green, or green with a yellow stripe. If there is any uncertainty to which is the ground wire, get competent help before proceeding.
- Connect either of the green leads from the isolator to the vacated terminal of the shore power connector.
- Connect the other green lead from the isolator to the vessel ground wire you removed, using the U-bolt connector supplied. Shorten the leads if necessary.
- Dress and attach the wires so they are firmly fastened. It is not necessary to insulate the compression connector, but you can wrap it with insulation tape if desired.
- For dual 30-amp cords, connect their ground terminals together before passing through the Galvanic Isolator PLUS. See the schematic diagram on the next page.
- IF THE ENTRY ACCESS ABOVE IS INCONVENIENT OR COVERED, CHOOSE THE NEXT DOWNSTREAM GROUND CONNECTION LOCATION.
TESTING
Diode testing meters are frequently unreliable for testing a 2.5-volt diode
instead of standard 0.6-volt.
Remove the shore power cable from the dock end only and bring the loose end
aboard. Make up a simple test circuit using a battery (6-volts or more) and
lamp that lights when the circuit is closed. Do not use a battery already
installed on the boat wiring.
Connect the test circuit to the ground pin of the shore power cable and any
on-board ground and check the lamp lights. Measure the voltage between the
test leads is around 2.5- to 4-volts depending on the size of the bulb. A
lower or higher reading indicates the isolator has failed.
You should then reverse the connection to the isolator and repeat the test
with the current flowing the opposite direction.
Yandina LLC. 1 Year, Factory-Direct, Limited Warranty
INSTALLATION HELP www.yandina.com
TECHNICAL EMAIL QUERY
techsupport@hypertech.com
or call 901-382-8888.
Made in the USA
DUAL 30 AMP SCHEMATIC
Documents / Resources
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YANDINA Galvanic Isolator
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