[concetxo01]

Marine-Puck complies with ABYC Standard E11.17.3.5, Polarization Transformers, except for the enclosure being non-metallic. A grounded metallic enclosure would run counter to the general trend towards composite or plastic junction boxes, and ne-gate Marine-Puck’s status as a class II device. The Marine-Puck ABS enclosure combined with the solid epoxy potting com-pound eliminates shock and fire hazards due to broken or loose conductors touching a metallic case besides effectively pre-venting sea water from entering the transformer. [links]

[Versus71]

Marine-Puck feature toroidal (ring shaped) isolation transformers which are much lighter and more compact than traditional transformers. When turned on they may experience a brief Inrush Current surge, which may in a rare event cause the input circuit breaker to trip. In our experience an efficient remedy is selecting a D-curve (delayed action) circuit breaker. – Another solution is to mitigate the Inrush surge by pre-magnetizing the core briefly as the transformer is turned on. A convenient way to do this is to install resistors in the form of quartz halogen bulbs across the contacts in the input circuit breaker. The circuit breaker is opened before the shore cable is plugged in causing a low current to pass before the transformer is fully turned on by closing the input breaker. The bulbs are only on at reduced power during the time between plug in and turn on and will never need to be replaced.

[bagazaga]

Isolation transformers must be protected from overload by a dual circuit breaker installed between the shore cable entry point and the transformer primary side. The breaker rated current must be equal to or less than the transformer continuous current rating, 30Amp for a 120V MP3.6, 25Amp for a 240V MP6 and 50Amp in case of an MP6 wired for 120V. We recommend selecting a D-curve (delayed action) breaker. Please see below.

[smokelesscigs124]

Mounting: Marine-Puck mounts on top of or below a deck or a bulkhead with a central carriage bolt and washer. Input and out-put wiring may exit from the rear through the mounting surface or radially through the lower rim in any orientation. All models feature two secondary 120V secondary windings which may be user connected in parallel for 120V service or in series for 120/240V service.

[cyclonite]

Overload Protection here

[RubyShemp]

MARINE-PUCK PRODUCTS FOR BOAT DOCK SAFETY
Besides being used onboard boats, Marine-Puck products are installed on land to enhance touch safety of dock lights and boatlifts and for protection of smaller boats that hook up while moored at their home slip. The most practical installation is… read more on Low Power Isolation Transformer TAB. [links]

[melvster]

While galvanic isolators can be very effective at blocking corrosion, they are not foolproof; they are limited in their effectiveness. For absolute isolation and corrosion protection, a transformer would need to be wired in isolation mode, making a galvanic isolator unnecessary.

[kytradersclassifieds]

Polarization transformers ensure, as the name implies, that the polarity of the electricity that is provided to the boat is correct. Therefore, if the polarity of the wiring on the dock is somehow compromised, the neutral and hot wires are reversed (“neutral” and “hot” are, roughly speaking, the alternating current or AC equivalent of direct current, or DC, “ground” and “positive”) for instance, once passing through the transformer the fault is corrected.

[30dirtybirds]

Before delving into the details of how transformers work, it’s important to make the distinction between the two types that are available, polarization and isolation, and that distinction is purely a matter of how the transformer is wired. The hardware itself remains the same in either case. more

[Lord Juan]

In a polarization transformer the green safety grounding wire that comes aboard the vessel from the dock, inside the shorepower cord, is connected to the vessel’s own green safety grounding, bonding and DC negative systems (i.e., shore and vessel grounds are common.) Hold that thought, it’s important. here

[Tara01]

In the latter case, in order to afford the vessel some protection against corrosion that originates aboard other vessels, a galvanic isolator must be used in conjunction with the polarization transformer (for more on galvanic isolators see this Channels e-newsletter article: http://www.passagemaker.com/subscriptions/channels-e-newsletter/item/1485-galvanic-isolators-and-zinc-anode-selection. [links]

[lysacor]

If you’re looking to reduce galvanic corrosion caused by stray current from other boats, Fisheries Supply offers galvanic isolators and marine isolation transformers from all the best brands, including Mastervolt, Pro Mariner, Newmar, Guest and Charles. Marine galvanic isolators interrupt galvanic circuits with other boats and the dock when your boat is plugged into shore power, while a marine battery isolator completely isolates the onboard AC system from the shore power AC system. Let our knowledgeable sales people help you protect your boat today!

[adamjkok]

[Chuck]

more

[aliceross222]

Isolation Transformers provide ultimate safety and electrolysis protection for shorepower systems. Essential for aluminium boats and preferred for any boat.

[Tasja]

It is also recommended, for optimal safety, to connect the secondary neutral of the transformer to ground when the boat is out of the water.

[ircicq]

Safety is taken for granted in case of a normal on-shore installation. A fuse will blow or a GFCI (Ground Fault Current Interrupter) will trip in case of a short circuit or current leakage to ground. Connecting the ground wire of the shore-side supply to the metal parts of the boat will result in galvanic corrosion (see below). Bringing only the live and neutral wire on board results in an unsafe situation because GFCI’s will not work nor will a fuse blow in case of a short circuit to a metal part on the boat. more