Marine Isolation Transformers

Overview

In 2017 NEC lowered the maximum permitted ground fault protection for boats on shore-power from 100mA to 30mA

Leakage current varies from boat to boat. Unfortunately, even with all electrical systems in good working order it will often exceed 30mA. This will trip the GFI circuit breaker in the pedestal and leave the boat without power.

Enhancing Shore Power Safety with MARINE-PUCK Boat Isolation Transformers

In the world of boating, safety on the water is paramount. A critical aspect of this is ensuring electrical systems on boats are not just reliable but also safe. The National Electrical Code (NEC) recognized this when it lowered the maximum permitted ground fault protection for boats on shore power from 100mA to 30mA in 2017.

While this new rule marked progress, boat owners were soon hit with a common snag: many boats often drew more than the newly set 30mA limit, causing electricity leakage. Because of this, boats were suddenly left without power as the Ground Fault Interrupt (GFI) circuit breakers kept tripping off, causing severe electrical safety worries. To fix this issue, Bridgeport Magnetics Group, Inc. introduces the innovative MARINE-PUCK Boat Isolation Transformers for your boat.

The solution is to install a Marine-Puck on your boat

Our Marine-Puck family recently acquired UL Marine certification for the US and Canada.

Marine isolation transformers eliminate shock hazards to persons on board and in the water adjacent to the boat. They also eliminate possible galvanic corrosion of metal hulls and propellers due to DC currents traveling through a shore ground connection, as well as nuisance tripping of GFI (ground fault interrupt) systems when on shore power.

The Power of MARINE-PUCK Boat Isolation Transformers

These boat transformers go beyond conventional electrical systems. They can be lifesavers, keeping everyone safe from electrical shocks on board and even in the water nearby. Plus, they stop the problem of galvanic corrosion on metal hulls and propellers when hooked to shore power. No matter the size or type of your boat, these are vital to have on board.

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.

Marine-Puck Brochure

Versatile Protection for Your Boat and Dock

Marine isolation transformers are not limited to boat installations. They’re also helpful for protecting dock lights, boat lifts, and smaller boats at their slips. It’s all about keeping your boat’s power flowing and putting safety first in every aspect of your sea adventure.

Bridgeport Magnetics Group, Inc., your partner in marine safety, takes pride in offering MARINE-PUCK Boat Isolation Transformers. They are a comprehensive solution using marine magnetics to ensure marine electrical systems are:

  • Safer
  • More reliable
  • Aligned with the latest regulations and standards.

With our high-quality boat isolation transformers, you can hit the high seas fearlessly, secure in knowing your vessel’s electrical systems are safeguarded by the industry leaders.

Boats can be dangerous, so safety tech that keeps things smooth sailing is essential. Reach out to Bridgeport Magnetics Group, Inc. today at 203-954-0050 to explore how MARINE-PUCK Boat Isolation Transformers can enhance the safety and reliability of your boat’s electrical system.

Isolation transformers eliminate shock hazards to persons on board and in the water adjacent to the boat. They also eliminate possible galvanic corrosion of metal hulls and propellers due to DC currents traveling through a shore ground connection, as well as nuisance tripping of GFI (ground fault interrupt) systems when on shore power.
Marine-Pucks are toroidal (ring shaped) isolation transformers fully embedded in solid epoxy resin inside a cup-shaped non-metallic enclosure. They are sealed hermetically and can be mounted onto a deck or a bulkhead.
There are many advantages of toroidal transformers versus conventional laminated types.

  • They are up to 50% lighter and much smaller.
  • They are quiet. No annoying hum when on shore power.
  • Marine-Pucks are double-insulated (class II devices) not referenced to ground in any way.
  • The Marine-Puck non-metallic enclosure combined with the solid epoxy potting compound eliminates shock and fire hazards due to broken or loose conductors touching a metallic case besides effectively preventing sea water from entering the transformer.

 

Overload Protection

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.

Inrush Surge

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.

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.

INSTALLATION OF MARINE PUCK

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.

WIRING OPTIONS AVAILABLE FOR THE MARINE PUCK FAMILY BELOW

PLEASE FOLLOW ALL NEC AND LOCAL ELECTRICAL CODES WHEN INSTALLING THE MARINE PUCK

Coming Soon! Contact Us for Details at (203) 954-0050

All MP Global models have double 120V 50/60Hz Primaries and Secondaries for maximum hookup connectivity and power configuration, and they are compatible with our optional voltage Boost Control System.

Coming soon

Model SIT-1200 Isolation Transformer

1200 watts 120V-120V Domestic

Dimensions: 7.75” OD x 3.75” HT; 14lb

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 in the utility room next to the breaker panel. Transformer primaries are hooked up to the circuit breaker serving the dock, and the dock wiring is transferred to the secondary windings, rendering the entire dock circuit floating without reference to earth ground. After the installation, the ground-fault current is inherently limited to max. 1 mA, greatly enhancing the safety of people and animals on the dock and in the water.

MODEL SIT-1200. AN OPTION FOR LOWER POWER NEEDS

Dock pedestals typically feature 120V 30A and 240V 25A power sockets, and most boat isolation transformers in the market are sized accordingly for 3600 or 6000 watts of continuous power. However, many boat owners do not need those amounts and are looking for less expensive smaller, and lighter isolation transformers. The same goes for owners of private docks, many with boatlifts, who are concerned with the safety of people and pets on the pier and in the water.

This category of boaters may be interested in another isolation transformer product, originally developed to protect inner-city dwellers from shock caused by touching defective light poles and traffic lights. These transformers feature similar construction and materials as our Marine Puck models but are rated only 120 V 10 A, 1200 watts. They are lower priced than full-size Marine-Pucks and easier to install in small spaces.

Two units can be combined for120 V/240V, 2400 watts of power.

MARINE ISOLATION TRANSFORMERS IN NEMA 4 ENCLOSURES

Marine Isolation transformers are used on-board vessels or dock-side as part of marina power distribution systems. The isolation transformers totally isolate the earth-bonded shore AC power from on-board electrical systems and greatly reduce the risk of shock caused by defective electrical systems, and largely eliminate corrosion of metal parts caused by stray AC current.

Problems with the AC supply may be caused by insulation breakdown, immersed wiring, incorrect wiring or equipment failure. If the 3rd (green) ground wire is connected to the on-board bonding circuit, corrosion, excessive erosion of zinc electrodes and shock due to stray current may result. In addition corroded wiring in the shore installation may send considerable voltages down the ground wire without tripping the AC circuit breaker causing damage to on-board electronics.

 

Our five standard design marine isolation transformers are available in either light gray powder coated or stainless steel enclosures.

 

Advantages of Toroidal Isolation Transformers

The advantage of a toroidal transformer is that it allows the stainless steel enclosure to be much smaller than when a conventional stacked lamination type transformer is used. Smaller dimensions also mean much lower total weight of the enclosed isolation transformer. 
Both features are of paramount importance on-board vessels of any size.

Isolation Transformer Safety Standard Certifications

E509703 UL Marine certification for the US and Canada

UL 60601.1, CSA C22.2 No 601.1-M90 (1990), EN61558-1, IEC60601-1, CE Marking 
Medical Safety Standard with maximum leakage current of 100 to 300 microamperes depending on the power rating of the transformer.

Enclosure Specifications

NEMA 4X  style, 14 gauge light gray powder coated or stainless steel water tight enclosure with hinged and lockable door. Input and output wires are terminated through sealed stress relief cable glands at the bottom of enclosures to a terminal block inside the enclosure.

Reach Us

Contact Us for Information and Sales

6 Waterview Drive, Shelton, CT 06484

sales@bridgeportmagnetics.com

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