In 2017 NEC lowered the maximum permitted ground fault protection for boats on shore-power from 100mA to 30mA
| Model | Application | Power [KVA] Continuous | Voltage | Dimensions | Weight [Lbs.] | ||
|---|---|---|---|---|---|---|---|
| Input [V] | Output [V] | OD | Height | ||||
 MP3.6-30A |
50/60Hz (Global) | 3.6 | 120/240 | 120/240 | 10” | 5” | 45 |
 MP6 25A |
50/60Hz (Global) | 6 | 120/240 | 120/240 | 12.6” | 6.5” | 80 |
 Dual MP6 50A |
50/60Hz (Global) | 12 | 120/240 | 120/240 | 2x12.6” | 6.5” | 150 |
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.
The solution is to install a Marine-Puck on your boat
Isolation transformers eliminate shock hazards from 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.
There are many advantages of toroidal versus conventional laminated types.
Our Marine-Puck family recently acquired UL Marine certification for the US and Canada.
- 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).
- 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 ingress.
