Data for this can come from any number of Galvanic Series or Galvanic Scale charts. These metals serve as the least noble metal in order to sacrifice themselves and protect/save your brass, bronze or other underwater metals from galvanic corrosion. Anode materials include Mil-Spec aluminum, zinc or magnesium. This is why we use what are called anodes to protect our expensive under water metals. The more noble metal survives while the less noble metal (anodic) becomes the anode and is eaten away from the galvanic that’s current created by the differences in voltage potential of the different metals. The creation of a galvanic current occurs when dissimilar metals, with differing galvanic voltages, are immersed in an electrolyte (water). Simple, and is effective at blocking galvanic level current. The critical difference between a bare green grounding wire is a GI, is the GI won’t allow the passage voltages/current below 1.2V. In other words it allows fault current to flow through the wire for human safety. The reason for having two diodes, in each direction, is so the green wire is not simply check valved or blocked and acts just like a wire would. Two diodes in series results in approximately a 1.0V – 1.2V threshold for blocking galvanic level current. Each diode drops approximately 0.6V or put another way requires more than 0.6V to open and allow for current to pass. This blockage of low voltage DC galvanic level current is achieved by using two diodes in each direction. As mentioned above the purpose of a GI is to block low voltage galvanic level DC current while still allowing any AC fault current to pass through the green wire to ground and allow it to activate fault protection devices. Not many electrical jobs on boats are this simple. Simply cut the AC green wire in two, crimp on two terminals and connect them to each stud.
#PROSAFE FS30 INSTALL#
To install a GI all one needs to do is to break the green wire, after the shore power inlet, but before the AC panel. If you plan to plug into shore power, you’ll need a galvanic isolator at a bare minimum. isolation transformer is a whole other discussion & topic. we absolutely prefer an isolation transformer (IT) over a GI but the conversation of a galvanic isolator vs. If plugging in at a marina a GI is a bare minimum level of protection a boat owner should have. GI’s are a very simple hook up and installation, even for the average DIY, but ensuring you never lose your AC safety grounding conductor is of critical importance. While the purpose of the GI is blocking galvanic level current, it also has to allow for the passage of AC fault current. What exactly is a Galvanic Isolator (GI), why do you need one & why on Earth would you need to test one? These and other questions will all be answered in this article.Ī galvanic isolator is a device that is inserted, in series, into the AC green grounding wire (safety ground) of your shore power feed to help minimize or reduce the effects of galvanic current from flowing into your vessel.
The ProMariner ProSafe FS30 & ProMariner ProSafe FS60 both meet the current ABYC Fail Safe standards. To meet the current safety standards you would need a “Fail Safe” unit that has been tested to the ABYC Fail Safe standards. WARNING: The galvanic isolator used in this article does not meet the current safety standards.
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