Also, the ProMariner FS Series is a “fail-safe” type isolator; no remote panel needed. Under $300 for a 30-amp unit.
http://promariner.com/products/galvanic-isolation/prosafefs-series/ Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > On Oct 28, 2015, at 11:29 AM, Frederick G Street via CnC-List > <cnc-list@cnc-list.com> wrote: > > Steve — the “fail-safe” versions of galvanic isolators are also > ABYC-approved, and don’t require the remote panel. There’s a company up in > our neck of the woods that started out making electrical equipment for dairy > farms; they realized that their ground isolation products would also work > well on boats, so they expanded into the marine market. All their units are > the “fail-safe” types, and their prices are reasonable. > > http://www.dairyland.com/products/galvanic-isolator > <http://www.dairyland.com/products/galvanic-isolator> > http://www.deimarine.com <http://www.deimarine.com/> > > > Fred Street -- Minneapolis > S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( > >> On Oct 28, 2015, at 11:24 AM, S Thomas via CnC-List <cnc-list@cnc-list.com >> <mailto:cnc-list@cnc-list.com>> wrote: >> >> Ed, >> What you say is true from the perspective of having effective >> galvanic isolation, but there are a couple of design issues that come to >> mind. In order for galvanic isolation to work, all wiring grounds to the >> boat must be interrupted by a galvanic isolator. This means that if there >> are two shore power receptacles then both of them would have to have their >> wiring grounds taken to the isolator and then out again to the distribution >> panel(s). From an engineering perspective, a wiring ground only needs to >> have enough capacity to reliably trip a circuit breaker without catching on >> fire, but most electrical codes require that they have the same capacity as >> the main conductors. In other words, if you care about regulations and some >> people on this list have indicated that they do, then the galvanic isolator >> would most likely have to have at least the current capacity of the sum of >> both shore power receptacles. >> According to the instructions that came with a galvanic isolator that a >> friend of mine bought last year, a galvanic isolator requires an (optional >> and at an additional cost for that particular product) indicator light to be >> ABYC compliant. I was shocked at the price tag on the commercial units. The >> prices are grossly out of line with what they actually contain. >> If you don't care about the light and just want something that works, >> then a big enough bridge rectifier, 30 amps for example, with the DC >> terminals connected together will work fine and cost a lot less than >> something that says "marine" on it. The voltage rating of the rectifier does >> not matter, just the current rating. It will provide about 1.2 volts of >> isolation from the mains ground. >> >> Steve Thomas >> Port Stanley, ON
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