Tom — this means that the ground (green wire) and neutral (white wire) are tied together somewhere in your AC system. You’ll need to trace the wiring throughout the AC system and see if they’ve been tied together somewhere. You can try disconnecting AC-powered gear (shorepower charger, water heater, etc) completely and rechecking the resistance between the green and white wires of the system to see if anything changes. Obviously, you’ll want to disconnect from shorepower first (!), and make sure any inverter you might have onboard is completely disconnected from the DC system first.
Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI :^( On Jun 2, 2014, at 1:46 PM, Tom Buscaglia via CnC-List <cnc-list@cnc-list.com> wrote: > I received the following email from our club regarding our AC electric. Any > C&C listers able to elucidate as to what this means and what you would > anticipate it will take to correct? > >> Tom, >> >> I have been doing electrical tests on new boats in QYC docks recently. In >> reviewing the records of previously tested boats I noticed an anomoly in the >> recorded results of one of the tests that was done on Alera. Apparently, I >> overlooked or ignored this when I tested Alera. >> >> One of the measurements recorded indicates a very low resistance (20 ohms) >> from your AC plug neutral wire to the AC plug ground wire. All the other >> measurements were high resistance and OK. This low resistance would indicate >> that your boat's AC system has the neutral wire connected to AC ground >> somewhere. While this is normal in home wiring it is not standard on boats. >> It creates a shock hazard. It is against ABYC standards for small boat 120 >> VAC, 30 A systems. >> >> I highly recommend that you have this looked into and corrected. I would be >> happy to help you checking this out if you want to deal with it yourself. >> >> J > > thx > Tom Buscaglia > SV Alera > C&C 37+/40 > Vashon Island WA >
_______________________________________________ This List is provided by the C&C Photo Album Email address: CnC-List@cnc-list.com To change your list preferences, including unsubscribing -- go bottom of page at: http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com
