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Power cord ground terminal grounded to thru-hulls
I agree with Chuck on grounding. Only an idiot would NOT ground the AC systems to other items on the boat. As an example suppose your hot water heater developed an AC short to its case. You are standing in the bilge hanging across the engine to reach the thing to work on it. The engine is at ground via the shaft etc. If the water heater is not bonded to the engine ground you get zapped! This is only one example of what will happen if you don't have things tied together on a boat. It is next to impossible to insure that there will be no AC leakage in any piece of equipment especially in the marine environment. Even the boats that try to maintain isolated underwater (thru hull etc.) items are a risk. As long as the items maintain isolation it works ok but as soon as some worker comes aboard and "fixes something" the chances of the isolation remaining drops. The only cure for the galvanic problem is an isolator or better yet the isolation transformer. Testing to see if you have any faults with an ohmmeter to the marinas ground pin on the shore cable is futile. There will usually be several millivolts of voltage above ground on the shore power ground pin and some DC offset voltage that will immediately invalidate your ohmmeter reading. Measuring for DC current between the shore ground and the boat ground will tell you if there is a galvanic problem. Regards Gary |
#2
posted to rec.boats.electronics
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Power cord ground terminal grounded to thru-hulls
There is a solution to the degraded performance of galvanic isolators in the presence of AC leakage. See the article at http://www.yandina.com/GIsolCap.html |
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