![]() The accumulation of fine salt mist over years can build up on exposed equipment and slowly increase the leakage to ground until you start getting nuisance trips on your interrupter. Independent of their "title" fault interrupters are a significant safety factor however they can be a nuisance on older boats. You can verify this because GFIs will work in two wire circuits and don't need a ground connection - check your hair dryer. Any imbalance caused by current going to ground on the downside of the GFI causes an imbalance voltage to be generated in the third coil which trips the breaker. It has a triple coiled transformer with the hot in one primary coil and the neutral in the second opposing each other so if the current is equal there is no output in the secondary coil. No, a GFCI or GFI works the same way as you described the RCD. The site is often criticized for their commercial connections and the West Marine brand name but they've been in business for 13 years and the only marine electronics manufacturer that offers unlimited warranty on all their products. That makes them unpopular with vested interests who have been ripping boaters off for years. "They're trying to sell their $195 isolator, that's all." I guess that is true however they are selling an isolator that exceeds ABYC recommendations, carries an UNCONDITIONAL warranty and sells for under $100. I've measured as much as 5 volts AC between a dock outlet ground and "Earth's potential". So if you are in a dock in the vicinity of the faulty wired boat, your ground lead will have AC voltage on it which represents the voltage drop between the boat injecting current into the ground wire and the eventual dock bonding location where ground and neutral are connected. The ground wire in docks is often a light gauge since it is not designed to carry heavy and continuous currents - just sufficient to blow a circuit breaker under fault conditions. Mis-wired boats can return the AC current through the ground wire instead of the neutral. Ultimately they are the same: Earth's potential. "Also, that the ground and neutral being bonded at the dock wiring makes a difference. "I haven't looked through the rest of the site I thought the preamble said it all." That appears to be true - he obviously didn't read the article. Current is traditionally considered to flow from positive to negative. "state that electrons travel from Positive to Negative" The word "electron" or "electrons" appears nowhere in the article. "they state that the anode is more positive" As any high school student will know, ANODE is positive by definition. "They confuse Galvanic cells with Electrolytic cells " Galvanic cells are not mentioned anywhere in the article. The article doesn't pretend to be authoritative the title says "Non Technical". Jim is full of critical rhetoric but no facts.Ĭriticism is easy but vacuous if unsupported.
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