It links all major components together for a common groundand allows the zinc anodes and Mercathode to better protectthe drive system from galvanic corrosion. Finally, in addition to lacking compliance with ABYC standards, tapping screws are notorious for loosening, particularly if driven into wood or fiberglass, when used to secure electrical ring terminals. Stray current corrosion can consume underwater metals like the propeller shown here in just a few days. These anodes are sized and designed to protect only these components. The bonding system is a system that serves multiple purposes in a typical scenario. Connect a 4 AWG battery cable from the base of your aluminum mast to the nearest keel bolt from external ballast. Note that this meets the ABYC recommendation. Some bonding system faults can create dangerous situations leading to fire, electric … See Practical Sailor, August 15, 1995 for a detailed treatment of the green wire. In the simplest of terms, bonding systems are an interconnection of underwater metallic components, including through hulls, struts, rudder stocks, and propeller shafts. West Marine is committed to outfitting your life on the water. When you're done, there will be heavy conductors running from the external keel or lightning ground plate to the mast, stays, and to the metal fuel tank, but there will be no DC connections to the engine or to the yacht's electrical system. ➤ Connect one end of the wire to a bonding ground source on your boat, like a rail or motor-mount bolt. Stray-current corrosion occurs when direct current, i.e., from a battery, “leaks” into water, typically bilge water (often from faulty bilge pumps or their wiring). Our first thought might be to simply make the ground connection to a metal thru-hull, propeller shaft or other underwater metal. He’s held speed records for sailing around the world, as well as sailing across both the Pacific and Atlantic Oceans. November 9, 2019 by Larry A. Wellborn Variety of boat bonding wiring diagram. Figure 3. So what to do? It is good practice to include the HF/SSB radio itself in this network of ground tapes. These DC currents in the water will cause electrolytic corrosion to your bonded thru-hulls or metal parts. We will cover the above items one-by-one in more detail. The anodic bit of metal or thru-hull that has the misfortune to be on the "out current" side of the current running through your bonding system will also become "out metal" and will disappear, sometimes rapidly. Definition: Bonding noun 1: fastening firmly together [syn: soldering] Overview. In an increasing number of marinas, there are substantial DC electric currents running through the water. A boat that has all the hardware bonded will suffer much less corrosion. Coat with corrosion inhibitor when complete. I’m installing a bonding system on my boat. Have each of the cables that are used for lightning ground wires lead as directly as possible to the same keel bolt, with any necessary bends being smooth and gradual. In those cases, the shaft brush provides a link to the vessel’s bonding system and the anodes to which it is connected, the advantages of which will be explained below. In choosing Galvanic Isolators, make sure that you select one that has a continuous current rating that is at least 135% the current rating on the circuit breaker on your dock box. Honey is a highly decorated competitive sailor with a sublime record as an ocean navigator. Figure 4. For those of you not familiar with all of this, the bonding system on your boat is the green wire (most boats) you see in your bilge area that connects all the metal parts on your boat that are in contact with sea water. Leave lead keels/ballast isolated. It does not need to conduct DC, and as described in "Bonding and Electrolytic Corrosion..." above, you do not want to connect another DC ground to your engine and to your keel etc. The key factor here is that the yacht's electrical system is connected to seawater ground at one point only, via the engine negative terminal or its bus. Once the DC connection from the mast to the VHF is broken, check for any other connections with an ohmmeter, and straighten out any other wiring errors or unintended connections. Your zinc is only intended to protect against the modest galvanic potentials and therefore currents that are caused by the dissimilar metals that are immersed and electrically connected together on your own boat. You can use a socket wrench to remove a bolt on the engine and place the wire there. Thirdly -- a major point here -- the AC power system on the boat (green wire) is also grounded to the boat’s common ground point, usually established at the engines. An isolated bronze thru-hull doesn't need protection because it is not in electrical contact with another immersed dissimilar metal. Shop with confidence - get free shipping to home or stores + price match guarantee! In addition to the AC ground, we need a DC ground or return line, a lightning ground, and a RF ground plane for the radio systems. Brooklin, Maine 04616 USA Do not rely on a thru-hull or a sintered bronze radio ground (e.g. While this interconnection method works well, it has limitations. Unfortunately, a connection between any of these systems and underwater metal can, and probably will, give rise to serious electrolytic corrosion problems. Fortunately, it works pretty good. This often neglected system is what is supposed to keep all of the underwater metal components at the same electrical potential. If your GFCI starts to nuisance trip, it is probably a very good idea to track down and clean up your damp wiring in any event. The RF ground needs to be a ground for RF signals only. Turn off every electrical device on the boat. One of the most misunderstood of these is the distance over which an anode can provide protection. 9, 2019 by Larry A. Wellborn Variety of boat bonding wiring diagram is highly! Oxides are the toxic agent cost substantially more than conventional galvanic Isolators master battery switches, if they,... Bonding and other onboard electrical connections to seawater at one point only via! A good rule of thumb is that all metals that touch bonding system on a boat water as requirements... Electrical circuit touch the water interchangeably, there are substantial DC electric currents running through the water these is hare... Some measure of protection underwater ( e.g our water pipe or by a! Tidy job of it the boats bondingsystem is basically a “ Daisy ”! Thought suggests that if you have internal ballast, you might ask, is for... 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