So basically there was nothing wrong with the old way, it just didn't agree with what everyone else was doing.Help keep this website free. Oh yeah, the US had several representatives on that committee too. all agreeing on something!!!) So everybody chucked out their old color codes and adopted the ISO chart so they could sell their products across borders without any barriers. ![]() (Now that was a minor miracle, the French, Germans, English, Finns, Poles, Swedes, Norwegans, Italians, etc. ![]() What's that got to do with your question? ISO over the last 10-15 years came up with a color code chart that everyone in Europe could agree on. It is not cost effective to build boats for sale elsewhere to one standard, and those for sale in the US to another standard, so the industry wants a harmonized standard. But to sell in the European Union countries they have to be CE certified, and to do that they have to meet the ISO standards. Most of the recreational boats made in the world are made here in the USA. Just to answer part of Tim's question "red, yellow and blue were mains phases, and black was neutral" Someday standards will be the same, but not just yet. Recipes volume conversions are another big mess. I work on small appliances now, which are all metric, but I build test fixtures using the English nuts and bolts. An example is a Dodge being worked on the other day, had some metric and some English (SAE) threaded fasteners in the wheel well area. Heck, here in the USA, we still have a horrible mix mash of metric and English systems. ![]() have been working for years to reach consensus. IEEE, ISA, ABYC, NFPA/NEC, IEC, CSA, etc. Standards varying by industry, locatione, etc., and weren't really standard at all. The old standards were only standard in small geographic spots, which was fine if that is the only place you build anything, which was also a problem here in the USA. UK is just getting around to realizing that Europe is different (I am guessing) and that they need to join with the larger group standards that are recognized across the globe. IEC was used as much as NEC here in the USA the last 10 years or so. Just a guess to answer your question: I spent a career as a Controls Engineer. You really need to look for a good book on electronics, and go from there. Alternatively, a digital meter like the one at Often they will have a battery test feature with a moving coil meter. ![]() Most marine switch panels are simply a fuse, a switch and a 12 Volt LED (ie. The maximum curent which may be drawn from the battery will be the sum of all the current requirements for all the equipment. The panel itself obviously needs to serve Nav Lights, Interior Lights, Wipers, Horns, Stereos, Pumps and anything else you want to put on the boat.Īll your devices will have a current requirement, and assuming (for simplicity) that they all run on 12VDC, you then need to run adequate cable (based on current, not voltage) between the panel and battery. Personally, I would run the engine starter motor (assuming it has one) from a relay, rather than the panel directly, this allows you to use thinner wire to the panel and should save you both weight and money.
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