On 4/3/2011 8:25 PM, James Maynard wrote: > It bears on why I am wiring my boat to ABYC standards rather than the > model National Electric Code (NEC) from the National Fire Protection > Association (NFPA) -- and on why I am*not* fusing the negative lead in > runs from my batteries to branch circuits such as the one that feeds my > ham equipment.
It's critical to realize that Codes and Standards are written for specific situations. NEC applies ONLY to premises wiring, and to some extent, to wiring connected to premises wiring (like a standby generator, or an accessory building, like a garage powered from the same service). It does NOT apply to vehicles, or boats, or to the power company's wiring outside the premises. When Standards and Codes are written, very smart and experienced engineers cogitate and discuss all the possible implications of the requirements of the proposed standard, trying very hard to consider how the system would react to any of the myriad of things that might go wrong, and with serious attention both to how things are done in the real world, and to the laws of physics.For about ten years, I've been a part of that process as a member of the AES Standards Committee, and am a principal author of all of our published standards on EMC. A typical Standard takes 3-5 years to be conceived, written, and adopted. I have a great deal of respect for my colleagues, and others who do this, and for the resulting standards and codes. 73, Jim Brown K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
