I will confer with my electrician as I just had major electrical upgrade completed in January. I was planning to get a dedicated 240V line installed anyway.
Thanks, Keith AG6AZ Sent from my iPhone please excuse typos On Dec 12, 2011, at 9:17 AM, "Jim Brown" <[email protected]> wrote: > On 12/12/2011 9:04 AM, "Carl, WCØV" wrote: >> What isn't mentioned is the fact that MOVs are rated by the TOTAL energy >> in Joules that they will absorb in their lifetime before they fail. The >> energy absorbed from spikes is cumulative and when the rating is >> exceeded, boom. >> They are also responsible for nasty noise generated by the crowbar >> action on the spikes in making them square waves - the sum of all >> possible harmonics. I >> used to have to deal with these things when customers would use them >> in front of servoamplifiers. The noise from the square waves drove us >> crazy until we found the MOVs and removed them. > > YES! We learned about this in the pro audio world as well, and did the > same thing to search out and destroy them. And yes, they are insidious, > in everything from copy machines to printers and even power supplies. I > found some in an Astron power supply when they failed. > > The WORST thing about MOV-based protectors is that they CAUSE > destructive failures of equipment that is interconnected by low voltage > wiring when that equipment is plugged into different power outlets, even > when all of the outlets are "protected." That's because they dump the > surge into the green wire that serves each outlet, the length, and thus > the voltage drop due to the surge to each outlet is different, and the > DIFFERENCE blows up the equipment. That's why MOVs are ONLY a good > thing at the service entrance. > > 73, Jim Brown K9YC > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
