Kris, I think you need to read the initial and follow up postings.
It is thought that if either the normally used white outlet and/or unused RED outlet were not in use at the time of the lightning strike it would not have tripped their breaker. So it is thought if the breaker that was to the outlet was in use and got hit and braker tripped then something would switch over to the other unused RED emergency powered outlet. If lightning did hit the relay or anything else it will do as it wants. The posting of using a UPS after a relay switch appeals to me. This way when there was switching between the sources the UPS could buffer the short loss of power and the repeaters and other equipment would not see a change. Also the UPS would have to maintain power for short period of time and could be lower VA unit, possible 500 VA. Most UPSs have surge and some lightning protection. 73, ron, n9ee/r >From: Kris Kirby <[EMAIL PROTECTED]> >Date: 2008/07/14 Mon AM 11:41:00 EDT >To: [email protected] >Subject: Re: [Repeater-Builder] Re: Switching a Repeater Betwen AC Sources > >On Mon, 14 Jul 2008, Laryn Lohman wrote: >> The reason we would not want to be on the red receptacle normally is >> that in case of a lightning strike we are potentially left with a dead >> red from the strike, and dead white if the utility is down. Obviously, >> another strike, after we've switched to the red, kills AC totally to >> our stuff. The presumption is that a breaker probably won't trip, >> even after a strike, if there's not a load of some sort on it to >> complete a path for the "tripping" current. Make sense? > >We're talking about an ionized channel of electrons that can cross >hundreds of feet vertically, and still generate smaller channels within >the radio shed that can jump a foot or more. Do you really think that a >3PDT relay with contacts one quarter of an inch apart represents an >obstacle for this immense charge of electricity? I understand that you >want to get it back on the air yesterday, but unless you've implemented >a lightning arrestor on every bloody port of every bloody device, I >wouldn't bet that you could keep the breaker from tripping. > >-- >Kris Kirby, KE4AHR <[EMAIL PROTECTED]> >But remember, with no superpowers comes no responsibility. > --rly > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
