---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 05/10/08: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:02 PM - Re: Z-19 Item Clarification (Mark Sletten) ________________________________ Message 1 _____________________________________ Time: 08:02:02 PM PST US Subject: AeroElectric-List: Re: Z-19 Item Clarification From: "Mark Sletten" sshook(at)cox.net wrote: > I hear what you are saying with the 4P3T switch. I just don't see any other alternatives to switching bus power while still staying within the recommendations/requirements of Eggenfellner. I've read the Eggenfellner install manual. There IS a schematic depicting what the manual refers to as "one way to wire your system" using the switch to which you refer. I couldn't find anything stating the switch as a "requirement." As far as I can see, the ONLY benefit this switch provides is the ability to switch between power supplies with a single switch. Other than the drawing in the manual, which specific recommendation(s) from Eggenfellner require you to incorporate a single point of failure in your electrical system? Maybe a better question might be how has Eggenfellner justified the recommendation(s) you feel compelled to follow? sshook(at)cox.net wrote: > Eventually, all roads in our redundant electrical systems lead to a single point of failure - the power wire for the component we are powering. That will always be a single point of failure as I do not know of many components that have independent, redundant power sources. Comparing a single, unbroken wire connected at either end with a switch incorporating 12 external connecting points and a multitude of moving parts manipulating several internal contacts is a bit of a stretch... Even if you are convinced of the invincibility of the switch, what design philosophy drives connecting both fuel pumps to a single pole of the switch? Regards, -------- Mark Sletten Legacy FG N828LM http://www.legacyfgbuilder.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=182437#182437 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.