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1. 08:02 PM - Re: Z-19 Item Clarification (Mark Sletten)
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| Subject: | Re: Z-19 Item Clarification |
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
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