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1. 08:47 AM - Re: Re: Too many Circuit breakers.... (Robert L. Nuckolls, III)
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| Subject: | Re: Too many Circuit breakers.... |
At 09:48 AM 8/21/2022, you wrote:
>
>Bob, et al.,
>
>Finally have all of the parts and pieces for the upgrade - new panel
>wiring is almost complete and ready to haul out to the airport for
>the install. Decided to bite the bullet and do the SD-8 right away -
>need to order this week. It will be a backup only per Z101B.
good move
>Question, as the wiring diagrams I'm seeing from BandC doesn't
>answer some questions... Basic SD-8 with the PMR1C-14... Just two
>wires coming of the SD-8 - connect to the two blue wires on the PMR1C-14.
yes
> Black wire on the PMR1C-14 to engine case ground?
System ground . . . forest of tabs on firewall?
> Red wire via the Aux Alt switch (Carling 2GG51-73 15 Amp switch)
> to the fat wire tie point with a fusible link at the fat wire tie
point?
yes
>Any need for crowbar / overvoltage protection with the SD-8 against
>a PC680 battery when used for emergency use only?
Probably not
>Do you consider having the battery and both alternators per the
>Z101B configuration sufficient redundancy for a dual electronic
>ignition aircraft? (ignition optionally fed from either side of the master.)
I would wire per z101 wherein engine bus enjoys
two, independent feed paths.
>I am considering running the SD-8 output also to one of my ignitions
>(third switch position on the ignition - EMER) such that if there's
>a hard short and I lose the entire electrical system, the SD-8 can
>feed one ignition. Dark and stormy night - electrical system goes
>dark along with the engine - flip Ign2 to EMER.
How are you going to get a 'hard fault' on the engine bus?
Hard faults in electrical systems are invariably results
of (1) poor craftsmanship or (2) really catastrophic
distortions of the airplane (like flying into mountainside).
Pay attention to wire security and clearance from
moving parts . . . don't worry about that dark-n-stormy
night scenario.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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