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david(at)carter.net
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 Posted: Sat Jun 06, 2020 4:38 am Post subject: Physical construction of Z101 engine bus & battery bus |
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Bob,
I see that both of these busses are specified with 6" max feeds from their sources (main contactor and diode bridge). What is the recommended physical realization of these bus designs? Fuse blocks on the engine side of the firewall? Inline fuses? Are the loads intended to be fused, breakered, or a mix? Similarly, what is the suggested construction of the "fat wire tie point?"
In my case, I believe everything on the engine bus will be on the cabin side of the firewall - an AFP fuel pump & two SDS CPI-2 ignition control units. I could perhaps put a pair of 6" 12 AWG wires through the firewall at the contactor & mount a fuse block on the cabin side at that point.
The battery bus may be only a single connection to the aux alternator, or I may find that I need a clock feed. If it's just a single feed, the bus construction doesn't get any simpler. BTW, I just noticed there are two feeds on the battery bus labeled "aux alt".
Also, I note that the alt feed from the relay to the engine bus is not asterisked as a short run. I think practically it will be, but I wonder if there is a reason it's not asterisked?
Thanks!
---
David Carter
david(at)carter.net (david(at)carter.net)
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user9253
Joined: 28 Mar 2008
Posts: 1922
Location: Riley TWP Michigan
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| Posted: Sat Jun 06, 2020 4:59 pm Post subject: Re: Physical construction of Z101 engine bus & battery b |
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Since bob gave permission to others to answer, here are my suggestions:
Mount both relays as close as practical to the battery.
Doing that meets the 6" wire length rule of thumb.
Since you want the engine bus located on the cabin side of the firewall, also
move the diode bridge to aft of the firewall between the main power bus and the engine bus.
Move the diode feed from the main battery contactor to main power bus. Electrically it will be the
same, just connected to the other end of the 6AWG feeder.
Since there are only 2 items connected to the battery bus, consider eliminating the battery bus.
Connect both items to the battery post using inline fuses.
Use all fuses except for the alternator feed 5 amp breaker.
Fuses cost less, weigh less, and never fail to blow when required.
Never replace fuses or reset breakers in flight, except perhaps the alternator field.
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