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roughleg(at)gmail.com
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 Posted: Fri Dec 13, 2019 5:59 pm Post subject: ATO vs ATC fuses |
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Is there a preference for our OBAM aircraft between ATO (housing open at the bottom) and ATC (closed housing) fuses? I can imagine that when a fuse blows some particles of metal might get spewed out of an open housing, but I have no idea if this is the case.
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cluros(at)gmail.com
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| Posted: Fri Dec 13, 2019 6:09 pm Post subject: ATO vs ATC fuses |
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Interesting question. At the same time I'd like to ask if there is any downside to using mini fuses.
On Fri, Dec 13, 2019, 19:04 Pat Little <roughleg(at)gmail.com (roughleg(at)gmail.com)> wrote:
| Quote: | Is there a preference for our OBAM aircraft between ATO (housing open at the bottom) and ATC (closed housing) fuses? I can imagine that when a fuse blows some particles of metal might get spewed out of an open housing, but I have no idea if this is the case.
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nuckolls.bob(at)aeroelect
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| Posted: Sat Dec 14, 2019 11:52 am Post subject: ATO vs ATC fuses |
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At 07:56 PM 12/13/2019, you wrote:
| Quote: | | Is there a preference for our OBAM aircraft between ATO (housing open at the bottom) and ATC (closed housing) fuses? I can imagine that when a fuse blows some particles of metal might get spewed out of an open housing, but I have no idea if this is the case. |
Either is suited to our purposes.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Sat Dec 14, 2019 11:53 am Post subject: ATO vs ATC fuses |
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At 08:07 PM 12/13/2019, you wrote:
| Quote: | | Interesting question. At the same time I'd like to ask if there is any downside to using mini fuses. |
Not aware of any pre-fabricated panels
for the mini fuses. You're looking for ease
of installation and robustness. The fuseblocks
eliminate breaker panels and bus bars while
allowing the distribution to be mounted out
of sight/mind.
Any 'savings' for down-sizing to mini fuses
would be small.
Bob . . .
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cluros(at)gmail.com
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| Posted: Sun Dec 15, 2019 5:37 pm Post subject: ATO vs ATC fuses |
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I like the look and smaller size of the mini fuses and assumed that there would be a plentiful supply of fuse blocks for them but came up empty online. I've seen a couple aircraft with fuse blocks for mini fuses though so they are out there. While looking around I found plenty of marine fuse blocks with ground busses included which seems like a great idea.
https://www.ebay.ca/itm/12V-12-WAY-Fuse-Block-Box-Holder-ATC-ATO-Blade-Garavan-Marine-Dual-Battery-CA/254336429525?hash=item3b37a1edd5:g:A2YAAOSwk8xdEc6G
Unfortunately they are all for fork connectors and I really like the idea of tabs for ease of maintenance under the panel.
Maybe it's time B & C updated their offerings in this area? A fuse block with LEDs to indicate blown fuses with a forest of tabs built in?
On Sat, Dec 14, 2019, 11:58 Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 08:07 PM 12/13/2019, you wrote:
| Quote: | | Interesting question. At the same time I'd like to ask if there is any downside to using mini fuses. |
 Not aware of any pre-fabricated panels
 for the mini fuses. You're looking for ease
 of installation and robustness. The fuseblocks
 eliminate breaker panels and bus bars while
 allowing the distribution to be mounted out
 of sight/mind.
 Any 'savings' for down-sizing to mini fuses
 would be small.
 Bob . . .
|
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nuckolls.bob(at)aeroelect
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| Posted: Sun Dec 15, 2019 6:44 pm Post subject: ATO vs ATC fuses |
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| Quote: | | While looking around I found plenty of marine fuse blocks with ground busses included which seems like a great idea. |
Not recommended . . .
Your system grounds need to be patterned after
Z-15 examples . . . not scattered around on a variety
of fuse blocks.
Bob . . .
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cluros(at)gmail.com
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| Posted: Sun Dec 15, 2019 10:33 pm Post subject: ATO vs ATC fuses |
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Actually Bob Z-15 was what I was thinking of. Each of those fuse blocks has 12 fused power and 12 ground terminals. One block would be the endurance bus / avionics ground bus and the other block would be the main bus / panel ground bus. Although doing it that way I would connect the two ground busses with a braided cable instead of the 5x20awg on the diagram. Why does Z-15 have 5x20awg instead of a bonding strap?
In any case, if I do rewire the plane I think I'll stick to the fuse blocks with tabs instead of screws and a single forest of tabs for the grounds (none of my avionics would need a separate ground bus and I don't have any firewall forward small grounds so only one ground bus).
On Sun, Dec 15, 2019 at 6:49 PM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | | Quote: | | While looking around I found plenty of marine fuse blocks with ground busses included which seems like a great idea. |
 Not recommended . . .
 Your system grounds need to be patterned after
 Z-15 examples . . . not scattered around on a variety
 of fuse blocks.
 Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Dec 16, 2019 8:14 am Post subject: ATO vs ATC fuses |
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At 12:32 AM 12/16/2019, you wrote:
| Quote: | | Actually Bob Z-15 was what I was thinking of. Each of those fuse blocks has 12 fused power and 12 ground terminals. One block would be the endurance bus / avionics ground bus and the other block would be the main bus / panel ground bus. Although doing it that way I would connect the two ground busses with a braided cable instead of the 5x20awg on the diagram. Why does Z-15 have 5x20awg instead of a bonding strap? |
The avionics ground is up on the panel adjacent to
the radios and other electro-whizzies.
http://aeroelectric.com/Pictures/Grounding/AGB_V.jpg
http://aeroelectric.com/Pictures/Grounding/AVG_RA.jpg
since is built up of crimp-on, 20AWG pins, the 5-wire
bundle seems a whole lot cleaner than trying to grab
onto it with anything else. But one could solder a
braided strap to the back-side . . . either works
good and lasts a long time.
| Quote: | | In any case, if I do rewire the plane I think I'll stick to the fuse blocks with tabs instead of screws |
Recommend THREADED TERMINATIONS be avoided
as much as possible. Robustness of small
threaded fasteners are a pain-n-the-uknow-what
to assemble and process sensitive for
longevity and they drive up parts count.
The fast-on is simple, elegant and has an
excellent service record.
| Quote: | | . . . (none of my avionics would need a separate ground bus . . . |
The idea behind the avionics ground is to provide
a LOCAL ground for all panel mounted electro-whizzies
service by a single, robust jumper to airframe system
grounds on firewall.
Bob . . .
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