Today's Message Index:
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1. 05:48 AM - Re: Re: fuses in series (Robert L. Nuckolls, III)
2. 06:01 AM - Re: Re: fuses in series (Matthew Whiting)
Message 1
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| Subject: | Re: fuses in series |
At 09:18 PM 2/23/2023, you wrote:
>
>Theories need to be proven by experimenting and testing.
>Dan's testing shows that it is OK to have fuses in series.
>On the other hand, why take a chance on the main fuse blowing when
>there are are alternatives?
What FMEA conditions ever suggest that fuses
in series are a good and necessary thing?
I've read several narratives where the writer
talks about a "main" breaker . . . and I cannot
imagine what they're talking about or just how
such a device became a part of his/her
airplane.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
Message 2
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| Subject: | Re: fuses in series |
I could see someone following the architecture used in home and building
electrical distribution systems where series fuses/breakers are very
common. Electric utilities have fuses on their distribution lines.
Most buildings have a main breaker on the incoming service. And then
each circuit has a breaker. And finally many end devices have their own
internal fuses or breakers. So, fuses/breakers in series are common in
many applications.
I don=99t recall seeing that in a vehicle though, although I think
my new Equinox does have a fuse on the main positive battery lead, which
is a first.
Why would one not want to have a fuse on the main battery lead to
protect a short of the battery cable? I know this isn=99t common,
but I also have seen battery cables contact ground a few times and the
results are generally fairly impressive. Is the issue just one of not
wanting an additional point of failure? Or the cost of a large fuse and
fuse holder?
Regards,
Matt
> On Feb 24, 2023, at 8:47 AM, Robert L. Nuckolls, III
<nuckolls.bob@aeroelectric.com> wrote:
>
> At 09:18 PM 2/23/2023, you wrote:
<fransew@gmail.com>
>>
>> Theories need to be proven by experimenting and testing.
>> Dan's testing shows that it is OK to have fuses in series.
>> On the other hand, why take a chance on the main fuse blowing when
there are are alternatives?
>
>
> What FMEA conditions ever suggest that fuses
> in series are a good and necessary thing?
>
> I've read several narratives where the writer
> talks about a "main" breaker . . . and I cannot
> imagine what they're talking about or just how
> such a device became a part of his/her
> airplane.
>
>
> 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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