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Making your own fuseable links

 
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JOHN TIPTON



Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

PostPosted: Wed Jul 11, 2018 8:32 am    Post subject: Making your own fuseable links Reply with quote

Hi Guys

Where can you get the 'SILICONE COVERED FIBREGLASS SLEEVING' to make your own fuseable links

Regard: John


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nuckolls.bob(at)aeroelect
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PostPosted: Wed Jul 11, 2018 10:33 am    Post subject: Making your own fuseable links Reply with quote

At 11:32 AM 7/11/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>

Hi Guys

Where can you get the 'SILICONE COVERED FIBREGLASS SLEEVING' to make your own fuseable links

Regard: John


https://goo.gl/uuWsgi

Where are you using a fusible link?



Bob . . .


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JOHN TIPTON



Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

PostPosted: Thu Jul 12, 2018 1:58 am    Post subject: Re: Making your own fuseable links Reply with quote

Hi Bob

Your answer relates to the Z11 wiring we are using: specifically the Endurance Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus.

We are doing without the the main Battery Bus as not required, now this leaves us without the 7 amp protection, so I was going to put a 'fusible link' at the Battery Contactor - incidently we are using 14AWG (because we have it, we do not have any 16AWG).

I need to make up a 18AWG fusible Link

John


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PostPosted: Thu Jul 12, 2018 4:55 am    Post subject: Making your own fuseable links Reply with quote

At 04:58 AM 7/12/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>

Hi Bob

Your answer relates to the Z11 wiring we are using: specifically the Endurance Bus feed, the diagram shows a live feed to a Fuse Block (Main Battery Bus), then a 7 amp fuse to the Endurance Buss switch, then to to Endurance Bus.

We are doing without the the main Battery Bus as not required, now this leaves us without the 7 amp protection, so I was going to put a 'fusible link' at the Battery Contactor - incidently we are using 14AWG (because we have it, we do not have any 16AWG).

I need to make up a 18AWG fusible Link

I'd just move the 30A in-line alternate feed
fuseholder over to the battery, eliminate
the battery bus, mount the alternate feed
relay adjacent to the battery contactor.

Use the in-line fuseholder to 'jumper'
between the alternate feed relay and
battery contactor.



Bob . . .


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JOHN TIPTON



Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

PostPosted: Thu Jul 12, 2018 9:48 am    Post subject: Re: Making your own fuseable links Reply with quote

Hi Bob

It's obvious that I do not have the latest version of Z11 (mine being rev:M) as the drawing does not include any '30A in-line alternate feed
fuseholder' or the 'alternate feed relay' which you mention.

What 'revision' are we on now and can you give me a link please

Regards: John


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user9253



Joined: 28 Mar 2008
Posts: 1263
Location: Riley TWP Michigan

PostPosted: Thu Jul 12, 2018 11:20 am    Post subject: Re: Making your own fuseable links Reply with quote

Here is a link to Bob's electrical drawings.
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/


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JOHN TIPTON



Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England

PostPosted: Fri Jul 13, 2018 4:19 am    Post subject: Re: Making your own fuseable links Reply with quote

Hi Bob

I can see where we are now with Z11 rev: P (thank you user9253-Joe Gores for the link), I'm sticking with Rev: M (no 30 amp in-line fuse or or E-Bus alternate feed relay) - so it's a fusible link off the live side of the Battery contactor

Regards: John


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PostPosted: Fri Jul 13, 2018 5:50 am    Post subject: Making your own fuseable links Reply with quote

At 07:19 AM 7/13/2018, you wrote:
Quote:
--> AeroElectric-List message posted by: "JOHN TIPTON" <jmtipton(at)btopenworld.com>

Hi Bob

I can see where we are now with Z11 rev: P (thank you user9253-Joe Gores for the link), I'm sticking with Rev: M (no 30 amp in-line fuse or or E-Bus alternate feed relay) - so it's a fusible link off the live side of the Battery contactor

Regards: John



Wouldn't do that myself but as you wish . . .


Bob . . .


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PostPosted: Fri Jul 13, 2018 12:33 pm    Post subject: Making your own fuseable links Reply with quote

Quote:

Wouldn't do that myself but as you wish . . .

Got a private email seeking clarification of what
was correctly perceived as a terse reply. My
apologies.

Recall that the legacy 'rule of thumb' for always
hot feeders in TC aircraft suggested they
be protected at not more than 5A. This HAD to
be a rule of thumb . . . cause the 5A figure
was a constant whether we were talking about
28 vs. 14v and breakers vs. fuses.

I've asked if analysis was offered for mitigating
potential energy dissipation that drove
the 5A figure . . . nobody I knew was aware of
any such study.

Nonetheless, FMEA deliberations confirmed the
notion that such wires SHOULD be of some limited
ability to conduct post-crash energy.
So for the Z-figures, we adopted 7A in fuses
and 5A in breakers in 14v systems.

The 7A fuse seemed to give good coverage for
most boost pumps and electronic ignition systems
of the time. A little later on, the Endurance
Bus came along. At that time, it was possible
to craft an endurance load that did not exceed
the 7A-rule for always hot feeders.

At some later time, Z-13/8 came along which offered
an opportunity to support e-bus/battery bus loads
up to and including 10A. We also had builders
wanting to support e-bus loads in excess of 10A.

At this time, the e-bus alternate feed relay was
added to become a mini-battery contactor that supported
only e-bus loads. At that time, protection of that
feed path was boosted to 15A . . . and COULD be
larger still.

This because crash safety for the feed path
changed from ALWAYS HOT protected at 7A to
CREW CONTROLLED with no practical limit.



[img]cid:.0[/img]


If one does not require a battery bus
but with 'larger' e-bus loads, then the alternate
feed relay is still recommended. The relay
is mounted close to the battery contactor
hence a short jumper between the two devices.
That jumper is easily fabricated with an
in-line fuse holder. the in-line fuse is MANY
times faster than a fusible link.

As we've discussed quite a few times over the
years, fusible links behave more like current
limiters . . . very slow compared to fuses.
They are not recommended for in situations
other than those illustrated in the Z-figures.


Bob . . .


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