Today's Message Index:
----------------------
1. 06:53 AM - Re: Ground Loop posibilities (Angier M. Ames)
2. 06:53 AM - Re: Ground Loop posibilities (Angier M. Ames)
3. 08:21 AM - Welding cable (rvg8tor)
4. 09:55 AM - Re: Welding cable (Sam Hoskins)
5. 12:25 PM - Re: Welding cable (Robert L. Nuckolls, III)
6. 03:31 PM - Diode numbers (rvg8tor)
7. 04:05 PM - Re: Welding cable (Robert L. Nuckolls, III)
8. 05:43 PM - Re: Welding cable (rvg8tor)
Message 1
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| Subject: | Re: Ground Loop posibilities |
In my Lancair, I have two Odessey batteries and the - terminals are
wired as follows:
1. 4ga cable from A bat to B bat and from there to starter ground.
2. 10ga cable from A Bat to B Bat and from there to ground buss
forward of the panel. This ground buss is
electrically isolated from the rest of the airframe as it is mounted
on glass.
I can demonstrate continuity between the ground buss and any point on
the instrument panel and avionics stack as well as any of the control
cables which penetrate the firewall and attach to the engine. This
would seem to be made possible by the ground path from the batteries
directly to the starter ground point. From a ground loop point of
view, is this anything to be concerned about? Given all the cables
which attach to the engine and pass through the firewall to the panel,
I don't see how it would be possible to isolate the starter ground
cable path to the panel. Maybe this is a non issue and I should just
get on with building.
All comments appreciated. :-)
Angier Ames
N4ZQ
Message 2
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| Subject: | Re: Ground Loop posibilities |
In my Lancair, I have two Odessey batteries and the - terminals are
wired as follows:
1. 4ga cable from A bat to B bat and from there to starter ground.
2. 10ga cable from A Bat to B Bat and from there to ground buss
forward of the panel. This ground buss is
electrically isolated from the rest of the airframe as it is mounted
on glass.
I can demonstrate continuity between the ground buss and any point on
the instrument panel and avionics stack as well as any of the control
cables which penetrate the firewall and attach to the engine. This
would seem to be made possible by the ground path from the batteries
directly to the starter ground point. From a ground loop point of
view, is this anything to be concerned about? Given all the cables
which attach to the engine and pass through the firewall to the panel,
I don't see how it would be possible to isolate the starter ground
cable path to the panel. Maybe this is a non issue and I should just
get on with building.
All comments appreciated. :-)
Angier Ames
N4ZQ
Message 3
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My van's kit came with MS 2 awg cable for big wires, but the stuff is too stiff
for my application, I have very short runs from my battery to the contactor.
I know welding cable can be used, a friend found some "200 amp inverter cable"
at Harbor Freight that he is using in his airplane. Does anyone know if this
is the same stuff as welding cable. The connections I want to use this flexible
cable for are all behind the firewall, I will use the mil spec stuff to run
power forward to the starter. Thanks for any help with this.
--------
Mike "Nemo" Elliott
RV-8A QB (Fuselage)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=264699#264699
Message 4
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| Subject: | Re: Welding cable |
I don't know about the Harbor Freight stuff, but when I was looking for
welding cable, I did find a variety of quality in insulation. Some had an
inner jacket, which I took to be a better quality, and some had not.
Sam
www.samhoskins.blogspot.com
On Thu, Sep 24, 2009 at 10:19 AM, rvg8tor <rvg8tor@comcast.net> wrote:
>
> My van's kit came with MS 2 awg cable for big wires, but the stuff is too
> stiff for my application, I have very short runs from my battery to the
> contactor. I know welding cable can be used, a friend found some "200 amp
> inverter cable" at Harbor Freight that he is using in his airplane. Does
> anyone know if this is the same stuff as welding cable. The connections I
> want to use this flexible cable for are all behind the firewall, I will use
> the mil spec stuff to run power forward to the starter. Thanks for any help
> with this.
>
> --------
> Mike "Nemo" Elliott
> RV-8A QB (Fuselage)
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=264699#264699
>
>
Message 5
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| Subject: | Re: Welding cable |
At 10:19 AM 9/24/2009, you wrote:
>
>My van's kit came with MS 2 awg cable for big wires, but the stuff
>is too stiff for my application, I have very short runs from my
>battery to the contactor. I know welding cable can be used, a
>friend found some "200 amp inverter cable" at Harbor Freight that he
>is using in his airplane. Does anyone know if this is the same
>stuff as welding cable. The connections I want to use this flexible
>cable for are all behind the firewall, I will use the mil spec stuff
>to run power forward to the starter. Thanks for any help with this.
No good way to know details of this product.
Welding cable is really inexpensive. Pick up
what you need at a local welding supply store.
Also, 2AWG is REALLY oversized for an RV with battery
on the firewall. If it were my airplane, 4AWG
welding cable would be used for all fat wires
that carry starter current.
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 6
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I have an electronic supply store in my town so I went out to get the diodes that
go on the battery and start relays. I asked for the 1N5400, after looking
up in a book the guy gave me an NTE-5800. Near as I can tell from looking on-line
they are the same type of diode. Is there anything quality wiser or otherwise
I should be aware of when buying these things? They only cost .38 each,
so after ring terminals and some heat shrink I might have a buck into them,
not bad.
--------
Mike "Nemo" Elliott
RV-8A QB (Fuselage)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=264814#264814
Message 7
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| Subject: | Re: Welding cable |
At 11:51 AM 9/24/2009, you wrote:
>I don't know about the Harbor Freight stuff, but when I was looking
>for welding cable, I did find a variety of quality in
>insulation. Some had an inner jacket, which I took to be a better
>quality, and some had not.
>
>Sam
Thanks for reminding me of that Sam. A guy
at a welding store told me that the two-layer
cable lasted longer in the field. Little nicks
in the outer jacket tended to propagate cracks
through to the strands when the cable was flexed/
stretched. By making it two layers, the gap
was a "crack stopper" while the inner layer
maintained environmental integrity.
http://aeroelectric.com/Pictures/Wire/4AWG_Welding_Cable_1.jpg
It seems a logical explanation. Of course,
the cables in our airplanes don't get stretched
across gravel drives and run over by dump-trucks.
The Anchor brand welding cable illustrated above
has an HDPM outer jacket which is revered for
its flexibility and toughness. Here's an excerpt
from a wire catalog describing this insulation.
Emacs!
Bob . . .
---------------------------------------
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
---------------------------------------
Message 8
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| Subject: | Re: Welding cable |
I found my local welding shop and bought some 4 AWG. Man this stuff is flexible,
I can't believe I was trying to wrestle with the mill spec stuff for those
short runs. It is not the double insulated stuff you showed in the picture but
it seem tough. it is labeled as "Heavy Duty Welding cable 600V -50 degrees C
to 105 degrees C. I will use a crimp on ring terminal, I have the tool from
ACS for this but should I solder the end before crimping, there are a lot of fine
wires in this cable. I will have to check the AEC Bible, I seem to remember
reading something on this subject.
--------
Mike "Nemo" Elliott
RV-8A QB (Fuselage)
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=264836#264836
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