Today's Message Index:
----------------------
1. 04:59 AM - Re: Ground wire for LED lights (Carlos Trigo)
2. 05:48 AM - Re: Ground wire for LED lights (Peter Pengilly)
3. 06:37 AM - Re: Ground wire for LED lights (Kelly McMullen)
4. 07:27 AM - Re: Ground wire for LED lights (C&K)
5. 07:40 AM - Re: Ground wire for LED lights (Carlos Trigo)
6. 08:17 AM - Re: Ground wire for LED lights (Robert L. Nuckolls, III)
7. 10:22 AM - Re: Ground wire for LED lights (Robert L. Nuckolls, III)
8. 01:25 PM - Re: Ground wire for LED lights (Kelly McMullen)
9. 08:05 PM - Re: Ground wire for LED lights (Rick Beebe)
10. 08:12 PM - Re: Ground wire for LED lights (Kelly McMullen)
Message 1
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| Subject: | Re: Ground wire for LED lights |
Sounds fair enough
Carlos
Enviado do meu iPhone
No dia 03/11/2017, =C3-s 23:29, gwgregory <gwgregory@comcast.net> escreveu
:
> I am installing AeroLed nav/strobe and landing lights in the wingtips of m
y Kitfox. Rather than rely upon a ground path through the wing spars and fus
elage structure, I plan to install a ground wire from each wingtip direct to
my main ground point. The loads are listed as 0.5 for nav, 3.0 for strobe a
nd 2.2 for landing lights. Wire length would be about 25 feet. Since the str
obe load is intermittent, I'm thinking 18 AWG will be sufficient. Sound good
, or not?
>
>
> Sent from my Galaxy Tab=C2=AE S2
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| Subject: | Ground wire for LED lights |
Can you class the strobe load as intermittent? The current draw is
certainly not a steady value, but the mean draw might be 1 or 1.5A? Even
so, 4A for 18g over 25=99 is on the edge of what the tables
suggest is acceptable, 16AWG might be a better bet. How often, and for
how long will you use the landing lights? Is this ground wire bundled
with the supply wires?
Peter
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
gwgregory
Sent: 03 November 2017 23:29
Subject: AeroElectric-List: Ground wire for LED lights
I am installing AeroLed nav/strobe and landing lights in the wingtips of
my Kitfox. Rather than rely upon a ground path through the wing spars
and fuselage structure, I plan to install a ground wire from each
wingtip direct to my main ground point. The loads are listed as 0.5 for
nav, 3.0 for strobe and 2.2 for landing lights. Wire length would be
about 25 feet. Since the strobe load is intermittent, I'm thinking 18
AWG will be sufficient. Sound good, or not?
Sent from my Galaxy Tab=C2=AE S2
Message 3
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| Subject: | Re: Ground wire for LED lights |
My question is what do you expect to gain by using a separate wire for
ground? I seriously doubt it will make a bit of difference for audio
noise to your audio panel/com radio. Seems like a lot of effort to
accomplish very little. Are you really considering a separate ground
wire for each wing tip? I also think your load analysis makes no sense,
as each wingtip will have half of the load or less, not the whole load.
Your numbers do not match what I see on Aero LEDs web site for current
draw. I assume you are using the Pulsar NSP units with no separate tail
light. Aero LEDs offers 20AWG wire to power the nav/strobe lights. The
nav/strobe combos use #20 wire for ground coming out of the unit.
The landing lights are shown at 3.2 amps on their install pdf.
If it makes you feel better, I would use 20 AWG wire for the nav/strobe
units ground back to the central ground. I definitely would not run
ground of landing lights back to central ground, just ground locally.
Kelly
On 11/4/2017 5:46 AM, Peter Pengilly wrote:
> Can you class the strobe load as intermittent? The current draw is
> certainly not a steady value, but the mean draw might be 1 or 1.5A? Even
> so, 4A for 18g over 25 is on the edge of what the tables suggest is
> acceptable, 16AWG might be a better bet. How often, and for how long
> will you use the landing lights? Is this ground wire bundled with the
> supply wires?
>
> Peter
>
> *From:*owner-aeroelectric-list-server@matronics.com
> [mailto:owner-aeroelectric-list-server@matronics.com] *On Behalf Of
> *gwgregory
> *Sent:* 03 November 2017 23:29
> *To:* aeroelectric-list@matronics.com
> *Subject:* AeroElectric-List: Ground wire for LED lights
>
> I am installing AeroLed nav/strobe and landing lights in the wingtips of
> my Kitfox. Rather than rely upon a ground path through the wing spars
> and fuselage structure, I plan to install a ground wire from each
> wingtip direct to my main ground point. The loads are listed as 0.5 for
> nav, 3.0 for strobe and 2.2 for landing lights. Wire length would be
> about 25 feet. Since the strobe load is intermittent, I'm thinking 18
> AWG will be sufficient. Sound good, or not?
>
> Sent from my Galaxy Tab S2
>
Message 4
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| Subject: | Re: Ground wire for LED lights |
I ran #18 to the wingtips.
I wanted a spare wire in place anyway and thought it would be available
if needed as a ground in the meantime since I have strobe power packs
and wigwag halogens out there.
I can hear some noise from both those items with the engine off. That's
fine as it reminds me to turn them off and I can't hear them with the
engine running. Trying different ground paths including a local ground
did not seem to make a difference. A spare wire never hurts IMO. Maybe a
wingtip camera in the future, or there are now even options appearing
for wingtip mounted ADDS-B receivers.
Ken
On 03/11/2017 7:29 PM, gwgregory wrote:
> I am installing AeroLed nav/strobe and landing lights in the wingtips
> of my Kitfox. Rather than rely upon a ground path through the wing
> spars and fuselage structure, I plan to install a ground wire from
> each wingtip direct to my main ground point. The loads are listed as
> 0.5 for nav, 3.0 for strobe and 2.2 for landing lights. Wire length
> would be about 25 feet. Since the strobe load is intermittent, I'm
> thinking 18 AWG will be sufficient. Sound good, or not?
>
>
> Sent from my Galaxy Tab S2
Message 5
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| Subject: | Re: Ground wire for LED lights |
Kelly
>From a long time weve been told by the experts that using a separate wire for
ground, thus avoiding the ground path through the airplane structure, will certainly
guarantee that no ground loop occurs, thus avoiding audio noise.
Would you explain why this isnt correct?
Thanks
Carlos
Enviado do meu iPhone
No dia 04/11/2017, s 13:35, Kelly McMullen <kellym@aviating.com> escreveu:
>
> My question is what do you expect to gain by using a separate wire for ground?
I seriously doubt it will make a bit of difference for audio noise to your audio
panel/com radio. Seems like a lot of effort to accomplish very little. Are
you really considering a separate ground wire for each wing tip? I also think
your load analysis makes no sense, as each wingtip will have half of the load
or less, not the whole load.
> Your numbers do not match what I see on Aero LEDs web site for current draw.
I assume you are using the Pulsar NSP units with no separate tail light. Aero
LEDs offers 20AWG wire to power the nav/strobe lights. The nav/strobe combos
use #20 wire for ground coming out of the unit.
> The landing lights are shown at 3.2 amps on their install pdf.
> If it makes you feel better, I would use 20 AWG wire for the nav/strobe units
ground back to the central ground. I definitely would not run ground of landing
lights back to central ground, just ground locally.
> Kelly
>
>> On 11/4/2017 5:46 AM, Peter Pengilly wrote:
>> Can you class the strobe load as intermittent? The current draw is certainly
not a steady value, but the mean draw might be 1 or 1.5A? Even so, 4A for 18g
over 25 is on the edge of what the tables suggest is acceptable, 16AWG might
be a better bet. How often, and for how long will you use the landing lights?
Is this ground wire bundled with the supply wires?
>> Peter
>> *From:*owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] *On Behalf Of *gwgregory
>> *Sent:* 03 November 2017 23:29
>> *To:* aeroelectric-list@matronics.com
>> *Subject:* AeroElectric-List: Ground wire for LED lights
>> I am installing AeroLed nav/strobe and landing lights in the wingtips of my
Kitfox. Rather than rely upon a ground path through the wing spars and fuselage
structure, I plan to install a ground wire from each wingtip direct to my main
ground point. The loads are listed as 0.5 for nav, 3.0 for strobe and 2.2 for
landing lights. Wire length would be about 25 feet. Since the strobe load is
intermittent, I'm thinking 18 AWG will be sufficient. Sound good, or not?
>> Sent from my Galaxy Tab S2
>
>
>
Message 6
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| Subject: | Re: Ground wire for LED lights |
At 08:35 AM 11/4/2017, you wrote:
>
>My question is what do you expect to gain by using a separate wire
>for ground? I seriously doubt it will make a bit of difference for
>audio noise to your audio panel/com radio. Seems like a lot of
>effort to accomplish very little. Are you really considering a
>separate ground wire for each wing tip?
Agreed . . . I'd use airframe grounds if
available.
Bob . . .
Message 7
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| Subject: | Re: Ground wire for LED lights |
At 09:38 AM 11/4/2017, you wrote:
<trigo@mail.telepac.pt>
>
>Kelly
>
> >From a long time we=99ve been told by the
> experts that using a separate wire for ground,
> thus avoiding the ground path through the
> airplane structure, will certainly guarantee
> that no ground loop occurs, thus avoiding audio noise.
>
>Would you explain why this isn=99t correct?
Ground induced noises occur when potential
VICTIMS (radios, intercomm, etc) SHARE ground
pathways with potential ANTAGONISTS (alternators,
hydraulic pump motors, xenon strobes, etc.).
The easiest way to avoid the unwanted exchange
of energy is to build a 'ground wall' around
victims. This is what prompted the development
of the panel ground bus illustrated in the
in this document . . .
http://tinyurl.com/ycqp622u
This product is currently not in production
but it's easy to build one.
Bob . . .
Message 8
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| Subject: | Re: Ground wire for LED lights |
What Bob said. Keep avionics grounds, especially audio grounds together,
grounded to single point. Use airframe for big current items and
resistive loads. That assumes that airframe is of a relatively
conductive metal...otherwise, airframes like composites obviously
require wire ground paths.
A few items that are known noise makers, like some varieties of HID
lights need special treatment, as well as xenon strobes, but both those
items are getting replaced in the market by LED.
On 11/4/2017 7:38 AM, Carlos Trigo wrote:
>
> Kelly
>
>>From a long time weve been told by the experts that using a separate wire for
ground, thus avoiding the ground path through the airplane structure, will certainly
guarantee that no ground loop occurs, thus avoiding audio noise.
>
> Would you explain why this isnt correct?
>
> Thanks
> Carlos
>
Message 9
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| Subject: | Re: Ground wire for LED lights |
I agree, but fwiw I can hear my aeroled strobes in my headset. To be
fair I could hear the Whelan strobe they replaced and I re-used the same
wires. At some point I plan to investigate but it's not obnoxious to
make it a priority.
--Rick
On 11/04/2017 04:23 PM, Kelly McMullen wrote:
> <kellym@aviating.com>
>
> What Bob said. Keep avionics grounds, especially audio grounds together,
> grounded to single point. Use airframe for big current items and
> resistive loads. That assumes that airframe is of a relatively
> conductive metal...otherwise, airframes like composites obviously
> require wire ground paths.
> A few items that are known noise makers, like some varieties of HID
> lights need special treatment, as well as xenon strobes, but both those
> items are getting replaced in the market by LED.
Message 10
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| Subject: | Re: Ground wire for LED lights |
Interesting. My Aveo nav/strobe LEDs are perfectly quiet in my Bose A20s.
On 11/4/2017 8:03 PM, Rick Beebe wrote:
>
> I agree, but fwiw I can hear my aeroled strobes in my headset. To be
> fair I could hear the Whelan strobe they replaced and I re-used the same
> wires. At some point I plan to investigate but it's not obnoxious to
> make it a priority.
>
> --Rick
>
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