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3 conductor AWG18 cable

 
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michele.delsol(at)microsi
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PostPosted: Tue Jan 24, 2006 11:25 pm    Post subject: 3 conductor AWG18 cable Reply with quote

I am looking for 3 conductor AWG18 cable to hook up the strobe lights.
Steinair does not have it =96 does any one have a thought on a source for
this?

Thanks,

Michele

RV8 fuselage


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Bruce(at)glasair.org
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PostPosted: Tue Jan 24, 2006 11:41 pm    Post subject: 3 conductor AWG18 cable Reply with quote

Wheelen Install kit.

Bruce
www.glasair.org


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rv8ch



Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

PostPosted: Wed Jan 25, 2006 12:33 am    Post subject: 3 conductor AWG18 cable Reply with quote

These guys have it:

http://www.strobesnmore.com/

Mickey

Michle Delsol wrote:
Quote:


I am looking for 3 conductor AWG18 cable to hook up the strobe lights.
Steinair does not have it =96 does any one have a thought on a source for
this?



Thanks,

Michele

RV8 fuselage



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Mickey Coggins
http://www.rv8.ch/
#82007 finishing
do not archive


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jmfpublic(at)comcast.net
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PostPosted: Thu Jan 26, 2006 12:28 am    Post subject: 3 conductor AWG18 cable Reply with quote

Michele asked:

I am looking for 3 conductor AWG18 cable to hook up the strobe lights.
Steinair does not have it Does any one have a thought on a source for
this?

This was discussed one or two years ago. I don't recall the numbers, but the losses from using 22 gauge wire, which is much lighter, and available from Steinair, are quite acceptable. I'm using 22 gauge three conductor shield wire for my Whelen strobes, and expect no problem. I was very impressed at the weight of the shielded 18 gauge supplied by Whelen. The 22 gauge, needing a smaller shield, is much lighter. Search the archive if you truly believe that 18 gauge is needed.

Jim Foerster, jmfpublic(at)comcast_dot_net Jabiru J400 wiring


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michele.delsol(at)microsi
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PostPosted: Thu Jan 26, 2006 2:02 am    Post subject: 3 conductor AWG18 cable Reply with quote

I should have been a little more specific - my question related to feeding
the power supply and synching three strobes together. Since the current is
not steady I prefer to shield the feed lines - 4 amps on 18awg should be OK.
On the strobe light side, since we are dealing with 400V or so, amperage is
very low and transient so 22awg should be OK.

Michle

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brian



Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

PostPosted: Thu Jan 26, 2006 7:46 am    Post subject: 3 conductor AWG18 cable Reply with quote

Michle Delsol wrote:
Quote:


I should have been a little more specific - my question related to feeding
the power supply and synching three strobes together. Since the current is
not steady I prefer to shield the feed lines - 4 amps on 18awg should be OK.
On the strobe light side, since we are dealing with 400V or so, amperage is
very low and transient so 22awg should be OK.

Actually, amperage is very high on the HV side because you are
discharging a capacitor through a virtual dead short (the ionized gas in
the flash tube). The pulse is fairly short so the average current is low
but the peak is quite high. Use a heavier wire.

Also, shielding won't help you much. The high-current pulse will produce
one heck of a magnetic field on the wire which the non-magnetic
shielding won't do anything to stop. The best thing to do is to make
sure that the return (ground) wire is parallel to and closely bound to
the HV wire. The magnetic fields will be equal and opposite and will
cancel each other out. That is all the shielding you need.

As for the synchronization between the power supplies, those pulses are
low-voltage, low-current signals between the power supply boxes. You
don't really need a heavy wire there.

--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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rv8ch



Joined: 10 Jan 2006
Posts: 250
Location: Switzerland

PostPosted: Thu Jan 26, 2006 9:54 am    Post subject: 3 conductor AWG18 cable Reply with quote

Quote:
Also, shielding won't help you much. The high-current pulse will produce
one heck of a magnetic field on the wire which the non-magnetic
shielding won't do anything to stop. The best thing to do is to make
sure that the return (ground) wire is parallel to and closely bound to
the HV wire. The magnetic fields will be equal and opposite and will
cancel each other out. That is all the shielding you need.

Great info. The strobe wires I have, which came with the strobe
kit, have three wires, and the whole bundle is shielded. I imagine
one wire is a ground, and one of the other two must be the HV wire,
but any idea what the third would be? Just curious.

Thanks,
Mickey

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http://www.rv8.ch/
#82007 finishing
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nuckollsr(at)cox.net
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PostPosted: Thu Jan 26, 2006 3:03 pm    Post subject: 3 conductor AWG18 cable Reply with quote

At 06:53 PM 1/26/2006 +0100, you wrote:

Quote:

<mick-matronics(at)rv8.ch>

> Also, shielding won't help you much. The high-current pulse will produce
> one heck of a magnetic field on the wire which the non-magnetic
> shielding won't do anything to stop. The best thing to do is to make
> sure that the return (ground) wire is parallel to and closely bound to
> the HV wire. The magnetic fields will be equal and opposite and will
> cancel each other out. That is all the shielding you need.

Great info. The strobe wires I have, which came with the strobe
kit, have three wires, and the whole bundle is shielded. I imagine
one wire is a ground, and one of the other two must be the HV wire,
but any idea what the third would be? Just curious.

Ground, HV out to tube, trigger voltage to fire it.
See Figure 12-4 in the 'Connection . . .

Bob . . .


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Bill Denton



Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA

PostPosted: Thu Jan 26, 2006 3:17 pm    Post subject: 3 conductor AWG18 cable Reply with quote

Don't know if it's relevant, but Whelen now sells combined
strobe/nav/position lights, run off a single, typically fuselage-mounted,
strobe controller. They just use one shielded cable out to the wing tips,
with conductors for both the strobes and the nav/position lights.

Is it possible that you have some of that cable?


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Bruce(at)glasair.org
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PostPosted: Thu Jan 26, 2006 3:53 pm    Post subject: 3 conductor AWG18 cable Reply with quote

Whelen literature calls it , Anode, Cathode, and Trigger.

Bruce
www.glasair.org


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brian



Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

PostPosted: Thu Jan 26, 2006 4:52 pm    Post subject: 3 conductor AWG18 cable Reply with quote

Mickey Coggins wrote:

Quote:
Great info. The strobe wires I have, which came with the strobe
kit, have three wires, and the whole bundle is shielded. I imagine
one wire is a ground, and one of the other two must be the HV wire,
but any idea what the third would be? Just curious.

There is ground, B+ (about 400V), and trigger. The trigger is a very low
current but high voltage (about 3000V) to give the xenon in the tube a
"kick" to start it ionizing. Once that happens the capacitor on the
+400V line discharges through the tube until there is (virtually)
nothing left in the capacitor. At that point the tube winks out and the
capacitor charges again. When it comes time for the flashtube to light
off again, the power supply sends out the 3000V pulse on the trigger
line and the cycle starts all over again.

--
Brian Lloyd 2243 Cattle Dr.
brian-yak at lloyd dot com Folsom, CA 95630
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery


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