mprather(at)spro.net
Guest
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 Posted: Thu Oct 19, 2006 4:25 pm Post subject: Acceptable to use thin non aircraft wire to coil |
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Hello Barry,
You might have noticed that Ron was asking about controlling the coil of a
relay with this lightweight wire. The current required for such a task is
likely less than 100mA.. VERY fine wire will handle that much current.
If adequate electrical protection for the wire is provided, there's not
much risk. Running this wire near the headset/mic wiring also probably
won't be much of an issue. Very little current will pass through the
control leads to a relay, so very little noise will be generated. The
items on your list wouldn't be switched at high frequency either, so that
helps too.
Conversely, if you run heavy enough wire to power the strobes up the
switch panel, and the wire is in the same bundle as the mic leads, I think
that might invite headaches.. The other items on the list aren't likely
to be a concern.
I'd say that for the non-critical stuff that Ron listed (all of it), the
most difficult issue is whether he can handle the mechanical end of the
installation.. It can be a real bear to find connectors that work well
with the extremely fine insulated wire. It can also be difficult to
provide adequate strain relief for such wire. As you mentioned, Barry,
abrasion resistance can be tough to address. For a small bundle of wire,
I wouldn't be concerned about smoke factor either. I mean, it's a plastic
airplane..
The other issue I'd mention is parts count. Several more wire connections
to make. Most common relays have moving parts and electrical contacts.
Any of these items can fail. For non-critical systems, it's not a big
deal safety-wise, but it will eventually lead to a higher hassle factor.
It would look pretty cool though.. 
One final thought.. It might be tough to find test data for the proposed
fine wire.. But you can generate your own.. Burn some. Does it support
combustion? How easy is it to damage the insulation by abrasion?
Regards,
Matt-
| Quote: | In a message dated 10/19/2006 1:31:39 PM Eastern Standard Time,
rparigor(at)SUFFOLK.LIB.NY.US writes:
My partner has access to wire that is bout as thick as a model airplane
servo wire. They come in twisted pairs, from 3 pairs on up. It is
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probably
| Quote: | like the twisted wires you see inside computers, like the ones running
fans etc.
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| Quote: |
These wires would be running along side of headphone/mic wiring.
Does this sound acceptable?
Ron Parigoris
===============================
Ron:
I would say NO.
The reasons are:
1 - Cannot handle the current.
Even if the aircraft wire and your wire are the same gage the insulation
cannot handle the current.
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| Quote: |
2 - Abrasion - Aircraft wire has a high resistance to abrasion.
The thin stuff (R/C Servo wire) cannot handle it.
3 - Flammability - The wire you want to use does not meet flammability
requirements.
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| Quote: | It probably does not meet the fume requirements either.
4 - I know, I know - you are thinking experimental.
Still not a reason to misplace good building practices or AC 43.13 2B
5 - Back to item #1 --- Cannot handle the current.
The R/C servo wire is about 22 AWG. It is in short runs. And has next
to
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| Quote: | zero current ... Miliamps!
Your position lights are probably in the area of 2 Amps Each ... And you
have
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| Quote: | three, so you are looking at about 6 Amps.
Barry
"Chop'd Liver"
"Show them the first time, correct them the second time, kick them the
third
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