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dfultz7(at)earthlink.net
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 Posted: Tue Feb 13, 2007 6:53 am Post subject: twisted wires |
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I am new to some of this wiring,, where all should twisted wires be used
when doing the aircraft wiring,, Thanks Dale
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Dale Ensing
Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC
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| Posted: Tue Feb 13, 2007 7:32 am Post subject: twisted wires |
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It is my understanding that twisted wire is used where there is a "signal"
in the wire such as engine monitor wiring or communication wiring and not
just DC current such as power to a motor or light. The electrical gurus may
have more to add.
Dale Ensing
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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC |
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nuckollsr(at)cox.net
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| Posted: Tue Feb 13, 2007 11:45 am Post subject: twisted wires |
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At 09:50 AM 2/13/2007 -0500, you wrote:
| Quote: |
I am new to some of this wiring,, where all should twisted wires be used
when doing the aircraft wiring,, Thanks Dale
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There are three ways that a wire can become an efficient
receptor or radiator of noise.
Electromagnetic - Close proximity of a potential victim
wire to a wire that carries strong -AND- dynamic
current will magnetically couple a component of that
current in the form of "noise".
Electrostatic - Close proximity of a potential victim
to a wire that carries a strong -AND- dynamic voltage
will electrostatically (capacitively) couple a component
of that voltage in the form of "noise".
Electromagnetic Radiation - A wire that carries (or is
exposed to) a strong radio frequency field may become
an antenna that emits or becomes victim to that energy.
Of the three, electromagnetic is the strongest and most
prevalent noise propagation mode from wire to wire.
Electrostatic is next and electromagnetic is last in terms
of probability for system integration problems having to
do with "noise".
A simple and extremely effective means for reducing
potential for either victimhood or antagonistic participation
in a noise problem is to make sure that every electron that
travels one way in a circuit is paired in close proximity
with another electron in the same circuit but traveling the
opposite direction. The twisting of an outbound and inbound
current path is easy to do and offers a high degree of
isolation for the electromagnetic coupling case . . . and
offers some benefit for the other cases as well.
Having said that, know also that there are very few instances
where noise mitigation processes are automatically called for
as a good design practice. I mentioned it for the EL panels
only because I had a noise issue on a big Piper about 20 years
ago where EL inverter noise was getting into the audio system
and we fixed the problem by twisting the pairs of wires that
ran from the distribution connector out to an array of
individual EL panels.
This was not intended to cause anyone to be concerned for
having not twisted any wires in other situations. The
major risk situations are generally taken care of in
the installation instructions for the systems . . . so
don't run off and start twisting things before we talk
about it here on the List.
Bob . . .
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( IF one aspires to be "world class", )
( what ever you do must be exercised )
( EVERY day . . . )
( R. L. Nuckolls III )
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raymondj(at)frontiernet.n
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| Posted: Tue Feb 13, 2007 1:01 pm Post subject: twisted wires |
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Bob,
Is there a down side to twisting besides the $time$ issue?
Thanks,
Raymond Julian
Kettle River, MN
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nuckollsr(at)cox.net
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| Posted: Tue Feb 13, 2007 3:59 pm Post subject: twisted wires |
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At 03:00 PM 2/13/2007 -0600, you wrote:
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Bob,
Is there a down side to twisting besides the $time$ issue?
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Nope, never hurts . . . well, it WOULD increase the cross section
of a wire bundle.
Bob . . .
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