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finn.lassen(at)verizon.ne
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 Posted: Wed Apr 22, 2020 5:42 pm Post subject: Minimum wire size in aircraft |
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I've been told that the minimum wire size allowed in an aircraft is 22 AWG.
Why?
A LED position light in the tail pulling less than 0.5A would have less
than 0.3V drop over a 17 foot run.
Is it a mechanical issue?
Doesn't make any sense to me.
Finn
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dglaeser
Joined: 23 Feb 2018
Posts: 2
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| Posted: Wed Apr 22, 2020 6:29 pm Post subject: Re: Minimum wire size in aircraft |
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Who is it that told you that?
Nobody told the Ray Allen trim folks about that ‘rule’ 😎. They use 26 AWG for their wiring. They are a pain for making connections, so most folks prefer using 22AWG or larger for ease of use, but smaller wires are obviously ‘allowed’.
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Dennis Glaeser |
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finn.lassen(at)verizon.ne
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| Posted: Thu Apr 23, 2020 4:49 am Post subject: Minimum wire size in aircraft |
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On 4/22/2020 10:29 PM, dglaeser wrote:
| Quote: | Who is it that told you that?
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JD at InfinityAerospace: "My A&P book says wires in a plane can't be any
smaller than a 22 gauge wire. But Sport Aircraft can do what they want."
Seems I've come across it elsewhere, too but don't remember where.
Finn
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nuckolls.bob(at)aeroelect
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| Posted: Thu Apr 23, 2020 4:57 am Post subject: Minimum wire size in aircraft |
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At 08:38 PM 4/22/2020, you wrote:
| Quote: | --> AeroElectric-List message posted by: Finn Lassen <finn.lassen(at)verizon.net>
I've been told that the minimum wire size allowed in an aircraft is 22 AWG.
Why? |
Not true. The B390 Premier aircraft used a lot of 24 AWG
wire . . . okay electrically but the line crew really
disliked the stuff. It's not easy to work with.
| Quote: | A LED position light in the tail pulling less than 0.5A would have less than 0.3V drop over a 17 foot run.
Is it a mechanical issue? |
The only rule of thumb I recall at Beech was minimum
of 20AWG under the cowl for new designs . . . but
mostly for mechanical reasons.
Had a builder some years back that scored a good deal
on a big spool of 20AWG Tefzel and wondered if it
was suitable for ALL routes of 7A or less . . .
of course it was. His radio bundles were a bit
thicker but the d-sub pins would accept 20AWG
no problem . . . and he didn't need to 'stock'
two sizes of 'smaller' wires.
There are no prohibitions from the regulatory
standpoint for using any size wire but a lot
of practical reasons for not getting carried
away . . .
Bob . . .
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