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jluckey(at)pacbell.net
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 Posted: Mon Oct 12, 2020 10:57 am Post subject: Cinch Box Termina Block |
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Are these "cinch box" connectors considered gas-tight. I have to imagine they are since the terminal block is UL & CSA, etc approved.
However, I don't see them used very much on aviation devices. Is there a reason for that?
Please see the attached photo.
Thx,
Jeff Luckey
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Ceengland
Joined: 11 Oct 2020
Posts: 378
Location: MS
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| Posted: Mon Oct 12, 2020 11:54 am Post subject: Cinch Box Termina Block |
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On Mon, Oct 12, 2020 at 2:05 PM Jeff Luckey <jluckey(at)pacbell.net (jluckey(at)pacbell.net)> wrote:
| Quote: | Are these "cinch box" connectors considered gas-tight. I have to imagine they are since the terminal block is UL & CSA, etc approved.
However, I don't see them used very much on aviation devices. Is there a reason for that?
Please see the attached photo.
Thx,
Jeff Luckey
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I've seen similar devices with corrosion in the wire junctions. I don't care for them more because there's no inherent strain relief outside the stripped area of the wire (up on the insulation), than the gas-tight question. They do have the advantage of not requiring additional connectors; just strip, insert, tighten.
FWIW...
Charlie
 Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2][/url]
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 12, 2020 12:38 pm Post subject: Cinch Box Termina Block |
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At 01:55 PM 10/12/2020, you wrote:
| Quote: | Are these "cinch box" connectors considered gas-tight. I have to imagine they are since the terminal block is UL & CSA, etc approved.
However, I don't see them used very much on aviation devices. Is there a reason for that? |
Gas tight generally means that the
wire strands are totally surrounded
by the wire-grip which is compressed
such that no voids exist between the
wire and the wire grip. This generally
requires that the individual strands
are no longer round having been firmly
mashed against each other inside the
wire grip. Read: pressures generally
exceeding 30,000 psi.
https://tinyurl.com/yxwqtvwz
These 'clamp' connectors would not
meet that definition. Having said
that, I think EMagAir uses this
style connector on their plug-n-
play magneto products. Of course
we've seen them on countless COTS
products some of which are suggested
for use in less than friendly environments.
Where did you think you might use
them on your project?
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 12, 2020 1:10 pm Post subject: Cinch Box Termina Block |
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| Quote: |
I've seen similar devices with corrosion in the wire junctions. I don't care for them more because there's no inherent strain relief outside the stripped area of the wire (up on the insulation), than the gas-tight question. They do have the advantage of not requiring additional connectors; just strip, insert, tighten. |
Charlie brings up another point probably
more important than gas-tight: Insulation
support.
Some of the graybeards here on the list will recall
a fellow named Greg Richter who offered one of
the earliest OBAM Aviation EFIS systems under the
Blue Mountain trade mark.
In a how-to document he published, there was an
picture of another make-it-easier-wire-product
that sort of competed with EXP-Bus. See picture
below. See the critique of this product on pages
41-42 of:
http://www.aeroelectric.com/articles/richter/response_1.pdf
Greg was quite a conversationalist . . . you can
access the totality of our discussion over
his publication here:
http://www.aeroelectric.com/articles/richter/
But I agree with Charlie's short answer.
Bob . . .
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echristley(at)att.net
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| Posted: Mon Oct 12, 2020 2:20 pm Post subject: Cinch Box Termina Block |
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The corrosion Charlie mentions could be dealt with by using a smear of dielectric grease.
The strain release could be dealt with, and least in the device Bob pictures, by using a second row of connectors that the wire passed through before being clamped in the electrically active one. the second row wouldn't even need to be tightened down on the insulation, but it probably wouldn't hurt.
On Monday, October 12, 2020, 5:11:27 PM EDT, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
I've seen similar devices with corrosion in the wire junctions. I don't care for them more because there's no inherent strain relief outside the stripped area of the wire (up on the insulation), than the gas-tight question. They do have the advantage of not requiring additional connectors; just strip, insert, tighten. |
Charlie brings up another point probably
more important than gas-tight: Insulation
support.
Some of the graybeards here on the list will recall
a fellow named Greg Richter who offered one of
the earliest OBAM Aviation EFIS systems under the
Blue Mountain trade mark.
In a how-to document he published, there was an
picture of another make-it-easier-wire-product
that sort of competed with EXP-Bus. See picture
below. See the critique of this product on pages
41-42 of:
http://www.aeroelectric.com/articles/richter/response_1.pdf
Greg was quite a conversationalist . . . you can
access the totality of our discussion over
his publication here:
http://www.aeroelectric.com/articles/richter/
But I agree with Charlie's short answer.
Bob . . .
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jluckey(at)pacbell.net
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| Posted: Mon Oct 12, 2020 4:14 pm Post subject: Cinch Box Termina Block |
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I like the terminal strip because of the density of connections. In a previous email Bob attached a pic of GregR's appliance and I agree with previous comments that there is insufficient strain relief in that installation. However, with careful strapping very close to the terminal block one can reduce the "strain" on the connected wires.
To answer Bob's question, I plan to use the terminal block in a 6x6x3 inch aluminum box which contains all the hi-current stuff (start solenoid, master solenoid, shunt and all related fuses). It will mount on the firewall very close to the battery. One big wire will connect B+ to the box and then a big wire will go out to the starter. Then some #8s to the alternator, distribution panel.
The terminal block in question will be used to connect the control & metering wiring.
-Jeff
On Monday, October 12, 2020, 01:51:20 PM PDT, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com> wrote:
At 01:55 PM 10/12/2020, you wrote:
| Quote: | Are these "cinch box" connectors considered gas-tight. I have to imagine they are since the terminal block is UL & CSA, etc approved.
However, I don't see them used very much on aviation devices. Is there a reason for that? |
Gas tight generally means that the
wire strands are totally surrounded
by the wire-grip which is compressed
such that no voids exist between the
wire and the wire grip. This generally
requires that the individual strands
are no longer round having been firmly
mashed against each other inside the
wire grip. Read: pressures generally
exceeding 30,000 psi.
https://tinyurl.com/yxwqtvwz
These 'clamp' connectors would not
meet that definition. Having said
that, I think EMagAir uses this
style connector on their plug-n-
play magneto products. Of course
we've seen them on countless COTS
products some of which are suggested
for use in less than friendly environments.
Where did you think you might use
them on your project?
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 12, 2020 6:12 pm Post subject: Cinch Box Termina Block |
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At 07:12 PM 10/12/2020, you wrote:
| Quote: | I like the terminal strip because of the density of connections. In a previous email Bob attached a pic of GregR's appliance and I agree with previous comments that there is insufficient strain relief in that installation. However, with careful strapping very close to the terminal block one can reduce the "strain" on the connected wires.
To answer Bob's question, I plan to use the terminal block in a 6x6x3 inch aluminum box which contains all the hi-current stuff (start solenoid, master solenoid, shunt and all related fuses). It will mount on the firewall very close to the battery. One big wire will connect B+ to the box and then a big wire will go out to the starter. Then some #8s to the alternator, distribution panel.
The terminal block in question will be used to connect the control & metering wiring. |
Why not a d-sub connector? I can loan you a
Greenlee punch to cut the funky hole. I've
probably got plugs, sockets, back-shells and pins
laying around here too.
Bob . . .
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