[PSUBS-MAILIST] data cable

[Alan via Personal_Submersibles]

Hank,
the very first penetrator I made was in a linear actuator. ( I am sure I've said this before)
I am not sure whether I stripped a section of the insulation or not,
but presume I did. It went through 1" of epoxy. 
When I filled the linear actuator with WD40, it just ran out down the outside
of the wire insulation. No pressure. I couldn't believe it. I was using a good epoxy.
I suppose not all insulation is the same & maybe another insulation would have
adhered better. But I haven't been very trusting since, & after Doug's videos,
even less trusting. I now have a mold for pouring a marine polyurethane over
everything as a wire support, additional barrier & to make it look pretty.
Also when I pour the epoxy in to the metal through hull I build a plastercine wall
around the top so I have a section of epoxy over the lip of the through hull to
stop any extrusion of the epoxy in to it. This is so any repetitive extrusion over
diving cycles doesn't cause the epoxy to tear from the through hull & create a 
leak over time.
Alan



> On 2/06/2020, at 12:59 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, I have tested my penetrators with no additional glue or silicone.  I agree silicone or glue is a good idea but in testing I have discovered that it takes 1,000 psi before air will pass between the wire shield and up the wire.  I tested be screwing the penetrator into a pipe.  I pressurized the pipe interior with air not water.  I then place the pipe in a bucket of water to look for bubbles.  Not until 1,000 psi will very minor random air bubbles appear.  If the test was reversed with water in the pipe then I suspect it would take much more pressure to push water past.  
> Hank
> 
> On Friday, May 29, 2020, 11:42:50 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Brian,
> I cover the insulation on the wires & the potting material with a PVC glue
> up to an inch from where it is potted. I use a 2 pot heat activated PVC glue
> that will tear the PVC before it peals off.
> Reason for this is water can force down between the PVC & the potting 
> material.
> Alan
> 
>> On 30/05/2020, at 4:38 PM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Thanks,  or maybe just tin the wires with solder .  But I"ll look for solid .
>> 
>> Brian
>> 
>> 
>> 
>> --- personal_submersibles at psubs.org wrote:
>> 
>> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] data cable
>> Date: Sat, 30 May 2020 01:24:15 +0000 (UTC)
>> 
>> Brian, it the strands are solid core, you can strip off the insulation and then pot.  If the strands are multi wire then cut and sold in a section of solid wire to pot.
>> Hank
>> 
>> On Friday, May 29, 2020, 7:01:08 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hi All,
>>             What would be the best way for me to pot a cat5 ethernet cable?    Would the insulation need to be removed?  
>> 
>> Brian
>> 
>> 
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