[PSUBS-MAILIST] Wire type for submersibles

[Stephen Fordyce via Personal_Submersibles]

Good work Alan!

Cheers,
Steve

On Sun, May 21, 2017 at 11:13 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec,
> I just found a good summary of marine grade wire.
> http://www.marinewireandcable.com/2013/10/marine-grade-wire.html
> It mentions the temperature ratings.
> In summary it says buy marine wire that specifies the UL 1426 standard.
> This standard covers wire above 50V, so you know you are safe with
> your <50V system.
> The ptfe coated wires I have seen are rated around 200C.  I haven't priced
> any yet!
> Alan
>
> Sent from my iPad
>
> On 22/05/2017, at 12:16 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> My wiring harness was designed by a friend who is a subject matter expert,
> and he had a cable requirement I would not have thought of. Besides
> amperage rating, he also wanted every cable rated for 105 degrees C. I
> believe this was a proxy that indicated the insulation material was
> suitable. For what its worth I ended up using Ancor brand marine cable
> throughout, as it meets the temperature requirement.
>
>
> Best,
>
> Alec
>
> On Sun, May 21, 2017 at 1:44 AM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> This is a summary of what I have been researching on wires.
>> Steve wanted to hear this, but I would appreciate any other words of
>> wisdom on this subject.
>>    As a generalization G.L. says protective coverings, sleeves, sheaths &
>> fillers are to be
>> made of halogen free materials. This is because they are toxic & acidic
>> when burning.
>> PVC has halogens in it, & it is a common insulation on marine grade wire!
>> Also PTFE
>> (Teflon) insulation has halogens. Subconn connectors have PTFE wire
>> insulation that runs
>> in to the hull.
>> In my view the halogen content won't matter if the wire is outside the
>> hull. G.L. does say that materials
>> & insulations for electrical equipment used in water are to be agreed
>> with G.L. in each single case.
>> G.L. also says insulation must be resistant to saltwater & oil vapors,
>> not be hydroscopic & has to
>> be flame retardant & self extinguishing.
>> PTFE has a very high flash point so possibly gains approval for internal
>> use from that perspective.
>>    There is a standard for electrical cable for boats "UL1426", & when
>> you search for marine electrical
>> wire it will quote a standard like that.
>> For sizing wire for submersibles ABS refers you to part 4, chapter 8 of
>> the "steel vessel Rules" &
>> table 6 in section 3.
>>    It started to get complicated as G.L. have a section Annex E that
>> deals with umbilicals etc.
>> I came to the conclusion that I would use a PVC insulated marine grade
>> wire that conformed to the
>> UL1426 standard for external use. And use PTFE insulated wire inside the
>> hull. My thinking on going
>> with PVC over PTFE externally is that my glues would be more likely to
>> stick to PVC than Teflon (PTFE)
>> on my home baked through hulls.
>> Cheers Alan
>>
>>
>>
>>
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