[PSUBS-MAILIST] Wire type for submersibles

[Alan via Personal_Submersibles]

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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