<DIV style="font-family:Arial, sans-serif; font-size:10pt;"><DIV>Alan, Is PVC a no no for all types of PVC ? with American Bureau of Shipping as well ? What about PVC pipe ?</DIV><DIV> </DIV><DIV>Brian<BR><BR>--- personal_submersibles@psubs.org wrote:<BR><BR>From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org><BR>To: "psubs.org" <personal_submersibles@psubs.org><BR>Subject: [PSUBS-MAILIST] Wire type for submersibles<BR>Date: Sun, 21 May 2017 05:44:28 +0000 (UTC)<BR><BR></DIV><DIV style="color: rgb(0, 0, 0); font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px; background-color: rgb(255, 255, 255);"><DIV> This is a summary of what I have been researching on wires. </DIV><DIV>Steve wanted to hear this, but I would appreciate any other words of wisdom on this subject.</DIV><DIV dir="ltr"> As a generalization G.L. says protective coverings, sleeves, sheaths & fillers are to be</DIV><DIV dir="ltr">made of halogen free materials. This is because they are toxic & acidic when burning.</DIV><DIV dir="ltr">PVC has halogens in it, & it is a common insulation on marine grade wire! Also PTFE</DIV><DIV dir="ltr">(Teflon) insulation has halogens. Subconn connectors have PTFE wire insulation that runs</DIV><DIV dir="ltr">in to the hull.</DIV><DIV dir="ltr">In my view the halogen content won't matter if the wire is outside the hull. G.L. does say that materials </DIV><DIV dir="ltr">& insulations for electrical equipment used in water are to be agreed with G.L. in each single case.</DIV><DIV dir="ltr">G.L. also says insulation must be resistant to saltwater & oil vapors, not be hydroscopic & has to </DIV><DIV dir="ltr">be flame retardant & self extinguishing.</DIV><DIV dir="ltr">PTFE has a very high flash point so possibly gains approval for internal use from that perspective.</DIV><DIV dir="ltr"> There is a standard for electrical cable for boats "UL1426", & when you search for marine electrical</DIV><DIV dir="ltr">wire it will quote a standard like that.</DIV><DIV dir="ltr">For sizing wire for submersibles ABS refers you to part 4, chapter 8 of the "steel vessel Rules" &</DIV><DIV dir="ltr">table 6 in section 3.</DIV><DIV dir="ltr"> It started to get complicated as G.L. have a section Annex E that deals with umbilicals etc.</DIV><DIV dir="ltr">I came to the conclusion that I would use a PVC insulated marine grade wire that conformed to the </DIV><DIV dir="ltr">UL1426 standard for external use. And use PTFE insulated wire inside the hull. My thinking on going</DIV><DIV dir="ltr">with PVC over PTFE externally is that my glues would be more likely to stick to PVC than Teflon (PTFE) </DIV><DIV dir="ltr">on my home baked through hulls.</DIV><DIV dir="ltr">Cheers Alan</DIV><DIV dir="ltr"><BR></DIV><DIV dir="ltr"><BR></DIV><DIV dir="ltr"><BR></DIV></DIV>_______________________________________________
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