<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi Brian, </div><div id="AppleMailSignature">ABS in section 10 electrical systems, 17.1 says cables & wiring within the</div><div id="AppleMailSignature">pressure boundary are to be low smoke, low/zero halogen cables.</div><div id="AppleMailSignature">So PVC is out according to them.</div><div id="AppleMailSignature">But don't shoot the messenger; if your PVC isn't packed in tight next to</div><div id="AppleMailSignature">some electronics then there probably isn't much chance of it catching fire.</div><div id="AppleMailSignature">Also if you have an extinguisher & a regulator on board you have back ups.</div><div id="AppleMailSignature">Part of the reason they don't like halogens is because of the acidic smoke that </div><div id="AppleMailSignature">can kill sensitive electronics. This would be more of an issue in a military</div><div id="AppleMailSignature">sub than a home built psub! Good to be aware of this stuff though!</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 21/05/2017, at 7:27 PM, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><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>--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>To: "<a href="http://psubs.org">psubs.org</a>" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><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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