Just looked up NoAlOx. Improves service life of aluminum electrical applications Reduces galling and seizing on aluminum conduit joints Suspended zinc particles penetrate and cut aluminum oxide
Seems it's not so much that the zinc makes it conductive as it helps break through the non conductive aluminium oxide layer and so improves the conductivity. So for aluminium connections it might be both useful and important to use something like this. For other situations (similar metals) just using petroleum jelly on a clean joint may work just as well; if the joint is tight enough the grease should be squeezed out and so does not interfere with conductivity only acts to exclude air and water reducing the potential for corrosion. While a dielectric is non conductive it does mean more than that, it's a property of an insulator and some have better dielectric properties than others. Lawrence On 2014-01-13, at 11:27 AM, Michael Ross wrote: > Dielectric essentially means non-conductive. The whole point of NoAlOx is > to enhance conductivity and it contains zinc powder - some one said (I > haven't looked into it much). > > Theoretically, why would you want to put a non-conductive material between > two current carrying members, when a conductive grease would do just as > well at protecting from moisture? I see no reason not to smear dielectric > all around outside, but it might end up in the current path just the same. > > > On Mon, Jan 13, 2014 at 10:49 AM, Hoegberg <hoegb...@hotmail.com> wrote: > >> interesting >> Noalox and Penetrox is not the normal dielectric?, >> >> so I would not use it on sensor plugs for example >> >> http://ecat.burndy.com/Comergent/burndy/product/PENA134 >> >> this seems to be zinc-fume/dust in thick non-petroleum grease and used for >> joins with alu-alu or alu-copper. >> >> /John >> >> ---------------------------------------- >>> From: marke.han...@hotmail.com >>> To: ev@lists.evdl.org >>> Date: Fri, 10 Jan 2014 10:04:14 -0500 >>> Subject: [EVDL] Dissimilar Metal Contact on LiFePO4 Battery Posts >>> >>> Hi Lee etc:I thought that stainless bolts would be a problem on >> connections on the Cray-3 supercomputer I worked with Seymour Cray on in >> Colorado Springs but the actual electrical connection is *not* through the >> bolt but through the contact surfaces of the terminal top and strap (the >> power supply was 2000A) - although it was in liquid flourinert - no >> corrosion. All the LiFePO4 batteries sold T-Sky & CALB batteries have M8 >> stainless bolts and copper straps supplied which are dissimilar metals with >> the aluminum threads on the battery terminals. I haven't heard of >> connection problems from those who actually drive their EV's 10K+ miles per >> year but first sanding or wire brush them & adding Noalox-probably best or >> dielectric grease to the contacts elleviates dissimilar metal galvanic >> corrosion. I noticed that doing nothing in a wet east coast environment >> leaves some white surface corrosion after 20k miles on the aluminum-copper >> contact point. I ordered NORD lock washers & Noal >>> ox from Grainger to redo all my connections with the stainless >> bolts.Have a renewable energy day,mark in roanoke, VA www.REEVAdiy.org >> >> >> >>> From: Lee Hart <leeah...@earthlink.net> >>> To: Electric Vehicle Discussion List <ev@lists.evdl.org> >>> Subject: Re: [EVDL] Keeping LiFePO4 battery terminals tight every 10k >>> miles >>> Message-ID: <52cc422e.4090...@earthlink.net> >>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed >>> >>> Michael Ross wrote: >>>> It is necessary to have a properly sized torque wrench, the willingness >> to >>>> look up the proper torque setting for the materials involved, and a >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA ( >> http://groups.yahoo.com/group/NEDRA) >> >> > > > -- > Put this question to yourself: should I use everyone else to attain > happiness, or should I help others gain happiness? > *Dalai Lama * > > Tell me what it is you plan to do > With your one wild and precious life? > Mary Oliver, "The summer day." > > To invent, you need a good imagination and a pile of junk. > Thomas A. > Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> > > A public-opinion poll is no substitute for thought. > *Warren Buffet* > > Michael E. Ross > (919) 550-2430 Land > (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone > (919) 631-1451 Cell > (919) 513-0418 Desk > > michael.e.r...@gmail.com > <michael.e.r...@gmail.com> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20140113/565e65aa/attachment.htm> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > -------------- next part -------------- An HTML attachment was scrubbed... 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