The open air fuses of Tesla packs eliminate the sort of creepage failure that Justin has recounted.where aerosol deposits from the vaporizing of the fuse leave traces for further arcing and leakage.
On Mon, Jan 21, 2019 at 10:05 PM Justin Kenny via EV <ev@lists.evdl.org> wrote: > I'm the owner of the Leaf Rex channel Cor mentioned earlier. I highly > caution against using PCB fuses in general, I've done testing on those > also: https://youtu.be/CMlpCX0bug8 If you have a relatively large open > circuit voltage in the system you are trying to protect, it will > create a conductive plasma and char the PCB, leaving behind a > "resistor" which can continue to burn, though hopefully > self-extinguish in keeping with the "flame retardant" part of FR-4. > > - Justin > > On Mon, Jan 21, 2019 at 1:09 PM <ev-requ...@lists.evdl.org> wrote: > > Message: 13 > > Date: Mon, 21 Jan 2019 15:25:38 -0500 > > From: Martin Klingensmith <mar...@nnytech.net> > > To: Lee Hart via EV <ev@lists.evdl.org> > > Subject: Re: [EVDL] 18650 cell level fuse wire > > Message-ID: <623a4924-a24a-52f3-b720-2ee3c2f69...@nnytech.net> > > Content-Type: text/plain; charset=utf-8; format=flowed > > > > > > IIRC I've seen "fusible links" on PCBs. They're a short section of > > copper trace that is much narrower than the rest of the trace. My > > understanding is that they're used for an extra level of protection or > > where the designer thinks they're really clever. For all modern PCB > > materials it's not *too* unsafe because they aren't (supposed to be) > > flammable. > > > > - > > > > Martin K > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > -- Michael E. Ross (919) 585-6737 Land (919) 901-2805 Cell and Text (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Tablet, Google Phone and Text -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20190121/df83f711/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
