I found it here: http://www.belden.com/techdatas/english/8868.pdf My memory was wrong - it is rated 24kV. I may have been using it beyond its rating. Sean On Mon, Aug 14, 2017 at 12:23 PM, Van Horn, David < david.vanhorn@backcountryaccess.com> wrote: > Interesting.. Whose wire? > > I will see if I can get a pic > > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of Sean Breheny > Sent: Monday, August 14, 2017 10:21 AM > To: Microcontroller discussion list - Public. > Subject: Re: [EE] Fake Cable > > Can you post a photo of the cross-section of the cable? I've seen HV cabl= e > which had a thin layer of fairly rigid plastic on the outside and some ki= nd > of foam insulation on the inside. I used it at around 35kV and there wasn= 't > any leakage from the cable and I believe it had a claimed rating of 50kV > and was only about 4mm thick. > > On Mon, Aug 14, 2017 at 11:51 AM, Van Horn, David < david.vanhorn@ > backcountryaccess.com> wrote: > > > It's definitely not kapton or silicone. It doesn't look like anything > > special at all. My bullshit meter is in the yellow when I look at thi= s > > stuff. > > > > > > -----Original Message----- > > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > > Behalf Of alan.b.pearce@stfc.ac.uk > > Sent: Monday, August 14, 2017 9:12 AM > > To: piclist@mit.edu > > Subject: RE: [EE] Fake Cable > > > > If it has a polyimide (kapton) insulation it could be quite high > > voltage cable. One place I worked when I was contracting we got to > > wondering what the voltage insulation of a piece of kapton > > self-adhesive tape was, so we stuck a piece to a sheet of aluminium > > and got out the HV generator probe and had about 8kV (IIRC, certainly > > well up in the single digit kV) which was the limit of the HV > > generator without the kapton failing. Other PETE series insulations > > are related to kapton and could well also have excellent voltage rating= s. > > > > I suspect motor vehicle ignition cable is designed for low capacitance > > to the engine body, which is why it is so thick, instead of using a > > thinner insulation. > > > > I suspect EHT wire in CRT TV sets is derived from vehicle ignition > > cable, which is why it is so thick, it is a cheap well understood > > insulation against a higher cost thinner insulation. > > > > > > > > > > > -----Original Message----- > > > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On > > > Behalf Of Van Horn, David > > > Sent: 14 August 2017 15:31 > > > To: Microcontroller discussion list - Public. > > > Subject: [EE] Fake Cable > > > > > > > > > I hadn't really thought about this before, and now I'm curious. > > > > > > I ran across a product which uses some single conductor cable which > > > is marked with their logo and "50kV". > > > They certainly don't make any sort of wire, so this is something > > > they are having custom marked for them. > > > I worry that the "50kV" is rather fanciful. > > > > > > How can I test the insulation of wire, and what exactly causes a > > > wire to be rated for a given voltage? > > > > > > I've seen 600V power tool wire that's got far more insulation than > > > this stuff, but I can't tell materials by eyeballing it. > > > > > > Ideas? > > > > > > > > > > > > -- > > > David VanHorn > > > Lead Hardware Engineer > > > > > > Backcountry Access, Inc. > > > 2820 Wilderness Pl, Unit H > > > Boulder, CO 80301 USA > > > phone: 303-417-1345 x110 > > > email: > > > david.vanhorn@backcountryaccess.com > > yaccess.com> > > > > > > -- > > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > > View/change your membership options at > > > http://mailman.mit.edu/mailman/listinfo/piclist > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at http://mailman.mit.edu/ > > mailman/listinfo/piclist > > > > -- > > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > > View/change your membership options at > > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at http://mailman.mit.edu/ > mailman/listinfo/piclist > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .