On Friday 01 January 2016 18:04:34 Ben Potter wrote: > > From: Bertho Stultiens [mailto:ber...@vagrearg.org] > > A bit longer explanation: > > See attached image. Outputs of the step-down transformer A and B are > > capacitively coupled to L1 and L2 through four parasitic capacitors. > > > Connecting A to ground when C1A not equal C2A or connecting B to > > ground > > when C1B not equal C2B will create a current in the ground connection. > <Huge Snip> > > Thank you for this image - I think I've finally got my head around the > utter basics of the American electricity supply system. Some of that > may have been is it single/two phase? > Having 3 phases and a neutral coming into your premises (aka UK > 3-phase supply) somehow seems less... subject to complexity > > Going really OT here (and I should probably start a new thread for > this) - what beyond a 1:1 ratio makes a transformer an 'isolation' > transformer. > No ohmic connection between primary and secondary. If there is, and its not just a carbon track from a lightning strike, its an autoformer, and potentially a killer because it doesn't isolate. Two pieces of wire are exactly equal to a 1/1 autoformer IOW..
> I have used the below transformer or similar as the primary power > transformer for machines (in the case of the 2kva one, a ram edm). And > have considered it to provide sufficient isolation > http://www.jmsonline.co.uk/product_info.php?cPath=22&products_id=54 > > If I'm wrong, please let me know (and ideally how to fix it) > > Thanks > Ben > > > ---------------------------------------------------------------------- >-------- _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
