Yes and no. The main problem is the isolation between the inner of the secondary=20 winding to the primary. This end of the secondary is usually at or=20 near ground. No problem. *if* you simply put the secondary windings in series, the inside of=20 the upper winding is many thousands of voltage above ground. Probable prob= lem. Solution: drive the primary windings in opposite phase with respect=20 to each other and treat the inner connection of each secondary as=20 ground. Now you have twice the voltage between the ends of the outer=20 leads on the secondary windings. Many (most?) neon transformers are built this way: center-tap is ground. dwayne At 02:22 PM 1/21/2015, IVP wrote: >Hi all, > >last week I made a couple of these Jacob's Ladders > >https://www.flickr.com/photos/97814409@N04/sets/72157647655795144/ > >The first was to be made into a true Jacob's Ladder, possibly >inside a sealed glass/plastic enclosure filled with something other >than air > >The second I wanted for a particular high voltage experiment > >It occurred to me last night that two secondaries could be put in >series to make 60,000V (with the primaries driven in parallel) > >Logic would say that I can treat them as any other transformers >but are there any HV considerations I should be aware of ? > >TIA > >Joe --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=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 .