Hi Conor,the secondary of my B&W ~16" coil is spacewound 820 turns with double-coated
1 mm2 Thermex 2.5 (enamelled) wire (diameter 1.33mm, with insulation). As a distance-keeper we wound a ~0.9mm cotton thread. The spacewinding proofed useful, not so much for saving copper, but when some primary to secondary arcs hit the sec, and needed small polyurethane repairs. For more details click on: http://home.datacomm.ch/k.schraner/b_and_w.htm http://home.datacomm.ch/k.schraner/bw_sec.htm If doing the job again, I might use PVC-coated wire, which is thick enough (with insulation) to result in the right H/D ratio of ~4.5-5, when using closewound practice. Best regards Kurt ConorPerry@xxxxxxxxxxx wrote:
I'm trying to help someone with a 20" secondary which is starting to fall apart. It's space wound, probably 20-22 gauge wire, and the windings are seperating from the PVC. This has caused several locations of arcing between windings and carbon tracking. All the modern coils that I've seen (12" and under) are tightly wound usingthe wire gauge size which will cause the correct winding lengths. But when you get into a secondary this large what to do? Is THHN,TFFN, or MTW suitable at all? Is space-wound still and option to help save on copper costs? If we do space-wound, what gauge should be used? Conor _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxhttp://www.pupman.com/mailman/listinfo/tesla
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