Original poster: "Herbaleta" <herbaleta-at-herbaleta.hr> What is absoultely best secondary for a 15 kV 120 mA system? I have acess to 160 mm and 240 mm PVC pipes? Do i need biger then 240 mm ones? What wire and how much turns? Thanks for answers Cheers Krešo - the Croatian coiler <http://free-kc.htnet.hr/Kreso-Bukvic/>http://free-kc.htnet.hr/Kreso-Bukvic/