: Hi Dave,
: Congratulations on finding the baby pig and the transformer laminations.
: You have an excellent ballast core - a 2" x 4" core can easily
: handle 3 kVA. And your pig should easily handle intermittent overloads of
: 100%. Since you don't plan to use high temperature magnet wire in your
: ballast, I'd suggest using high temperature #12 AWG THHN (90 degree C)
: wire. This has PVC insulation housed within a nylon jacket that will help
: prevent insulation flow/failure at higher temperatures. The ballast should
: be good for intermittent 3 KVA duty from a 240 volt supply. Your large core
: size (2" x 4" or 8 square inches) will give you about 1 turn/volt
: (with no air gap), so using 240 - 300 turns should be in the right
: Would magnet wire be a better choice? I know with the thinner insulation I would get more TPI , I need to make a bobbin to wind it, should I also have layers of paper or something beteween the windings , I thought with the THHN I could skip that. And, should the windings be epoxied or something to keep them from vibrating, or , with my short duty cycle, this wouldnt be a problem? Thanks again!!!!!!!!!!!!!!!!!!
: Hi Dave,