Just a note, I pulled about 6 good Franceformers (GFCI, modern crap) from a dumpster. After 3 failed after a year of use I spent a day disassembling them. The cases to these were immaculate. The guys were atrocious. No tar...an epoxy of sorts. Poured sevral times with voids. Construction adhesive? Wood nails holding insulators? ROCKS as filler. (Seriously). HV potted lines within a few fractions of an inch of each another. Its a miracle they worked to begin with. All faults developed were poor design of the case and materials handling inside. The coils were fine. Having rocks within arcing distance...well...absolute fail. I was astonished by how little care was taken to finish a transformer that took so much effort to construct. In the end the GFCI headache was nothing compared to flaws of potting them in ways almost inconceivable for a commercial (and pricey) product...
Sent via the Samsung GALAXY S® 5, an AT&T 4G LTE smartphone
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