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what determines the max current that can be drawn from a transformer's secondary coil?

how could i figure out what the max current i can get out of a transformers secondary coil? example: a welding transformer

NachoMahma7 years ago
.  Figure out what gauge/gage wire you have. Strip the (enamel) insulation and measure with a dial caliper or similar. Compare measurement to an AWG table.
.  Look up ampacity for that gauge wire. May get lucky and find that figure on same page as above.
.  This will give you a ballpark figure.