Well see, the max current occurs probably a fraction of a second before the thing fails? You feed power at variable voltages, with a load and see what it does. Then use maths to extrapolate the graph to the max (where it goes pop and catches fire...) L
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If its not tapped in many places to generate different voltages, you can form a pretty good idea from the size of the transformer, and the output voltage. Steve
. If the current rating is not on the xformer then you can get a ballpark figure by measuring the gauge of the wire and looking up the ampacity.