Electronics > Beginners
Testing AC currents
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Gregg:
A word of caution using CTs: don’t leave them open circuit with a load.  Because of the high turns ratio, the voltage can become very high and degrade the insulation between turns, ruin test equipment and give you a nasty shock. 
Industrial installations of CTs often include a junction block with shorting bars positioned so that the CTs can be shorted before removing the metering devices.
Zero999:
Why not get another current transformer and run it in reverse?

You can then get 10A out from a much lower current supplied by the variac, with a small 6V transformer on the secondary.
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