Simplest thing is to unplug the cord and insert a current tap and
clamp the probe around that.
There is some technology using field measurements for power lines.
I've seen an article on a handheld instrument that can measure
the current in zip cord. Claimed 10% accuracy. Does some kind of field
measruement that can
distinguish between the different distances of the wire from the sensor.
Not sure if the third ground wire messes that up. Twist probably
doesn't help either.
The meter was so far out of my price range that it seems that I didn't
save the reference to the article.
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