Researchin's highlighted my naïvety:
Quote:
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Basically a current transducer generates a current or voltage (depending on the type) that is proportional to the current passing through the center of the transducer. There is a slight complication however. You can't just clip one of these around a piece of romex wiring since it contains both legs of the circuit. Since the current going out on the hot wire is equal to the current returning on the neutral wire, they will cancel each other out and the transducer will read zero.
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Ecomodding: I'm doin' it wrong.
Source:
Circuit Monitoring