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The picture looks like it is clamped on a single wire. Yes, it works by
induction. But, if around two wires, it would not have n induced voltage. Current flow in the two wires would ech induce current, but in the opposite
direction. Result is no current induced. Old physics refers to this using (I
get them confused, one is motor and other is generator rule) right (left) hand
rule. Wrap hand around a conductor. Thumb points in direction of current flow
and fingers indicate orientation of induced magnetic field.

Think about unshielded twisted pair. Does not need shielding as the two wires
in the pair null induced voltage.

John McKee

Quoting Roger Harman <RHarman@xxxxxxxxxx>:

Works by induction.......

http://us.fluke.com/usen/products/categoryclmp



jamesl@xxxxxxxxxxxxxxxxx 12/15/2008 2:30:04 PM >>>
rob@xxxxxxxxx wrote:
Any competent electrician can put this thing that encircles the power
cord
and does nothing to interfere with the flow.

Actually, so far as I'm aware, such a device (an AC ammeter is what it's

called) needs to go around a *single* conductor, rather than around the
entire power cord.

--
James H. H. Lampert
Touchtone Corporation

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