Re: System power question

Now that you mention it, I do recall that when our electricians were
testing some circuits they clamped it on one wire at the breaker panel.

jmmckee@xxxxxxxxxxxxxx 12/15/2008 7:23:15 PM >>>

Been too long. Thumb points toward magnetic pole. Direction fingers
curl
indicate current flow.

John McKee


Quoting John McKee <jmmckee@xxxxxxxxxxxxxx>:

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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