RE: Common mode voltage

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

Consider the two wire mains cable - hot and neutral.  Common mode refers to 
a signal that is pretty much the same on hot & neutral.  The voltage of 
interest is relative to ground, not between the two conductors.

The opposite of common mode is differential.  Here the voltage of interest 
is measured between the two conductors, and ground is irrelevant.

What I was getting at is that high voltage transients exist not between the 
two NST primary leads, but rather equally between each of the two leads and 
ground.

My "definition" may not be clinically precise, but I hope it helps.

Regards, Gary Lau
MA, USA

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, May 15, 2003 10:57 PM
To: tesla-at-pupman-dot-com
Subject: Common mode voltage


Original poster: "Steve K by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
<teslainnovations-at-yahoo-dot-com>

I am not very advanced with electrical terms and
such... I was just wondering what "common mode
voltage" means.

Steve