[RFI] Leakage (was RFI Canceling RFI?)

Cortland Richmond ka5s at earthlink.net
Fri Mar 10 11:07:53 EST 2006

> [Original Message][SNIPPET]
> From: Jim Brown <jim at audiosystemsgroup.com>
> I am raising this issue to alert the EMC folk on this list to the 
> issue, because I am seeing systems where the "willy-nilly" use of 
> bypass capacitors on multiple circuits in large systems (like large 
> lighting or motor control systems) is shoving huge currents onto the 
> green wire and causing serious interference to audio systems. Last 
> year, I measured 60A on the green wire in the distro panel of a 
> theatrical lighting system in a "megachurch" in Maryland. When we 
> asked the Electrical Contractor to find and fix the problem, he told 
> the client the condition was "normal."  Huh?

 The max leakage for ITE is 3.5 ma; to get 60 amps there would have to be
over 17 thousand of 'em. He had a crossed neutral/green, all right.   And
of course green wire is just a way to make sure breakers open on shorts to
chassis. It isn't  "ground" for us. 


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