Ground Fault Interupters and RFI filters

• To: tesla-at-pupman-dot-com
• Subject: Ground Fault Interupters and RFI filters
• From: Tesla List <mod1-at-pupman-dot-com>
• Date: Sun, 28 Sep 1997 23:11:33 -0600 (MDT)
• Approved: mod1-at-poodle.pupman-dot-com

---------- Forwarded message ----------
Date: Sun, 28 Sep 1997 22:10:34 -0500 (CDT)
From: Richard Wayne Wall <rwall-at-ix-dot-netcom-dot-com>
To: tesla-at-poodle.pupman-dot-com
Subject: Ground Fault Interupters and RFI filters 

9/29/97

I recently added a 30 A circuit breaker/GFI to my power cabinet.  It's 
placed before the main contactor and variac.  Following the variac 
there is a 100 A RFI filter.  Without the main power transformer 
connected, the GFI trips when power is applied.  It still trips when 
either the neutral or hot is disconnected and the other remains 
connected.  Removing the RFI filter stops the GFI tripping.  I replaced 
the RFI filter with two 200 A EMI filters on both the neutral and hot 
line.  Same thing happens as with the RFI filter.

Has anyone had this experience with GFIs and RFI filters?  Anyone know 
what the mechanism is?

RWW

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