[RFI] Green Wire RFI

[K9MA]

If both ends of a winding of a common mode choke are connected together, it’s like a transformer with a shorted winding and the impedance of the other windings is reduced. 

I’ll connect the green wire, but not through the choke. 

----------

Scott Ellington. K9MA

 --- via iPhone

> On Nov 15, 2020, at 1:38 PM, Eddie Edwards <eddieedwards at centurylink.net> wrote:
> 
> Scott, 
> 
> I'm confused or missing something perhaps, so wondering if you could explain how it would short-out an insulated green wire if it were wrapped around a ferrite core with the other two insulation wires?  
> 
> 73, de ed -K0iL
> 
> -----Original Message-----
> From: RFI <rfi-bounces+eddieedwards=centurylink.net at contesting.com> On Behalf Of K9MA
> Sent: Sunday, November 15, 2020 13:07
> To: Michael Germino <ad6aa at sbcglobal.net>
> Cc: RFI <rfi at contesting.com>
> Subject: Re: [RFI] Green Wire RFI
> 
> It is a “Direct Vent” type, with a blower and electrical ignition.
> 
> Of course, I verified that the tank was connected to the copper plumbing and electrical system ground. I could connect the green wire without going through the CM choke, though it would be redundant. Including that wire in the choke would short it out, making it ineffective on the hot and neutral wires. I can see how this could be a problem with other equipment which has a direct ground connection in addition to the green wire. In such cases, if there’s RFI on the green wire, it probably should have a separate choke. Thankfully, I’ve never had to deal with that.
> 
> 73,
> Scott K9MA 
> ----------
> 
> Scott Ellington
> 
> --- via iPad
> 
>> On Nov 15, 2020, at 10:44 AM, Michael Germino <ad6aa at sbcglobal.net> wrote:
>> 
>> Scott,
>> Why would your "gas water heater" be connected to the house power?
>> You made me recheck mine.  It appears to have a battery in the controller.
>> 
>> Mike73, AD6AA 
>> 
>>    On Friday, November 13, 2020, 5:48:53 PM MST, K9MA <k9ma at sdellington.us> wrote:  
>> 
>> While I generally agree that the green (ground) wire should go through the CM choke, here’s an exception: My gas water heater was shutting down whenever I was on 160. It has a grounding cord, but the ground is totally redundant because the tank is tied into the copper plumbing. (That would not be the case with non-metallic plumbing.) I made a choke with a two-wire extension cord, and left the green wire open. No more cold showers.
>> 
>> 73,
>> Scott K9MA 
>> 
>> ----------
>> 
>> 
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