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@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@contesting.com> On Behalf
> Of K9MA
> Sent: Sunday, November 15, 2020 13:07
> To: Michael Germino <ad6aa@sbcglobal.net>
> Cc: RFI <rfi@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@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@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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