[RFI] Green Wire RFI

[Jim Brown]

On 11/15/2020 1:16 PM, K9MA wrote:
> 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 suggest that you study my tutorial on how ferrite chokes work. 
k9yc.com/RFI-Ham.pdf  An effective common mode choke is very lossy in 
the range where it operates, so transformer coupling through the core 
would be quite weak.
> 
> I’ll connect the green wire, but not through the choke.

NO! If all three conductors don't go through the choke as a single 
triplet winding, the choke adds inductance to the path that SHOULD blow 
the fuse, which delays the fuse blowing, which, as Frank observed, could 
make someone lose the use of themself.

And, since most power line RFI is ON the green wire, if it doesn't go 
through the choke, the choke won't do anything.

73, Jim K9YC