[Top] [All Lists]

Re: [RFI] Power Line Bypassing

To: rfi@contesting.com
Subject: Re: [RFI] Power Line Bypassing
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 14 Feb 2011 23:24:11 -0800
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On 2/14/2011 8:16 PM, Dale Svetanoff wrote:
> Jim Brown raises excellent points in his post, below, but I can
> tell you that if the problem were with my well pump system, I'd have a very
> difficult time doing the by-passing in the most effective manner.
Sorry, I guess I didn't answer clearly enough. I did NOT suggest 
bypassing as a solution. Rather, I suggested 1) correcting any power 
wiring problems; and 2) adding a common mode choke at the noise source. 
For a well motor deep underground, the choke should go as close as 
practical to where the wiring that pump comes above ground. But, as you 
note, it's unlikely that the well pump underground is a variable speed 
motor, and is unlikely to be the source of the noise.

To answer Chuck's question, NO, bypassing at YOUR panel is unlikely to 
be a solution, for the reasons noted in my earlier post.  I have a well, 
roughly 100 ft deep, with both a pressure pump and a purification system 
above ground. It's possible that either that such a pump or purification 
system could be a noise source. Again, make certain that the power 
wiring is correct, and if there's still a problem, add a common mode 
choke, following the guidelines in my RFI tutorial.

BTW -- these potential power wiring problems are governed by Electrical  
Building Codes, which carry the force of law (your local building 
department). The National Electric Code (NEC) is a model code written by 
a consortium of very good engineers as a model, and has been adopted by 
most local governments. Wiring that violates this codes is both ILLEGAL 
and UNSAFE. These are not dumb beaurocracy, or government meddling, they 
are based on very solid principles of electrical safety. The safety 
hazards include lightning, fire, and electrical shock (which can cause 
death). Your friend should make this clear to his neighbor.

73, Jim Brown K9YC
RFI mailing list

<Prev in Thread] Current Thread [Next in Thread>