Groups > sci.electronics.design > #748197

Re: Ferrite ID

From	John R Walliker <jrwalliker@gmail.com>
Newsgroups	sci.electronics.design
Subject	Re: Ferrite ID
Date	2026-09-25 17:02 +0100
Organization	A noiseless patient Spider
Message-ID	<11965v3$3np9d$1@dont-email.me> (permalink)
References	<11965md$1i$1@reader1.panix.com>

Show all headers | View raw

On 25/09/2026 16:58, David Lesher wrote:
> Rheem tankless water heaters, fed with dual 40A 240V circuits,
> are driving all the Leviton and other brand dimmers berserk.
> The lighting all dims and flickers beserkly. The Rheem has a
> sharp spike at the peaks of the positive and negative cycles;
> that is the cause.
> 
> The cure is some ferrite chokes on the power feeds. But fields
> class was Many Decades ago. I'm trying to decide if I want ones
> with an ID that just accepts the #8 stranded, or it doesn't
> matter that much if it's a loose fit.
> 
> Thoughts?

A reasonably tight fit gives better results, as does using
a ferrite tube rather than a short bead.
However, if its a loose fit you may be able to feed multiple turns 
through it which works well at lower freequencies.
The material does make a difference too, according to the
frequency range you are trying to absorb.
John

Thread

Ferrite ID David Lesher <wb8foz@panix.com> - 2026-09-25 15:58 +0000
  Re: Ferrite ID John R Walliker <jrwalliker@gmail.com> - 2026-09-25 17:02 +0100
  Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 02:55 +1000
  Re: Ferrite ID john larkin <jl@htigct.com> - 2026-09-25 17:13 -0700
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-26 16:39 +1000
      Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-26 09:10 -0700
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:32 +1000
          Re: Ferrite ID Brian Gregory <void-invalid-dead-dontuse@email.invalid> - 2026-09-28 23:30 +0100
            Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-29 19:15 +0000
              Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-30 17:24 +1000
                Re: Ferrite ID john larkin <jl@glen--canyon.com> - 2026-09-30 07:50 -0700
                Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-30 20:00 +0000
        Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-27 16:34 +1000
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
      Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
    Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-09-28 16:30 +0000
  Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-26 11:57 +0100
    Re: Ferrite ID Bill Sloman <bill.sloman@ieee.org> - 2026-09-29 00:42 +1000
      Re: Ferrite ID Martin Rid <martin_riddle@verison.net> - 2026-09-28 11:04 -0400
        Re: Ferrite ID someone <2a59d59e3809f827ce709d3815e3950eef4a6a93af5557a93a7fdfba71460843@example.com> - 2026-10-01 04:15 +0000
      Re: Ferrite ID Ian <devnul@blackhole.com> - 2026-09-30 17:47 +0100

csiph-web