From: Jim <jim@jpes.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Fri, 7 Feb 2020 12:13:57 -0800
Subject: RE: [EE] Cable Shield Transfer Impedance, Induced current in wire
 from	shield?
Thread-Topic: [EE] Cable Shield Transfer Impedance, Induced current in wire
 from	shield?
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 My first thought would be to estimate or measure the impedance of the
wire in question, then use ohms law.
 A second less accurate method would be to estimate the length of the
wire, the size of the wire, and a possible=20
 termination resistance, and then again, use ohms law.
 And finally, a third method would be to measure it.  However, I don't
know that that would be practical, or=20
 achievable. =20

 Regards,

 Jim

> -------- Original Message --------
> Subject: [EE] Cable Shield Transfer Impedance, Induced current in wire
> from shield?
> From: Jason White <whitewaterssoftwareinfo@gmail.com>
> Date: Fri, February 07, 2020 1:31 pm
> To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>=20
>=20
> Hello everyone,
>=20
> Suppose there is a cable bundle containing a number of wires that are
> either in a aluminum conduit or wrapped with an aluminum braid. From
> what I have read I can expect a shield transfer impedance 0.1 to 0.01
> ohms/meter. If a 1 amp current is induced in the shield due to EMI I
> can expect somewhere between 10mv and 100mv to be induced on the wires
> within the bundle (when the wires are open circuit).
>=20
> Here is my question: how does one estimate the current that will flow
> when the wires are not open circuit? (eg. connected to a resistive
> load)
>=20
> --=20
> Jason White
> --=20
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--=20
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