From: "Ian Chapman" <[email protected]>
Subject: RE: Ground on Tip & Ring
Norway relies on double insulation as a barrier. It's so rocky there I'm
told that they are not able to get a good safety ground. Other countries
with rocky areas (Scotland, Newfoundland) make or have made the population
of their rocky areas endure any risk.
Regards Ian.
> ----------
> From: John Honeycutt[SMTP:[email protected]]
> Sent: Tuesday, October 13, 1998 7:06 PM
> To: treg
> Subject: Ground on Tip & Ring
>
> Gentleman,
> I have designed an ADSL modem for my company. This modem will be sold all
> over the world. In designing for EMI compliance, I have added a series
> ferrite inductor in each Tip and Ring lead with two series connected
> 220pf/3KV capacitors from each Tip and Ring lead to a midpoint which can
> be
> optionally connected to chassis ground.
> It is unclear to me if connecting the midpoint of the series connected
> capacitors to the ground etch which connects to the PCB mounting bracket,
> which ultimately is attached to the computer chassis, violates safety in
> certain countries, i.e. Norway.
> I would appreciate your comments.
> John Honeycutt
> Senior Hardware Engineer
>
>
