Dave,
Quote of 950: "there shall be insulation between circuitry intended to be
connected to a telecommunications network and any parts or circuitry that
will be earthed ...., EITHER WITHIN THE EQUIPMENT OR VIA OTHER EQUIPMENT."
The equipment of Ed might not derive its power directly from the mains , but
might be connected to a second equipment that derives its power from the
mains. If this second equipment is pluggable equipment Type A and has only
basic insulation +PE between mains + earthed secondary circuitry, separation
as in clause 6.3.3.1 is still required.
Any additional information from Ed might be welcome to give a more precise
interpretation.
Regards,
Andre
From: David Heald <davehe...@mediaone.net>
Reply-To: David Heald <davehe...@mediaone.net>
To: Ed Eszlari <bosesaf...@hotmail.com>
CC: t...@world.std.com, emc-p...@ieee.org
Subject: Re: TNV-2 to Earth requirement
Date: Thu, 17 Jan 2002 16:33:51 -0500
Does your equipment plug into a primary (AC) circuit? Any TNV circuit
is considered a secondary circuit and if any and all power is derived
from the TNV network, the notes you referenced would not apply as a
primary circuit is not present.
Best Regards,
Dave Heald
Ed Eszlari wrote:
>
> All,
>
> I have a DC to DC "filter" which is rated 32 - 72 VDC input and output
> which I am considering to be TNV-2 according to EN60950/IEC60950 2nd
> edition.
>
> This filter has a metal chassis which is earthed, and it will be
> installed in a service access area only by qualified service
> personnel. It is not permanently connected or pluggable type B, and
> does not have a provision for a permanently connected earthing
> conductor. With all this considered, it seems that Norway and Sweden
> are the only Countries that require Supplemental insulation for a
> primary circuit between this TNV-2 circuit and earth.
> Is there any way around this requirement due to this filter operating
> at 72VDC and not being directly connected to mains?
>
> Any help would be appreciated.
>
> Ed
>
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