Ed, I do not know your specific application. Therefore - if your TNV-2 circuit is connected to a telecom network - EN60950, 2nd ed/A4 andNorway/Sweden requires SI for the mains. (see EN60950:1992/A4:1997, AnnexZB) SI means clearance, creepage, DTI and dielectric strength for 230V mains.
Why don's you use EN60950, 3rd edition?
SubClause 6.2.1.2 asks for an insulation between earth and a telecom
network, tested only with 1.5kV insulation test.
As I read the standard, additional requirements exist - for Norway & Sweden
- but only for DTI (ref. EN60950:2000, Annex ZB).
Regards,
Kris Carpentier
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
"Ed Eszlari" <bosesaf...@hotmail.com> on 17.01.2002 16:43:49
Please respond to "Ed Eszlari" <bosesaf...@hotmail.com>
To: t...@world.std.com, emc-p...@ieee.org
cc: (bcc: Kristiaan CARPENTIER/BE/ALCATEL)
Subject: TNV-2 to Earth requirement
(See attached file: att1.htm)
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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