Hi to Every body
Belated greetings for the Holiday to you all.
I would like to pick up on a thread started by Peter Merguerian
regarding Varistors to Ground.
We manufacture Scientific Instruments and have recently had a piece
of equipment tested to the "new" s
Dear John,
Varistors to Ground (earth) is a very old fashioned way for
designing equipment to withstand transient voltages. A better and
more sophisticated way is to use some better engineering
principles; for example larger clearances/creepages (approx 6 mm)
and good design of the power
equipment type A, or is the spark-gap
/ fuse requirement in effect for pluggable equipment type B as well?
2) Will Denmark, UK, and Sweden accept varistors to ground if the circuit
contains a spark-gap and two fuses?
If this Decision means DK, UK, SE will simply not accept varistors to
ground, then
equipment type A, or is the spark-gap
/ fuse requirement in effect for pluggable equipment type B as well?
2) Will Denmark, UK, and Sweden accept varistors to ground if the circuit
contains a spark-gap and two fuses?
If this Decision means DK, UK, SE will simply not accept varistors to
ground
This information is very timely since I am currently working on a project
that requires varistors to ground. The varistors are not approved. How
does one size the spark gap firing voltage and the fuse value? I am
concerned with the fuse opening when the equipment sees a transient.
Also, if the
Hello;
I appreciate the discussions and information gained. Can any point me to where
on the Web I can get copies of CENELEC Decisions such the referenced CENELEC
Decision (dated 6/98)?
Thanks,
Ray Hulinsky
RCIC - http://www.rcic.com
Regulatory Compliance Information Center
-
Th
tic.com
To: emc-p...@majordomo.ieee.org
cc:
Subject: RE: Varistors to ground
Volker, thank you for this useful information. You indicated that
the decisions are to be followed by all of the test houses, yet many of the
decisions appear to be accepted in only some countries. If all of the test
Stuttgart, Germany
owner-emc-p...@majordomo.ieee.org on 16.12.98 02:55:01
Please respond to jeich...@statpower.com
To: emc-p...@majordomo.ieee.org
cc:
Subject: RE: Varistors to ground
Volker: Thanks for the explanation.
I am left with 2 questions:
1. You wrote "The new decision is not part o
dition has been written by people aware of the OSM/EE
decisions, who consciously did not include the decisions in the new
edition, then do they mean that varistors to ground are acceptable and
not subject to the "requirements" in the 2 decisions you quoted?
2. It isn't clear wh
Volker, thank you for this useful information. You indicated that
the decisions are to be followed by all of the test houses, yet many of the
decisions appear to be accepted in only some countries. If all of the test
houses are expected to follow the decision, why are country exceptions
all
/Germany/IBM on 15.12.98 11:20
---
owner-emc-p...@majordomo.ieee.org on 15.12.98 02:11:00
Please respond to jeich...@statpower.com
To: j...@bighorn.dr.lucent.com
cc: emc-p...@majordomo.ieee.org
Subject: RE: Varistors to ground
John: Sorry I can't help, but I am interested in what replies
er, John [SMTP:j...@bighorn.dr.lucent.com]
> Sent: Monday, December 14, 1998 9:07 AM
> To: 'emc-p...@ieee.org'
> Subject: Varistors to ground
>
> All:
>
> I have received a copy of a CENELEC Decision (dated 6/98) regarding
> the use
> of varistors between mains conductors and
requirement in effect for pluggable equipment type B as well?
2) Will Denmark, UK, and Sweden accept varistors to ground if the circuit
contains a spark-gap and two fuses?
3) The installation instructions for our PABX systems include the
requirement for a permanently connected ground wire between the
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