Posting for a non list member..
Victor L. Boersma vboer...@compuserve.com 03/29 5:54 PM
Message text written by INTERNET:t...@world.std.com
I have to agree that there shouldn't be another US (UL) standard for
network
equipment when the equipment can be incorporated into UL1950. UL1950 can be
Message text written by INTERNET:t...@world.std.com
I have to agree that there shouldn't be another US (UL) standard for
network
equipment when the equipment can be incorporated into UL1950. UL1950 can be
revised
to clarify the network equipment requirements, perhaps as a deviation or
an
appendix
Hello All,
I have to agree that there shouldn't be another US (UL) standard for network
equipment when the equipment can be incorporated into UL1950. UL1950 can be
revised
to clarify the network equipment requirements, perhaps as a deviation or an
appendix (annex), or just rewording the existing
...@ustech-lab.com]
Sent: Thursday, March 25, 1999 7:03 AM
To: 'emc-p...@majordomo.ieee.org'
Subject: RE: Network Equipment and UL 1459/1950
We just completed an approval with the exact same situation. I cannot
speak for your prodcut since I have not reviewed it. I can provide a
contact at UL
Jim,
Your interpretaion is 100% correct. I have personally Listed many
products with UL1950 Third Edition with a supplemental earthing
terminal as you described below with no basic insulation between
the TNV-2/TNV-3 circuits and SELV/Earth.
The standard specifies that basic insulation is one
Message text written by INTERNET:t...@world.std.com
In my view, these exemptions are specifically targeted at equipment such
as
PBXs and network equipment that are typically installed by service
personnel
and include hardwired grounding.
When Telecom equipment (of the non-network equipment
To: emc-pstc; 'TREG'
Cc: jim.wi...@adtran.com
Subject:Re: Network Equipment and UL 1459/1950
In a message dated 3/24/99, jim.wi...@adtran.com writes:
The only design criteria with regard to insulation in Bellcore standards
or
UL 1459 is a hi-pots test.
Creepage and clearance do not exist
In a message dated 3/24/99, jim.wi...@adtran.com writes:
The only design criteria with regard to insulation in Bellcore standards or
UL 1459 is a hi-pots test.
Creepage and clearance do not exist in traditional C.O. equipment (just look
at wire wrapped
backplanes).
Dear Jim and others:
A couple of comments:
-As Randy and Jim Brunssen will recall, an exhaustive comparison
of UL 950 and 1459 took place under TR 41.7.1 For those who
still have the paperwork, reams of rationale still abound.
This comparison, and the harmonization of UL 1459 and CSA
Standard C22.2 No. 225, were the
; harry.vanza...@telops.gte.com;
chuck_gr...@smtp.nynex.com; tto...@uswest.com; jmla...@uswest.com;
mben...@uswest.com; sbi...@hotmail.com; Larry Todd; Keith Kuhn
Subject:RE: Network Equipment and UL 1459/1950
Jim,
Thank you for giving us
...@telops.gte.com; chuck_gr...@smtp.nynex.com;
tto...@uswest.com; jmla...@uswest.com; mben...@uswest.com;
sbi...@hotmail.com; Larry Todd; Keith Kuhn
Subject: RE: Network Equipment and UL 1459/1950
Jim,
Thank you for giving us an opportunity to respond.
It would have been very helpful
11 matches
Mail list logo
