Doug --
Joe Musso, staff engineer at UL, might be worth contacting.
About 10 years ago I was is a similar position with what I considered an
outdated spacings table in UL 1450. Joe was the staff engineer supporting 1450
at the time.
What Joe suggested, and what ended up working out well, was
Hi Rich,
Yes, I obtained a copy of Mr. Stimper's book in 1995 and after learning it
is no longer published in English, I obtained permission from him to use it
in my own work; with proper attribution. This book is an excellent the
resource. I first learned my compliance with IEC, DIN-VDE and EN
Hi Doug:
I don’t have any history. But I do have data for how air behaves as an
insulator and protection methods for creepage distances.
The data for air insulation as a function of distance (2000 meters altitude)
and field shape was given in IEC 664, first edition, 1980. The
Sorry all,
I knew the listserv would not support images, but since it regularly sends
me HTML email, I had thought it would allow tables in the body of the email
. Hopefully you'll still get the gist of the email.
~Doug
On Tue, Jan 25, 2022 at 11:26 AM Douglas E Powell wrote:
> All,
>
> I'm
All,
I'm interested in learning the history behind what I call old school
spacings found in UL standards. In recent years there has been considerable
progress toward harmonizing UL spacings to international standards, derived
from IEC 60664-x. However, still today I encounter many UL standards
Regarding your second statement, did you mean EMF that is part of LVD? EMC and
LVD are two independent directives.
Regards,
Scott
-Original Message-
From: Paasche, Dieter
Sent: Tuesday, 25 January 2022 3:45 am
To: 'scott...@gmail.com' ; EMC-PSTC@LISTSERV.IEEE.ORG
Subject: RE:
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