Brian -
I reread your post and see I may have misunderstood your question. The
statement you cited was in a UL report or in a Recognition Card? If in
a report, it is utterly useless and is an example of poor report
writing. Not quite useless if it was in a Recognition Card, since it
would
From: Brian O'Connell
Sent: Tuesday, March 13, 2007 12:48 PM
In an OBMW2 (UL) file, this comment is attached to one of the
wire types:
Additional consideration is needed before its use in
System's thermal aging.
Brian -
Looks like it's a catch-all flag. It doesn't appear to be
Good day
Does anyone know where I can find Regulatory Information for marketing and
importing, Disk Storage Arrays into Central and South American Countries, plus
the Caribbean nations?
Regards
Roger Anderson
EqualLogic, Inc.
9 Townsend West
Nashua, NH 03063
U.S.A.
Phone
In an OBMW2 (UL) file, this comment is attached to one of the wire types:
Additional consideration is needed before its use in System's thermal
aging.
While I am waiting for the usual 5 to 20 day reply time from an agency
engineer, could someone please advise if this means anything speacil to
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Tuesday, March 13, 2007 9:20 AM
To: emc-p...@ieee.org
Subject: Re: OT: standard component values
In message
be3336be85968d49be01e66d6e365b1e01b59...@sjc1amfpew01.am.sanm.corp,
dated Tue, 13 Mar 2007, Tarver, Peter
Determine installation environment, measure Working V, add I.T. safety
standard, stir well.
For a SMPS, only the MINIMUM creepage is determined by the rated input V;
otherwise is determined by empirical measurements of the WV across a
particular dim.
60950:1999 is obsolete.
R/S,
Brian
From: Amund Westin
Sent: Tuesday, March 13, 2007 10:13 AM
Interested in creepage distances
1) primary to secondary on the PBC
2) Primary to chassis
3) Secondary to chassis
4) Between primary leads on the PCB
I have the 60950:1999 in front of me and a lot of creepage
tables in chapter
Trying to find out the different required creepage distances on a PCB (it's
an AC/DC PSU) where the primary voltage is 230VAC avd secondary voltage is
24VDC.
Interested in creepage distances
1) primary to secondary on the PBC
2) Primary to chassis
3) Secondary to chassis
4) Between primary leads
In message a7769e7222893043ae07d32e8d2254556b1...@bssexc06.aei.com,
dated Tue, 13 Mar 2007, Powell, Doug doug.pow...@aei.com writes:
Years ago, I even had a program for my HP-67 calculator that would take
a desired value and show me the nearest standard value.
There is a small app at:
In message
be3336be85968d49be01e66d6e365b1e01b59...@sjc1amfpew01.am.sanm.corp,
dated Tue, 13 Mar 2007, Tarver, Peter peter.tar...@sanmina-sci.com
writes:
Or maybe there's a mathematical reason that hasn't occurred to me, like
some arithmetic progression, or even simple phobias or prejudices.
Take E12 series - 12 values based on 10^1/12 = 1.212 - you calculate the next
value by multiplying the last by this number 1.212 and rounding thus:
1.0
1.0 x 1.212 = 1.2
1.212 x 1.212 = 1.47 = 1.5
1.47 x 1.212 = 1.78 = 1.8
Regards,
Chris
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]
Peter,
My understanding is that each series, E12, E24, etc increments approximately
according to the corresponding tolerance such that adjacent values
approximately meet at the upper tolerance of one value and the lower
tolerance of the next greater value. This is rounded off to the nearest
The standard resistor values are selected to ensure that any resistor
manufactured can be marked as a valid part and sold. For 5% resistors,
each value is approximately 10% larger than the previous value. Anything
between 9.5 and 10.5 could be called 10 within 5%. Likewise, the 1%
resistor
Quote: These values were supposed to have been derived from the
mathematical series of equally spacing values logarithmically for each
decade.
http://www.eng-tips.com/viewthread.cfm?qid=71035page=5
Dave Cuthbert
Linear Technology
From: emc-p...@ieee.org [mailto:emc-p...@ieee.org] On
An off-topic question that hopefully someone can shed a little light
upon.
I have wondered for as long as I've been involved in things electrical,
why standard component values are what they are. Text books are of no
use and I've done more than a few internet searches on this in the last
ten
To Those Who are Interested in:
The following two standards took effect March 1, 2007.
GB 7251.2-2006 ( IEC 60439-2:2000)
低压成套开关设备和控制设备
第2部分：对母线干线系统(母线槽)的特殊要求
Low-voltage switchgear and controlgear assemblies—Part 2:Particular
requirements for busbar trunking systems (busways)
GB
In message
of317bf308.346aec2f-on8525729c.0069eb9a-8525729c.006aa...@hobartcorp.com
, dated Mon, 12 Mar 2007, Richard Pittenger
richard.pitten...@hobartcorp.com writes:
I assume that some of you are involved with products such as
back-lit LCD displays which use small fluorescent lamps
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