RE: Creepage on PCB acc to 60950-1

[emc-p...@ieee.org]

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60950:1999 is obsolete.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

 -Original Message-
 From: emc-p...@ieee.org [mailto:emc-p...@ieee.org]On Behalf Of Amund
 Westin
 Sent: Tuesday, March 13, 2007 9:13 AM
 To: emc-p...@ieee.org
 Subject: Creepage on PCB acc to 60950-1


 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 on the PCB

 I have the 60950:1999 in front of me and a lot of creepage tables in
 chapter 2.10.4.

 Anyone out there who could give me a short guidance how to
 interpret the
 tables in my case?

 Thanks.

 #Amund

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RE: Creepage on PCB acc to 60950-1

[emc-p...@ieee.org]

 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 2.10.4.
 
 Anyone out there who could give me a short guidance how to 
 interpret the tables in my case?

Amund -

There are too many things to  take into consideration and your description doe
not encompass all possibilities.  I can only recommend to read all of §2.10
and Annex F.


Regards,

Peter L. Tarver, PE
ptar...@ieee.org 

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