Craig & PSNet,
For our purposes IEC 60664 series covers creepage and clearances.
This set is a Basic Safety Publication within the IEC and must be properly
applied in every higher level standard. They are not intended to be used of
themselves, product committees must determine the implementation of the
requirements - usually by reference or excerpting.
The series consist of:
Part 1: Principles, requirements and tests
Part 2: Application guide
Part 3: Use of coating, potting or moulding for protection against
pollution
Part 4: Consideration of high-frequency voltage stress
Part 5: A comprehensive method for determining clearances and
creepage distances equal to or less than 2mm
This only indirectly speaks to your question regarding spacings
versus altitude - altho the standard clearly states that the important
environmental parameters are air pressure and temperature.
Everyone who has been involved in this work understands Paschen's
law (dig out your physics text) and are applying it in developing the
standard.
If you have clearance issues that seem not to be covered by your
product standard then get these standards, study them then propose a change
to the product standard to properly cover the case you are dealing with.
br, Pete
Peter E Perkins, PE
Principal Product Safety & Regulatory Consultant
Tigard, ORe 97281-3427
503/452-1201 fone/fax
[email protected]
-
This message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. To post a message to the list, send your e-mail to
<[email protected]>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc-pstc
Graphics (in well-used formats), large files, etc. can be posted to that URL.
Website: http://www.ieee-pses.org/
Instructions: http://listserv.ieee.org/request/user-guide.html
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <[email protected]>
Mike Cantwell <[email protected]>
For policy questions, send mail to:
Jim Bacher: <[email protected]>
David Heald: <[email protected]>
