Hi Gary:
In IEC 60664-1, 2nd edition:
3.1.1: Defines pollution
3.1.3: Defines pollution degree
4.6.2: Degrees of pollution in the micro-environment
(describes the 4 degrees)
In IEC 60664-1, 1.1, 1.2 editions:
1.3.11: Defines pollution
1.3.13: Defines pollution degree
2.5.1: Degrees of pollution in the micro-environment
(describes the 4 degrees)
For a very good background treatise, see Klaus Stimper's
"The Physical Fundamentals of Low Voltage Insulation
Co-ordination," published by VDE. Section 5.1.3 describes
micro-environmental categories, the predecessor to pollution
degrees. (The English version of this booklet is out of
print.)
If the 664 degree descriptions are not detailed enough for
your use, this booklet may describe the MEC's with the
detail that you are looking for.
Best regards,
Rich
From: [email protected] [mailto:[email protected]] On Behalf Of Gary Tornquist
Sent: Tuesday, November 13, 2007 11:00 AM
To: [email protected]
Subject: Pollution Degrees
Compliance comrades –
We’ve dug through IEC 60664-1. Unfortunately, we did not find what I was
looking for. I need your help once again. I am looking for an official
expose on what the IEC precisely means by ‘Pollution Degree’.
In which document do they describe/quantify this parameter? I understand that
it generally means ‘conductive dust and/or moisture’ and that it is used
to establish categories of creepage/clearance distances. Well, what the heck
is ‘conductive dust’ and how do they quantify the moisture levels?
– our Reliability team is trying to quantify moisture/dust exposure and
acceleration factors. Thanks for your help!
Sincerely,
Gary Tornquist
Director of Product Safety
Microsoft Corp.
425-705-6099
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