...@cae.com]
Sent: Tuesday, January 08, 2002 8:57 AM
To: 'Carmen.Filimon'; 'EMC Forum'
Subject: RE: SMPS Derating reqs for Altitude range of 5000-1ft
Importance: Low
As mentioned by some colleagues in this forum, some thermal effects due to
altitude are caused by reduced air density
Hi Chris, Andrew, Carmen:
With regard to safety, both effects of altitude
must be considered:
1) effect of air pressure on the electric
strength of air (clearance), and
2) effect of lower density air on the
temperature of solid insulation.
(Creepage is a
: Friday, January 04, 2002 12:59 PM
To: Carmen.Filimon
Cc: EMC Forum
Subject: Re: SMPS Derating reqs for Altitude range of
5000-1ft
Carmen
If your power supply is approved to IEC60950, then normally it will be
approved upto 2000m. Above this altitude the
required creepage
:59:15 AM
Please respond to acar...@uk.xyratex.com (Andrew Carson)
Sent by: owner-emc-p...@majordomo.ieee.org
To: Carmen.Filimon carmen.fili...@leitch.com
cc: EMC Forum emc-p...@ieee.org
Subject: Re: SMPS Derating reqs for Altitude range of 5000-1ft
Carmen
If your power supply
From the Paschen curve, the electrical spacings must be increased 14% at
3000 meters over those at 2000 meters. Thermal derating is a tougher call
since some smps vendors engineer in more cooling capacity than others.
Testing for your application is the only reliable way to make a good
Carmen
If your power supply is approved to IEC60950, then normally it will be approved
upto 2000m. Above this altitude the
required creepage and clearance distances start to increase. It is an
electrical insulation issue, not a thermal
issue.
Carmen.Filimon wrote:
Hi All
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