...@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
...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Carmen.Filimon
Sent: Friday, January 04, 2002 8:28 AM
To: EMC Forum
Subject: SMPS Derating reqs for Altitude range of 5000-1ft
Hi All
I'm trying to find out what the specified operational altitude
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
Hi All
I'm trying to find out what the specified operational altitude
range(s) is (are) for power supplies (particularly switching mode ones). Do
any of you know what that spec may be, and particularly what is the rule for
derating at altitude for thermal issues. Many
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