DSH 729 Temperature limit of main enclosure over heat sink
http://decisions.iecee.org/icons/ecblank.gif DSH 729
Temperature limit of main enclosure over heat sink
7.1.1, Table 3, note b
60065(ed.7)
Standard(s)- (incl. year) No. Year
IEC 60065:2001 DSH
0729
2008
Category:
TRON
Sub-clause(s):
7.1.1, Table 3, note b
Developed by: ETF2
Subject: Temperature limit
of main enclosure over heat
sink
Key words:
- Limits during normal
operation
- Not likely to be touched
during intended use
Decision approved at the
46th 2009 CTL Plenary
Meeting
Question:
Can the 65 ° K temperature rise limit be applied for the surface of the main enclosure covering an
internal heat sink in the same way as is applied for vacuum tubes following DSH-566?
Decision:
The 65 ° K rise limit may be applied to the enclosure covering an internal heatsink, if:
·the symbol (IEC60417, 5041) is marked on or adjacent to the heated area of the surface of
the enclosure, and
·the minimum distance over the surface of the product between this area and any control
intended to be operated during use is 150 mm or greater, and
·the instruction manual gives information regarding it.
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