DSH 729 Temperature limit of main enclosure over heat sink

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DSH 729 + |2 R& R) V% _6 ]0 G/ B5 l" |( c - \6 ?. O. b# D7 N

Temperature limit of main enclosure over heat sink 4 R. [8 G( p# e1 ^9 k# N* w& d8 e* H

7.1.1, Table 3, note b

60065(ed.7)

Standard(s)- (incl. year) No. Year
IEC 60065:2001 DSH
# D7 j! M. l( O$ b5 m0729
2008
Category:
: p4 f- K- |" X. |1 JTRON
$ |* [- k$ o- Y" ]% |: m/ GSub-clause(s):
7.1.1, Table 3, note b
6 y5 z# n- W# ^6 ~Developed by: ETF2
Subject: Temperature limit
+ T* v( j$ w8 L3 Q& y% \8 q- d- Nof main enclosure over heat
! F( H+ k# }6 q2 a+ Csink
Key words:
  h: H% f0 ^2 o2 A. C5 |- Limits during normal
* B$ {3 f  s8 A3 p) D$ D1 Toperation
! z! H) Z2 f  ~0 W- Not likely to be touched
during intended use
7 {! t9 v  J6 B/ z- bDecision approved at the
46th 2009 CTL Plenary
2 q' X3 C% w8 SMeeting
8 c0 m; H+ f2 ~! ~& q0 z6 HQuestion:
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:
' q0 Q( I! T0 |·  the symbol (IEC60417, 5041) is marked on or adjacent to the heated area of the surface of
the enclosure, and
) w1 Z0 F5 G" N# D2 [* A3 N& U·  the minimum distance over the surface of the product between this area and any control
2 G, Z" J# a1 l' p" N$ V. L* T" C  Z, pintended to be operated during use is 150 mm or greater, and
6 d) \, h, T2 e" O+ a( P. z( H9 X·  the instruction manual gives information regarding it.
7 P& c" h$ j1 P/ R! c$ }