DSH 566 Permissible temperature rise, exposed vacuum tubes and enclosures of

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DSH 566

Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ... 7 k* }6 ~4 J4 y+ i

7.1.1, Table 3 + _" l- n" y% w2 A

60065(ed.7) " g3 k& L' Z: v% j. }

Standard(s):
1 ~' ^# ^# v8 R+ C0 h# i, z# NIEC 60065, Ed. 7
. V0 N: d, V$ X8 [& g& u7 uSub clause(s):
7.1.1
* @. n9 ]( v! v! ~, H: b; C3 d2 s5 wTable 3
Sheet:
DSH n. 566
% j5 `) D1 |: k6 l" E0 s4 j# |Subject:
Permissible temperature rise,
exposed vacuum tubes and
" Q4 {/ P$ u: v& U5 ^enclosures of apparatus
containing vacuum tubes.
  h( v1 L* s! ?$ GKey words:
# l0 r  v/ l# \- accessible parts
) ]# w$ t: q4 T( h- vacuum tube
4 o. D2 `$ J$ i; J2 h- maximum temperature
3 n8 P& C8 C% D$ V1 IDecision approved
/ v# K4 j6 m. k) c. M: u/ mduring the CTL Plenary
Meeting 2006
  \& H) E7 g! u5 wQuestion:
. Q8 Q' P  I0 X6 a' M# w5 I3 ZWill an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
tube be allowed to have a 65K temperature rise under normal operating conditions?
Decision
The 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
vacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface
5 U+ i& S! N7 {/ G7 D& Idoes not incorporate any user switches or controls intended to be handled during normal use.
8 {7 A* i( p/ h/ {5 mThe 65K rise is applicable to
1) metallic apparatus enclosures,
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
; B0 n8 x/ U2 e4 A- Land
3) ACCESSIBLE parts of vacuum tubes.
$ l$ J% o+ o# V+ B3 z+ iIt is also recommended that the user instructions advise the user to permit tubes to cool
before opening the access cover for service


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