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

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DSH 566 5 k, B% E( y) D, N$ [8 F4 }& E

Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ... " t# a! i$ t7 W3 S- c9 g8 m" m

7.1.1, Table 3

60065(ed.7)

0 R% a( j0 P" e6 qStandard(s):
IEC 60065, Ed. 7
Sub clause(s):
: P7 H& F/ O0 N5 y% i0 Q7.1.1
0 s# @2 h2 J2 m$ E7 a7 w4 tTable 3
) P; J9 G. p; b' @6 G/ R* {Sheet:
. x% v$ h' A4 Z  E# i% W: tDSH n. 566
5 f7 F1 s$ Z5 C7 ~! q  HSubject:
Permissible temperature rise,
( q, s2 l, K; o2 D; q$ g/ Y& f0 Oexposed vacuum tubes and
4 |  V: r2 \3 X; ?7 }& venclosures of apparatus
) w$ X2 `0 x. Qcontaining vacuum tubes.
; M1 J. t, d# l! |Key words:
3 X  A: M  l: A- accessible parts
- vacuum tube
$ }: y, D* Q3 ]- maximum temperature
: B! H' Z2 U% R5 V  C1 j2 T$ S" I, pDecision approved
during the CTL Plenary
Meeting 2006
Question:
- Y" u  |4 A$ W: bWill 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?
# x. u4 h3 r/ C! Q: h) O: E; TDecision
The 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
# j* @5 [5 m; E, X+ f. V) p$ E+ Nvacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface
8 M0 {/ X2 R4 x, mdoes not incorporate any user switches or controls intended to be handled during normal use.
The 65K rise is applicable to
1) metallic apparatus enclosures,
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
( t  [# y% v0 S) n% @6 r6 Cand
3) ACCESSIBLE parts of vacuum tubes.
It is also recommended that the user instructions advise the user to permit tubes to cool
before opening the access cover for service

5 V8 {4 @3 r: ?& h& ]