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

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DSH 566 " q6 d, H8 l1 |  w; i3 W

Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ... - @: ^6 M. e' W$ l( T# _+ S- l

7.1.1, Table 3 3 J; m6 {  r2 l! e

60065(ed.7) 3 N3 D  d2 m& J/ ]( J/ c, l

. a/ @% p1 B: c1 |: ^& wStandard(s):
IEC 60065, Ed. 7
Sub clause(s):
+ E+ j* X2 S* f' S' |- z: U( l7.1.1
, _3 Y6 p. w, C2 |( J: uTable 3
Sheet:
DSH n. 566
! j  a9 p6 [; h3 E3 F6 B% ~) i2 ZSubject:
! O5 S0 p0 q/ e4 X! sPermissible temperature rise,
+ x) {" N# l/ c3 I& D- dexposed vacuum tubes and
enclosures of apparatus
containing vacuum tubes.
Key words:
- accessible parts
+ m) J' l5 a$ r; g- vacuum tube
& }, h9 R; W9 d9 X: E0 @" q- maximum temperature
Decision approved
during the CTL Plenary
7 e$ B0 K5 t! U% H% [Meeting 2006
% ^1 v/ ]- G3 [! k2 X! |* k) GQuestion:
Will an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
1 Z% i9 M* B& j" [+ T+ etube be allowed to have a 65K temperature rise under normal operating conditions?
: W6 O2 x0 q( o% g2 {% P* s7 l$ DDecision
7 J7 e- O8 m' V7 V6 jThe 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
' [6 [8 z3 h" ^6 p0 x/ N& wdoes not incorporate any user switches or controls intended to be handled during normal use.
* H8 a) n) B9 [3 M+ rThe 65K rise is applicable to
; X/ T1 b. X5 |& m' c9 I, Z1 z/ q1) metallic apparatus enclosures,
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
' h, [, f6 M/ }; ^) h8 vand
3) ACCESSIBLE parts of vacuum tubes.
It is also recommended that the user instructions advise the user to permit tubes to cool
6 R+ B  [- }; A$ ^. t2 p9 M+ Sbefore opening the access cover for service

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* U$ b- Q* s/ w