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 ...

7.1.1, Table 3   `9 F- `; a% z! H5 i/ b/ ^

60065(ed.7) . n4 O5 d0 g% u: b8 K) U: D$ @

& d7 ^. B0 X( V0 H+ {Standard(s):
IEC 60065, Ed. 7
Sub clause(s):
7.1.1
Table 3
& |" i; q* n% ASheet:
DSH n. 566
0 ?9 |6 t" ?( V/ LSubject:
Permissible temperature rise,
+ w2 E8 W% u0 c' vexposed vacuum tubes and
enclosures of apparatus
containing vacuum tubes.
Key words:
; M! ^+ m9 M  w( n- g4 T; h- accessible parts
3 L; Z  L7 E: L7 A! W) C% P  {/ F- vacuum tube
- c( ?6 V/ Y* g! d8 \3 R8 b- maximum temperature
- m/ r% w  C" M. oDecision approved
during the CTL Plenary
4 T$ e8 C0 \% I% G7 G0 F/ \Meeting 2006
Question:
Will an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
9 u: J) {$ V0 f/ j5 ~tube be allowed to have a 65K temperature rise under normal operating conditions?
2 `: G  H, i) C) }7 t; f$ vDecision
% E3 l  s) t) J) b( s! F6 eThe 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over
1 G3 R5 J* U$ I3 b( ]* T  q2 Jvacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface
does not incorporate any user switches or controls intended to be handled during normal use.
The 65K rise is applicable to
1) metallic apparatus enclosures,
- I$ O! v1 P0 v/ S; v2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
+ s8 P* ]) C! D  t1 c& i) Sand
3) ACCESSIBLE parts of vacuum tubes.
4 l- w% B0 N! H) iIt is also recommended that the user instructions advise the user to permit tubes to cool
5 T1 {7 c7 O! V2 e- hbefore opening the access cover for service
# s8 A$ w8 k# \

, _2 R; `& j# l9 ~0 [  l  [0 A