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 . [: s5 _. Z" B

60065(ed.7) 1 V1 Z$ O1 L% |& `  E( o% }

Standard(s):
IEC 60065, Ed. 7
Sub clause(s):
& d1 [" B+ s0 l" ^6 T% Y7.1.1
Table 3
6 s5 W# p4 ~3 B! y; j4 w6 [Sheet:
DSH n. 566
- a  K. {: }6 V: zSubject:
  U- c! l  j0 ePermissible temperature rise,
. y6 D, u  p% p5 mexposed vacuum tubes and
# L# g- ~' ^5 \3 L$ @) w8 Y) i% oenclosures of apparatus
4 e0 S  Y  s! ^  |. Ncontaining vacuum tubes.
Key words:
- accessible parts
( }8 J! E. v8 U4 Q- vacuum tube
- maximum temperature
Decision approved
3 _2 x' V' V7 [( ?( w: s6 Bduring the CTL Plenary
Meeting 2006
2 K1 l2 T; u$ i& J# P2 SQuestion:
' d9 ^& y! @1 q% ?Will 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
2 W; x* N8 p7 d  rThe 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
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,
2 B2 M1 p$ U5 u, h6 ?2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
and
3) ACCESSIBLE parts of vacuum tubes.
& E- C& ?7 E8 h  g! P& `( qIt is also recommended that the user instructions advise the user to permit tubes to cool
" e% L+ Z8 ]6 x. @- ?% i1 wbefore opening the access cover for service

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