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

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DSH 566 3 U# u) ~( C1 ]$ E9 f

Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ... - l0 V* `' ]. n* L% O

7.1.1, Table 3 + f( u2 s. Z: ^1 C; ?  `3 D

60065(ed.7)

- i  R0 o4 ]8 k0 yStandard(s):
& |. R2 N$ W. f0 k; U, C4 u; aIEC 60065, Ed. 7
Sub clause(s):
6 U  R& {2 E. z& D7.1.1
& _7 W% q) n0 b7 S1 Z$ K/ q* sTable 3
Sheet:
DSH n. 566
' {7 D3 \' i2 f9 U+ ]Subject:
2 N# W5 ]6 e8 u4 `8 J" v6 GPermissible temperature rise,
8 K* G5 N3 z9 m+ w( P2 Q, Q; H3 Zexposed vacuum tubes and
4 q% }! w. ^  D5 Y8 d  z& eenclosures of apparatus
' @: l* q" _! \# e/ D+ Wcontaining vacuum tubes.
+ i$ s# K  z8 ^- ]) q3 KKey words:
- accessible parts
- vacuum tube
: R7 D! A9 z) N' g( N: |4 k; x- maximum temperature
7 [/ p$ S& u2 m3 y' o5 pDecision approved
& u5 z! j: @! Y, Yduring the CTL Plenary
9 W  c4 p& b9 d  @" d8 JMeeting 2006
" ^7 Y* n/ A: \- O# c# h2 HQuestion:
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
! j" b- x8 z0 P1 f, I( ~5 P1 e, ]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
0 \) n* \' C- A- v3 R* `2 Ldoes not incorporate any user switches or controls intended to be handled during normal use.
+ q4 y' L: g1 H& C& FThe 65K rise is applicable to
1) metallic apparatus enclosures,
7 q! ^3 d! {! [; }5 g8 k! F2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
and
3) ACCESSIBLE parts of vacuum tubes.
It is also recommended that the user instructions advise the user to permit tubes to cool
3 {( {+ T# F( @; P0 b5 {  sbefore opening the access cover for service
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