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| DSH 566# D* s. M+ {) ^4 F2 C/ z( t! ]+ ?3 h2 I
7 V- G. h, I. A8 b: Z; Q2 c
| Permissible temperature rise, exposed vacuum tubes and enclosures of apparatus containing vacuum tub ...
+ o; y6 ^, l& i3 V+ a; B0 T | 7.1.1, Table 35 ^8 D* z1 p0 }4 c2 x
| 60065(ed.7)3 Z: L9 J7 `9 S2 u2 y
| - |9 d* _7 l `
Standard(s):6 g- L' u( E$ p( E, J
IEC 60065, Ed. 71 Q# L6 L7 B- |$ ~+ B' b. H* H
Sub clause(s):
" _% I7 t) C6 k0 S2 n7 N7.1.18 W: ~' Q p$ p0 r
Table 3
" R( G1 n. x& U, k0 F5 x2 kSheet:
' H1 i( X: G; gDSH n. 5669 T2 V! b& E# W% w% J: m) Q
Subject:8 H+ Z9 i/ Q- v& Y" n) f
Permissible temperature rise,
7 W4 @) S3 l1 n. l3 |exposed vacuum tubes and' |$ S% `0 [! S5 G5 o: a7 `
enclosures of apparatus
# d8 W& ^0 I+ d5 L0 ~containing vacuum tubes.
, h- u$ [) s R# z- sKey words:: N0 z, r, k5 e
- accessible parts
2 a- H$ I3 N+ ]$ R! n- vacuum tube
" a- ]* \: m( J+ u2 ~- maximum temperature
0 O- ~$ Z$ n& x- rDecision approved+ D4 p/ P# o& S: Q: o
during the CTL Plenary
: W3 r3 S: [- L1 i$ yMeeting 2006
" U% c" K0 }! |' @Question:
6 o. u0 Q# [, n/ x* M: Y8 XWill an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
) X/ R! D2 _9 ]6 |# wtube be allowed to have a 65K temperature rise under normal operating conditions?7 {7 G6 c: v U2 {3 N1 x3 g" H
Decision2 L V4 S+ C3 m3 \1 K9 K
The 65K rise per Table 3 Note (b) to portions of the apparatus top enclosure surface over" O4 v: X+ P5 Z3 i7 s" x
vacuum tubes is allowed, if the vacuum tubes are easily visible to the user and the surface) ~* v/ z' S6 Q
does not incorporate any user switches or controls intended to be handled during normal use. ^5 V6 p. O* u& l: T" y
The 65K rise is applicable to0 `, B- @: W% r# C6 U; m! Z; x
1) metallic apparatus enclosures,
- |+ P, w" y. N2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
3 H3 i4 s* o+ k! ~and
Y( e' I! g4 o7 ^8 M3) ACCESSIBLE parts of vacuum tubes.
2 }+ H. Q' C N* _/ n+ v! YIt is also recommended that the user instructions advise the user to permit tubes to cool
$ N! V4 R- r: B+ R! L0 n2 ?before opening the access cover for service
7 w8 {* W% |4 `8 i+ V
0 U& a6 w" E4 y1 X4 w+ c7 @; o( X: V! f: c4 ?
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