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 ... 9 f2 P" S$ u1 U7 \) Z- `

7.1.1, Table 3 3 |0 L5 E% J2 ^! K5 J

60065(ed.7) 4 ^5 G3 ?3 V& x

Standard(s):
IEC 60065, Ed. 7
+ U+ U; z8 W- {# k& vSub clause(s):
7.1.1
0 j, D  n; x  w) G2 kTable 3
Sheet:
( ?3 A$ @; z3 t/ NDSH n. 566
Subject:
% c/ F6 S8 |6 uPermissible temperature rise,
6 _, Y  M9 _) ^& U6 d9 Mexposed vacuum tubes and
enclosures of apparatus
! d' `# J% n) U% z8 [containing vacuum tubes.
Key words:
' r) f( m7 d6 A$ V0 R8 @+ ?0 D% ^5 t- accessible parts
+ Q5 y& B6 ~8 `4 X: L- vacuum tube
2 t9 t, L" t+ u& Z0 U- maximum temperature
% y$ D4 t) T/ A4 k: mDecision approved
during the CTL Plenary
5 [' P3 N2 y. R& X7 N  cMeeting 2006
Question:
; Z- K! y8 Z% j7 ~7 R1 yWill an ACCESSIBLE vacuum tube or a ventilated enclosure top surface over a vacuum
1 W8 y: J7 L8 k6 Z2 ltube be allowed to have a 65K temperature rise under normal operating conditions?
Decision
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
does not incorporate any user switches or controls intended to be handled during normal use.
0 h* S7 K& O$ d  V9 ?. SThe 65K rise is applicable to
5 C6 ^- i& A0 d+ K6 l' A$ i" T1) metallic apparatus enclosures,
2) non-metallic apparatus enclosures taking into account Table 3 Note (c),
% c' b) _- w$ }* ?7 {* N" oand
3) ACCESSIBLE parts of vacuum tubes.
It is also recommended that the user instructions advise the user to permit tubes to cool
before opening the access cover for service
4 _) e; M- J1 O+ o; I3 p8 }
7 c2 u) P; `) C3 G. u
6 d' x4 i9 P8 [9 S