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|  DSH 589/06) L5 P; i# w* q0 h, A3 ]) C. v
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| Heat and fire protection
+ S& l* u) G7 o: S/ |+ [ | 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3" m3 E) ~" U" h9 M( @
| 61558-1(ed.1);am1
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2 G2 f3 u2 K: a9 M0 LStandard: IEC 61558-1/1997
: U: {" [8 A6 m+ B& Q4 lA1/1998
% \9 s4 d4 ~1 D t$ uSub clause: 3.1.9.1' u2 j* W9 N9 P& `% h c4 {
3.1.11, s1 E5 W& E: t- p# t3 y0 D, h" p% @. H
15.3 – 15.5 – 27.3
9 Y% E! F( q8 o( CSheet N°: 589/06
' M2 A4 v5 o. ~) q! [Page: 1 (1)
8 K! Y y: b+ o% U% x5 H9 oSubject: Heat and fire protection
5 [/ n& C, F5 C2 ?% `# Y+ u& CKey words:4 W! \3 H9 u+ ~: q& U( k e
- Non-inherently short7 U6 I: F4 e- U* ~! A0 ~
circuit: x# U0 t D3 R" M
- Proof transformer( K* S5 q: I6 ]5 A
- Fail-safe transform.; t7 D( _4 e* Z
Meeting:
! Q' U5 c9 }% h1 tDecision confirmed
# {/ e: `$ Y# f( hat 44th CTL meeting9 x5 ~% f/ d1 F! X( Q
Question: Can a small built-in transformer with integrated thermal cut-out (not
0 J _- j5 |# ~replaceable) be considered as non-inherently short circuit proof transformer
# z5 u. T6 D3 [ u' |4 u+ |) b(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be
* M( t1 P" f$ c0 ~' l- pdone according to 15.3 and 15.5? Both tests are to be performed on separate% j- A( g9 p* _& J) l* G8 o
models.
6 P) E+ q6 {) ~Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal& I) K: y+ Z8 j! V( J
link is used in the input circuit. It doesn’t matter whether the input circuit is; t& Z$ y; @& _' x1 ]4 P) N+ f% e( S
interrupted by the transformer itself or by a built-in thermal link that is not
# ~4 w/ W! Q0 Rreplaceable.1 \& U! X" c* m4 o* w4 W8 V
3 E5 m, M; V- J# x& ~ v/ s5 _
6 _% q7 C' S7 A. m3 D" O: f/ q1 N3 e3 A% T& h
0 z9 B! k7 i/ |$ F6 K* c |
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