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|  DSH 589/06( i9 o; X1 a9 I% x* S
+ B/ R1 `5 `& x
| Heat and fire protection! Q% \ O' `, Y: S( b3 i2 M
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.30 n' g, u/ ?0 C+ {# P
| 61558-1(ed.1);am1& }' ]/ e# J) w, s; T' S. ~" b: @" U
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Standard: IEC 61558-1/1997
. q+ H" Z3 y- l [+ d" |A1/19985 }" I' l: P5 o) J- @
Sub clause: 3.1.9.1
* C0 ]% R l4 Z; v* |! Y' |: i3.1.11
5 p" ~4 f: v% ~( k5 f3 u1 V$ ~15.3 – 15.5 – 27.3
. p$ K3 ^( Z7 h- @2 ]% O* {! ESheet N°: 589/06
2 |' H. n; G4 V* gPage: 1 (1)
8 M+ }/ Q, ]/ d/ N9 s4 eSubject: Heat and fire protection
* e7 c t5 ^, V4 PKey words:* e+ S% D0 E3 A$ e1 j# u
- Non-inherently short& D6 Z- ~: h3 D2 w
circuit- N: `( {' u* P& c
- Proof transformer5 s5 G! h7 R: C) q1 W; |) h o4 y
- Fail-safe transform.7 R# b; z! K5 ~, s
Meeting:2 H/ w( Y& N! Q5 j* s" n* C
Decision confirmed
i# r/ c& ^* T' X" u4 hat 44th CTL meeting" j; u& l5 h# b
Question: Can a small built-in transformer with integrated thermal cut-out (not
z* \! X; |' T9 E1 l( preplaceable) be considered as non-inherently short circuit proof transformer% O$ g. b& _7 r
(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be7 D' j6 W" i7 g" k! _
done according to 15.3 and 15.5? Both tests are to be performed on separate& y. d. L" K! i7 S
models.
1 ^4 g3 E6 x- m# zDecision: Yes, such transformers can be considered as fail-safe transformers if a thermal7 r( q5 O7 b2 q
link is used in the input circuit. It doesn’t matter whether the input circuit is
6 g: h& J0 n) g1 C. S: X' h) f1 |interrupted by the transformer itself or by a built-in thermal link that is not
. O; ]1 o8 N5 K Vreplaceable.
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