; t3 G, y: L; x6 l! [/ n9 Y3 vStandard: IEC60335-1:1991, 3rd Ed. " U3 x# F) ]8 n& x' |* g) `Sub clause: 19.11.2: e+ K! m+ J7 R$ o8 F2 e
Sheet n°: DSH-441A * L# l( ^6 z% j& l& R8 gSubject: Sheathed Heating Elements ) I- m/ O& N8 W# J5 r# HKey words: - Abnormal, sheathed element - Protective electronic circuit' b: P8 a0 o4 \, E. t3 l
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005) h4 r( y9 F6 k! E
Question: Some appliances have the following circuit , \' f( [) [! F$ y* s: d/ DIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with 2 u. T6 g4 n) {2 O8 `5 Sclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as$ k1 n1 [: U% I9 Q: I: C
in a) through f) of cl.19.11.2 % M; R& M- R! BIn our opinion (VDE), an additional mechanical thermal cut-out is required.7 O9 O/ z e7 V" |6 Z1 _
Convenors note:3 d, P3 }- J& L; G" S
In clause 19.5, the electronic thermostat will operate to limit the temperature in one9 [% T2 J5 @/ K+ T7 ]% v
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an0 _3 n' U! O7 s8 K" f
additional cut out required to comply with 19.5" v! k4 i1 h7 _: C2 c# [' ?7 a/ K. K
Decision: 1 v" E% D% q, M( {( U6 Y; lAn additional thermal cut-out is required - i, n9 u' U9 B* n$ p3 Z9 j) hNote: This is only applicable to the above mentioned standards and is not applicable to # ?1 |+ p) w% y5 I4 S6 h% dIEC60335-1(4th Ed. with Amendment 1).+ y# ?+ ]" a7 O
[attach]75937[/attach] " e, k8 f, _2 |, L + K4 U, i) `1 ~* N7 A+ T; N `
DSH 441A7 M2 o' f' v2 n6 L2 |