DSH 441A Sheathed Heating Elements

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DSH 441A * ?: Z9 u0 `3 z7 y) V+ [

Sheathed Heating Elements ; m$ V( _- N- W9 @* u! Q( U

19.11.2

60335-1(ed.3) 8 ^9 Q! k; L  V1 ^

2 ?! m0 ~0 r( E2 E  x, OStandard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
Sheet n°: DSH-441A
2 J& U2 J: j. r& C# {1 [Subject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
$ K. G( `# b6 Z6 D" CQuestion: Some appliances have the following circuit
) o) A7 i  {' B& J) l" M9 @In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
clause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
in a) through f) of cl.19.11.2
' B) f6 K' S. U& l- y. ~In our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
. j& P( n2 b; y( }. M) D# d* i; xIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
additional cut out required to comply with 19.5
; Z+ g! n2 g, O! ]+ }# j/ n8 WDecision:
7 g/ A0 v2 z: a) D/ M6 cAn additional thermal cut-out is required
9 B3 d4 `4 g/ ?; o' j9 G: WNote: This is only applicable to the above mentioned standards and is not applicable to
5 B. a* b! X* U4 R+ J- Y# C3 fIEC60335-1(4th Ed. with Amendment 1).
. u( C: L3 t, U  n9 t3 I