DSH 441A Sheathed Heating Elements

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DSH 441A

Sheathed Heating Elements ! z6 K9 r8 s1 U1 U+ ^8 |

19.11.2 , _, ^% T8 z8 [

60335-1(ed.3) . L4 ~3 E; V/ j% n! g0 v: Q# r0 {

Standard: IEC60335-1:1991, 3rd Ed.
$ y: m7 I+ M" [1 z* A: }Sub clause: 19.11.2
. V; u& x+ _8 P) ]) uSheet n°: DSH-441A
4 {8 V  Q# X; i/ n& ^4 F+ R" SSubject: Sheathed Heating Elements
; Z; O$ }. |3 O0 s3 Z: W5 y, O4 p8 cKey words: - Abnormal, sheathed element   - Protective electronic circuit
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
& C, Y8 I! q- L. L2 W& H5 GQuestion: Some appliances have the following circuit
. C5 k; D3 k( W: @- WIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
* W1 q& J, B& Z+ d9 x" U7 Oclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
# I0 Z8 N/ S8 Y) d4 e5 p8 q7 f- h: Uin a) through f) of cl.19.11.2
In our opinion (VDE), an additional mechanical thermal cut-out is required.
& l1 ?7 L; |1 I. N  C+ k' R- P- MConvenors note:
/ s& w& D  i; T  h+ N8 gIn 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
& s- U) }0 f+ MDecision:
% g+ d9 e  l% l6 j/ RAn additional thermal cut-out is required
/ x1 ^( e. v& L, x/ w: @! E" [Note: This is only applicable to the above mentioned standards and is not applicable to
IEC60335-1(4th Ed. with Amendment 1).
1 P2 t- a; `$ e0 P% ]  j

; B8 {8 O. g) v% \9 \/ [