DSH 441A Sheathed Heating Elements

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DSH 441A % x6 d# m9 _; i9 s) K3 ?: c% L , H4 h0 [% T6 X  ^

Sheathed Heating Elements

19.11.2 ) o1 v$ S+ y1 [& ?/ }2 K! m" G( x

60335-1(ed.3)

6 r1 f- l2 i% l+ M# @4 Y2 ~Standard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
Sheet n°: DSH-441A
Subject: Sheathed Heating Elements
! S0 Z" ]( Y7 H- Q7 |3 {, GKey words: - Abnormal, sheathed element   - Protective electronic circuit
Decision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
( a  s) j* }# w2 e: h: m; M9 o" K+ ^Question: Some appliances have the following circuit
! y; A5 E0 k; H% ~. G3 W" L4 q' UIn Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
- a' _  V2 R2 H4 G! M! Z+ T2 @9 @" Pclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
3 k. l, R# K3 M5 L0 b; l. fin a) through f) of cl.19.11.2
In our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
( ^: p( @: W# C+ ~In clause 19.5, the electronic thermostat will operate to limit the temperature in one
9 ]: u5 f9 V* J' ]7 F, d/ ?configuration. The enquiry asks, if a single fault prevents the thermostat operation, is an
' \' }) z+ D- m5 V3 Hadditional cut out required to comply with 19.5
Decision:
An additional thermal cut-out is required
. K2 C- ]( I$ Y: P- }Note: This is only applicable to the above mentioned standards and is not applicable to
% X9 V) U& l! P: zIEC60335-1(4th Ed. with Amendment 1).
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5 Z* z) f& ^; [* ]5 q1 `* d
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