DSH 441A Sheathed Heating Elements

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DSH 441A

Sheathed Heating Elements 6 ^' N, C) p# O  P; k

19.11.2

60335-1(ed.3)

* }; W2 `8 ~+ c2 G+ L2 G* zStandard: IEC60335-1:1991, 3rd Ed.
Sub clause: 19.11.2
2 a- R% s! J3 W- ^& n: Z& j: uSheet n°: DSH-441A
5 ?3 L5 n& ?; BSubject: Sheathed Heating Elements
Key words: - Abnormal, sheathed element   - Protective electronic circuit
2 G! X' d) u3 |" u3 V7 cDecision taken during the 41st CTL meeting 2004 and modified at the 42nd CTL meeting 2005
: t0 X1 G" G0 T1 }6 x3 h' ]Question: Some appliances have the following circuit
In Clause 19.11.2, it is stated that, if an electronic circuit operates to ensure compliance with
/ T! P2 _4 \6 o6 m+ g# vclause 19, the relevant tests of clause 19 should be repeated with a single fault simulated as
* y1 ^$ s# H1 _2 R5 Oin a) through f) of cl.19.11.2
9 F; }& H+ O2 g+ {% g* O4 O' U' X: gIn our opinion (VDE), an additional mechanical thermal cut-out is required.
Convenors note:
7 `# T0 j1 s  u6 s3 \& ZIn clause 19.5, the electronic thermostat will operate to limit the temperature in one
5 ^/ ]0 k: B' X& iconfiguration. The enquiry asks, if a single fault prevents the thermostat operation, is an
" Z; [& ~3 D% h5 {. ^8 V0 q5 qadditional cut out required to comply with 19.5
Decision:
An additional thermal cut-out is required
9 ~6 F! r8 `, _Note: This is only applicable to the above mentioned standards and is not applicable to
( x3 F0 u' A( w/ dIEC60335-1(4th Ed. with Amendment 1).